What do I do with Mac Pro desktop fans running without extra heat?
My Mac Pro desktop has begun running the fans without the computer being hot or even warm. Is it a hardware fix? I tried shutting down and unpluging for 15 sec. to reset the SMC. No help.
Pushed power button before removing power cord for 15 sec. restart
I should have said, but felt it clear enough... Hit power button WHILE or AFTER UNPLUGGED and before connecting power again.
Apple has changed and rewritten its "How To" article at least 4-5 times just for the Mac Pro section in the last 7.5 yrs.
Resetting the System Management Controller (SMC)
https://support.apple.com/kb/HT3964
Using the reset button on a motherboard is always an option and was in the first set of directions, with arrow pointing to the exact button and its location back in 2006-7.
Just unplugging is... not effective, and hitting power button while unplugged, helps, some.
Similar Messages
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Airport Extreme base station no longer playing nice with Mac Pro
This is a strange problem...
I have an Airport Extreme base station (purchased in 2004) that I use with verizon DSL to get a wireless network going in my house, and I connect three computers wirelessly.
I have an ipod touch and toshiba PC laptop that are both able to connect to the network and run just fine. But lately (past 2 weeks or so) when I try to connect with my MacPro desktop I can go to a few sites, but after a few minutes the airport locks up. At that point none of my computers will connect and I have to unplug and then replug the airport. At that point the network will start up again and if I do not try to get on with Mac Pro then things run fine, but when I try to connect with desktop again, after another few minutes the same thing happens.
I know the problem is with the airport and my Mac Pro - I have done numerous connection experiments and have narrowed the problem down to that.
Is it possible that my MacPro might be drawing more power and causing the airport to overheat? (it is rather hot in the room with DSL connection)
Or should I accept that the current base it old, and bite the bullet and get a new base?
Any thoughts?Could you post what you did in order to resolve the issue. I'm having a problem with the base station in that I cannot connect to the internet with my laptops (a mac and pc) while I can connect wirelessly to my network with my desktop (G4). The base station is not detected in the base statin admin utility or the aiport setup utility. If anyone else has a solution I would be much obliged to read it.
Thanks! -
Mac Pro (2014) fan runs constantly
That is correct. Very astute observation.
¿Do you have any problems with your Mac that Readers could help you with? -
Hi All,
I'm trying to resume regular scheduled Full backup ( ~ 1 TB ) of drives using external HD (to allow off-site redundant backup storage) .
What are relative speeds of USB vs. Firewire vs. eSATA ?
I suspect eSATA connection may be considerably faster … how to install eSATA on mid-2010 Mac Pro desktop ( dual hex-core processors)?
( The quicker and easier backup protocol is, the more likely one is to use it to backup on a routine repetitive basis.)
ThanksJim Bogy wrote:
...I suspect eSATA connection may be considerably faster … how to install eSATA on mid-2010 Mac Pro desktop ( dual hex-core processors)?
( The quicker and easier backup protocol is, the more likely one is to use it to backup on a routine repetitive basis.)
Adding a USB 3.0+eSATA PCIe card, which The hatter mentions, is the best solution that I've found. See http://eshop.macsales.com/item/CalDigit/FASTA6GU3/. The card is not cheap, but the USB 3.0 works flawlessly (which can't be assumed; ask me how I know) and the eSATA connection allows booting from the connected drive. Grant Bennet-Alder's point about HD speed is important to consider; in addition, the size of the individual files being backed up and where on the backup disk they're going will affect overall transfer speed. For example, using the USB 3.0 connection on that CalDigit card going to a Toshiba 3TB external, the transfer rate for a big file (say a virtual machine file) from an internal SSD boot drive was about 145 MB/sec while a bunch of little files might drop to 30 MB/sec and both rates decrease as an inner partition on the external is used. All told, a nearly 700 GB backup took under 1.5 hours. Using a HD as the source added almost an extra hour, though a WD external was used for that. Using a WD green drive plugged into this http://eshop.macsales.com/item/NewerTech/FWU3ES2HDK/ with an eSATA connection took about 2.5 hours also, but that was bootable whereas the USB 3.0 connection is not.
Another point to consider is that USB 3.0 is ubiquitous on PC's now so there's lots of price competition for externals; not so much for eSATA externals. -
Where and what type of solid state drive should I buy for my early 2008 Mac Pro Desktop??
where can I buy and what type of solid state drive should I use to upgrade my early 2008 Mac Pro Desktop??
Rick,
When you get a chance.... DSLReports is off line: their SQL server decided to take its indexes and access to data. Power. Not enough of the right kind of UPS. Same happened to StorageReview's "Drive Reliability Database" about 8-9 yrs ago.
dslreports.com is offline
Fri Apr 20 09:05:55 EDT 2012
SSD: Loading CS5 plus other little monsters might matter.
Lots of small I/Os
latency of 1/100th where nanoseconds replace those "long" milliseconds
System: Small and fast.
DLLoyd even goes for short-stroking drives to get and maintain highest I/O
The new 10k VRs hit 200MB/sec - I still use them and still find them useful, long lasting, feel responsive with whatever I ask of them. I know they get criticized and "cost too much"
Just bought a new WD Black and yes it is better than the 2008 model I was using.
600GB 10K $200 vs $150-220 for WD Black. your choice
I can destroy a 7.2k drive, I have brought ever 10K drive back after a simple WD Extended Test in Lifeguard.
I don't really care about $$/GB or I wouldn't have just bought Intel 128GB $149
Database: the pros put the index in memory and page fix (virtual volumes in memory; cache; hold disk drive index in memory). Caching storage has been around for almost 40 yrs.
Today you can use SSDs as front end cache to hold DB indexes and frequent data for web servers and such adn use slower secondary storage.
SSD + SAS + 4TB storage
Separating the system from data: #1 must
Having data on array: been what I use
I put a large photo library on 2 x 10K VRs vs SSD and couldn't tell much difference (SSD is soundless of course) But my WD Blacks make as much noise and run 15*C hotter than those 10K (not what you expect?)
While 10K and 7.2K are in the 140-180MB/sec range, they are in 3.0 to 12.0 ms seeks, not 0.01 ms.
People wonnder why shrink a drive to 2.5" (or why not go down to 1.8".
How long does it take to reposition a disk head? how often? the 10K VR travels on outer tracks at 70 MPH. Really trying to fly off into space.
It uses one step to find the "zip code" and then another DSP to find the "house."
True of any high density perpendicular recording mechanism.
And of course while the Raptor-X tried to find a home with famers, Cheetah buyers, the WD 10K line has more of a home where servers and small form factor drives - and 100s of them - can fit in a rackmount server I imagine.
Anyway.... if SR and DSLReports can drop out of site due to power and hardware failure and loss... we can learn some and hope to protect our own data and investments. -
ghlighting a file and then moving cursor over a file lower in the list, and pressing shift-control-click. I can't do that in now with Mac Pro. What am I doing wrong?
Holding down the control key will invoke "right-click."
Depending on the View, holding down Shift will with either toggle the selection (Icon View), or it will make a continuous selection from the previous selection (List View or Column View).
The only way to make a continuous selection in Icon View is to drag out a selection marquee around or through the icons.
I can't remember the behavior of previous OS's. -
HELP! Mac Pro Desktop... Can/Should I run with my NEC 2070NX LCD?
My main reason for considering a MAC is my photography work, my peers tell me to go this route (Mac). I currently run Adobe Photoshop CS2 on a PC and HP Laptop.
I have been considering buying an iMAC 20" OR 24".. now the MAC PRO Desktop! Still undecided! Comments & Suggestions greatly appreciated!
I am leaning towards the MAC PRO Desktop purchase, pretty much base unit for now Dual 2.66, 250 HD, 256 Graphics, etc.
I am thinking if using my existing NEC LCD with the Mac Pro Desktop... Can I run with my NEC 2070NX LCD?
I bought the NEC about 2 months ago.. highly recommended for photo use due to the LCD Panel being an S-IPS type, much better than TFT as I hear!
NEC 2070NX Review:
http://www.macworld.com/2005/06/reviews/neclcd2070nx/index.php
Product Site:
http://www.necdisplay.com/products/ProductDetail.cfm?Product=399&ClassificationF amily=1&Classification=1&ProductGroup=LCD
CAN YOU OFFER ANY HELP, COMMENTS OR SUGGESTIONS???
Thank You!
Sincerely,
Edmund
Mac Pro Desktop (to be) Mac OS X (10.4) Current PC guy, to be first time MAC!I loathe Windows and have been a Mac user since the Apple II+ so far be it from me to discourage anyone from switching...but....Photoshop is not yet a Universal Binary which means it doesn't run natively on the Mac Intel line. If you have a good, fast windows machine now, moving to a mac will be a downgradein speed. Overall it may be a win if you are experiencing crashing, have problems with viruses or have other issues, but if you have a fast, stable PC running Photoshop that is working well for you the lesser speed of PS on a Mac is something to be aware of. Your monitor is no concern or problem. A base unit purchase, however, is. The base 1gig of ram is insufficient for all but the most casual user of a MacPro and it is wholly insufficient for a heavy Photoshop user because Photoshop needs RAM and so does Rosetta in order to run Photoshop in emulation on the Intel board. (don't bother nitpicking if emulation isn't the exact term ) Three megs of RAM is, IMHO, your base configuration, and if you want to use Aperture, the ATI card becomes part of the base configuration too. But...the MacPRo wants memory in pairs and three gigs, it turns out, handicaps the speed of the machine a bit...so while three gigs is a "base" (again...IMHO) for Photoshop, 4 gigs is my strong recommendation (which I followed personally).
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HT1338 I own the Mac Pro Desktop with the older OS X 10.5.8. Can I upgrade to a newer version?
I own the Mac Pro Desktop with the older OS X 10.5.8. Can I upgrade to a newer version? Will it affect my docs etc currently stored on hard drive's? How much will this cost?
If you have a 2006 or 2007 model you can upgrade it to Lion - 10.7.x. If it's a 2008 or later model you can upgrade to the current version of Mountain Lion. Doing so requires Snow Leopard 10.6.8:
Upgrade Paths to Snow Leopard, Lion, and/or Mountain Lion
You can upgrade to Mountain Lion from Lion or directly from Snow Leopard. Mountain Lion can be downloaded from the Mac App Store for $19.99. To access the App Store you must have Snow Leopard 10.6.6 or later installed.
Upgrading to Snow Leopard
You can purchase Snow Leopard through the Apple Store: Mac OS X 10.6 Snow Leopard — Apple Store (U.S.). The price is $19.99 plus tax. You will be sent physical media by mail after placing your order.
After you install Snow Leopard you will have to download and install the Mac OS X 10.6.8 Update Combo v1.1 to update Snow Leopard to 10.6.8 and give you access to the App Store. Access to the App Store enables you to download Mountain Lion if your computer meets the requirements.
Snow Leopard General Requirements
1. Mac computer with an Intel processor
2. 1GB of memory
3. 5GB of available disk space
4. DVD drive for installation
5. Some features require a compatible Internet service provider;
fees may apply.
6. Some features require Apple’s iCloud services; fees and
terms apply.
Upgrading to Lion
If your computer does not meet the requirements to install Mountain Lion, it may still meet the requirements to install Lion.
You can purchase Lion by contacting Customer Service: Contacting Apple for support and service — this includes international calling numbers. The cost is $19.99 (as it was before) plus tax. It's a download. You will get an email containing a redemption code that you then use at the Mac App Store to download Lion. Save a copy of that installer to your Downloads folder because the installer deletes itself at the end of the installation.
Lion System Requirements
1. Mac computer with an Intel Core 2 Duo, Core i3, Core i5, Core i7,
or Xeon processor
2. 2GB of memory
3. OS X v10.6.6 or later (v10.6.8 recommended)
4. 7GB of available space
5. Some features require an Apple ID; terms apply.
Upgrading to Mountain Lion
To upgrade to Mountain Lion you must have Snow Leopard 10.6.8 or Lion installed. Purchase and download Mountain Lion from the App Store. Sign in using your Apple ID. Mountain Lion is $19.99 plus tax. The file is quite large, over 4 GBs, so allow some time to download. It would be preferable to use Ethernet because it is nearly four times faster than wireless.
OS X Mountain Lion — System Requirements
Macs that can be upgraded to OS X Mountain Lion
1. iMac (Mid 2007 or newer) — Model Identifier 7,1 or later
2. MacBook (Late 2008 Aluminum, or Early 2009 or newer) —
Model Identifier 5,1 or later
3. MacBook Pro (Mid/Late 2007 or newer) — Model Identifier 3,1 or later
4. MacBook Air (Late 2008 or newer) — Model Identifier 2,1 or later
5. Mac mini (Early 2009 or newer) — Model Identifier 3,1 or later
6. Mac Pro (Early 2008 or newer) — Model Identifier 3,1 or later
7. Xserve (Early 2009) — Model Identifier 3,1 or later
To find the model identifier open System Profiler in the Utilities folder. It's displayed in the panel on the right.
Are my applications compatible?
See App Compatibility Table — RoaringApps.
For a complete How-To introduction from Apple see Upgrade to OS X Mountain Lion.
Back up your current system to an external drive or to an available internal drive by making a bootable clone:
Clone using Restore Option of Disk Utility
1. Open Disk Utility in the Utilities folder.
2. Select the destination volume from the left side list.
3. Click on the Restore tab in the DU main window.
4. Select the destination volume from the left side list and drag
it to the Destination entry field.
5. Select the source volume from the left side list and drag it to
the Source entry field.
6. Double-check you got it right, then click on the Restore button.
Destination means the external backup drive. Source means the internal startup drive. -
Air play mirroring doesn't work mac pro desktop 2010 mid 27" display
mac pro desktop 2010 mid '27" display'
I have turn on the " show mirroring options in the menu bar " it does not show up
I also have Imac workes just fine ,Iphone , Ipad , same workes just fine
so it is in the mac pro is there a down load fix or do I need to buy graphics card or what
I have had nothing but but troble out of this 27" display no microphone the misplay will stop working
when avery thing was new you told me that a fix would be out soon but 2 years later not a thingbe sure you are not confusing "AirPlay Mirroring" and Display Mirroring.
AirPlay Mirroring is not supported in that Model Mac, only in Macs with Intel integrated graphics:
About AirPlay Mirroring in OS X
Your Mac does support Mirroring of displays, and always has. The settings for this are in:
System Preferences > Displays ...
... [√] Mirror displays -
Wifi macbook and mac pro desktop
Hi, not sure if this is the right place to post this. I have a Macbook that can see my router and connect no problem. My Mac Pro desktop computer is far from the router and I want to connect wirelessly, but the Mac Pro can't see the router, even though it has an airport card and is right next to the Macbook. I'm not too wireless savvy — any help would be appreciated. Is it possible for the Macbook to share it's connection with the Mac Pro? I need a quick fix that doesn't involve running a network cable across the house...
Thanks!OK, so now you know the wireless card is working, or appears to be working because you can see other networks.
The next task is find out if it will connect to your network, and to do this, you'll need to move the desktop maybe half the distance to the router and see if you can get a connection.
If you can, the area where you had the desktop will need a stronger wireless signal. You don't mention what type of router you are using, so using an AirPort Express to extend the wireless signal can't be recommended..yet..since it may not be compatible with your router.
If you don't want to move the desktop and have to have a connection in the next few hours, get a pair of ethernet powerline adapters. This will be almost as good as a straight ethernet cable and far better than wireless. The adapters (one at the router end and the other at the computer end) use the wiring within your house to transport an ethernet signal.
Best Buy will have a selection or look under "ethernet powerline adapters" in google. -
USB superdrive not working with Mac Pro
Is there a trick to getting a USB Superdrive working with a Macpro?
The drive in the Macpro no longer ejects and have tried connecting the USB drive to both the front and back ports - does it not work with Mac Pros?
Any pointers in the right direction would be much appreciated.I had a problem my superdrive. It would play dvd's and cd's that were already burnt but would not burn blank DVDs or CDs- in the recent past it had no problems burning. In addition, the Finder would not display the superdrive. When I put a blank disc in it would go to Disk Utilities and would not allow burning. With help from Apple I discovered the problem-- The settings in CDS & DVDs had been changed from When you insert a blank DVD/CD "Ask what to do to to "GO to Disk Utilities". If this sounds like your problem try changing the settings to this:
Try going to; System Preferences/ CDs & DVDs
Change these two settings to this:
When you insert a blank CD: Ask what to do
When you insert a blank DVD: Ask what to do
NOTE: If they are already set to this you probably have a different problem. If they are set to Go to Disk Utilitiy this is probably a solution.
And
Then go to Finder Preferences
Make sure that under "Show these items on desktop:" that the checkbox for CDs, DVDs, and iPods is checked.
Try to burn the DVD again (reload Disc- perhaps restart) and try again.
Don't know how these setting changed but they did. It worked for me.
Message was edited by: pj176 -
My internal hard drive isn't being recognized on my macbook pro but when I put the HD in my Mac Pro (desktop), the desktop computer recognizes the HD. When I insert the installer CD on my laptop, it also doesn't recognize my hard drive. Please help! Thank you!
I've also been getting an image with the folder and question mark. I've tried everything on the apple support page but it doesn't seem to work either.Well, I tried all of your suggestions and they didn't work -- no surprise because I was trying to backup to my external c.d. disk. Duh! The application for the home is in the mail.
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My Mac Pro Desktop Shows no Sign of Life, Is it dead?
I have a 2009 Mac Pro Desktop 12 core 96 gig ram. It's a refurbished Mac. Anyways one night while on a website doing my homework the Mac froze up and I couldn't do anything, so I shut it down by holding the power button.
Next morning when I tried to turn it on it won't start up. Here are is what it is doing or not doing.
when I turn it on:
fan starts up and I can hear it but nothing happens
no chimes
any usb devices that are plugged into it won't get any electrical signal, mouse, keyboard, even iphone.
I've tried unplugging the power cord and plugging it back in after 1 minute and booting up again but same problem happens.
I am thinking it could be a failed logic board at this point, can anyone confirm?
I am a newbie at this and is my first time posting, so sorry if I left out any important information, I'd be happy to share any additional information if needed.fan starts up and I can hear it but nothing happens
Is the power-On light flashing in a deliberate pattern?
If so, your Mac is working, but not enough RAM is working properly to start up. -
Note regarding ATI X1900 XT with Mac Pro, Leopard
To all who are experiencing any of the frequently reported problems with the hardware/software combination listed in the subject heading:
I purchased the ATI X1900 XT as an upgrade fro my Mac Pro in January. I never experienced any issues with the card in OS X Tiger, but several months ago I began to experience overheating issues in Windows XP (Boot Camp) when playing graphics-intensive games. The overheating caused visible graphics corruption/artifacts, graphics system resets and even spontaneous system restarts. The frequency and severity of these symptoms actually increased over time, leading me to believe that the card was either defective or that the overheating was causing degenerative/cumulative damage to the graphics hardware.
I recently upgraded to OS X Leopard, and all **** broke loose. Immediately after upgrading, I began to experience frequent graphics corruption/artifacts (in the form of spurious horizontal lines), system lockups/freezes and spontaneous system restarts. None of these issues were present in Tiger. The system became completely unreliable and essentially unusable.
It was initially a popular belief that Leopard's graphics drivers were somehow buggy or incompatible with the X1900 XT. After my experiences, I don’t believe that’s the case. I think that the issues reported are symptomatic of hardware, not software problems. Leopard is merely a catalyst. Leopard's increased leverage of OpenGL stresses the graphics hardware in ways that Tiger did not, causing an overall increase in graphics hardware temperature. I believe that the glitches/artifacts/system freezes/restarts that I experienced were not due to buggy drivers, but due to the graphics card overheating as a result of the increased load placed on it by Leopard.
I brought my X1900 XT in to my local Apple store today and asked for a replacement. Fortunately, they had one in stock, and they gave me a new card on the spot. The technician was apparently well aware of the issues, and mentioned that they have had a lot of similar problems with new iMacs.
Since installing the new card, I have experienced no graphics corruption, system freezes or spontaneous system restarts, either in OS X Leopard or in Windows XP gaming.
I would urge anyone who is experiencing problems with the X1900 XT (in either Windows or OS X) to have their card replaced by Apple - assuming that their card or system is still under warranty, that is.
I suspect one of two possible scenarios is true:
Theory #1: The Rev 1 X1900 XT is inherently flawed and has problems with overheating, which is exacerbated in OS X by upgrading to Leopard. Due to Leopard's greater leveraging of OpenGL, there is increased thermal stress placed on the card relative to Tiger. The overheating is evident in Leopard as graphics corruption/artifacts, system lockups/freezes and spontaneous restarts. The Rev 2 X1900 XT has (theoretically) corrected the problems inherent in Rev 1.
Theory #2. The thermal management system of the X1900 XT (all revisions) is inherently flawed. The card will slowly cook itself over time, and the effects are degenerative and cumulative. As the age of the card increases, so will the occurrence of graphics corruption, system freezes and spontaneous system restarts, especially when playing graphics-intensive games or running OS X Leopard.
I sincerely hope that Theory #1 is the case. I’ll be watching my system closely as I continue to use the new card, and hopefully there will be no further problems with overheating.
If theory #2 turns out to be true, then Apple has a huge PR nightmare on its hands, as each X1900 XT for the Mac is essentially a ticking time bomb that will self-destruct within months of purchase.
The funny thing is, this isn’t the first time I’ve had graphics card trouble with one of Apple’s “professional” towers. I bought a G5 several years ago when they were first released. I had problems with the stock nVidia graphics card in the form of what came to be known as the dreaded “black screen of death.” This became a commonly reported issue, experienced by many owners of the G5 in its first revision. Apple replaced my card and the problem never reoccurred. I’m hoping that I’ll be as lucky this time around.
I think it’s apparent that Apple’s batting average with graphics cards isn’t exactly stellar. It’s curious, considering that Apple offers a very limited selection of graphics options for their towers. One would think that by Apple only offering 3 graphics options, they would be able to have fairly tight control over the quality of the hardware, and plenty of time and resources to devote to testing. Unfortunately, I’ve had more graphics hardware-related problems on my Macs than any PCs I’ve ever used. That’s embarrassing, and Apple needs to do much better than this.I replaced my G5 Quad with a Mac Pro 8-core. The Mac Pro's thermal design is far superior to the G5's. The G5 Quad's liquid cooling system has a much bigger task (IBM doesn't publish the thermal dissipation numbers on their PPCs but I suspect they are high) than the more efficient Intel Xeons. The G5 liquid cooling units are troublesome and the issue is something I think Apple is quietly solving by replacing failed liquid cooled G5's (that are still under warranty) with Mac Pros (a very smart PR move). My primary concern when I switched to a Mac Pro was issues with the X1900 XT graphics card failure rates posted on the web and in these discussions. The very latest generation of the X1900 XT (July 2007) are reported to be more reliable. Many G5 owners are still reporting failed cards. Given the much higher thermal environment and the remarks in this thread, I can now see why. The interior of a G5, especially Quad, gets too hot for this ATi card. I had the nVidia GeForce 7800 GT in my Quad. That was a very good card. Still, the issues with the ATi x1900 XT may indeed be a thermal design issue that AMD may need to either address directly, or turn to a 3rd party solution.
I installed a 3rd party cooling alternative, Arctic Cooling's Accelero S1. It's a passive system that replaces that hairdryer fan with a large heat sink. The package includes upgraded heat sinks for the power regulator (much beefier than the stock), and for each memory chip. The heat sink is a large conductive cooling assembly that uses 4 heat pipes. The vendor claims that using this system increases the case temperature by 1°C, which is easily handled by the system cooling system. So far, their claim appears to be valid. Since there's no longer a fan, you can imagine how quiet the system has become. The only installation hitch is that the black support clips were made for the PC version and the Mac Version adds a beefy support rail on the spine of the card. The workaround is to trim off the lower tang of the clips so they just rest against the support rail.
After reading this, I'm tempted to add the "Turbo" option, a couple of high volume low speed fans that fit on the radiator. I'm trying to "stress" the system by running SETI@Home 24/7 while doing all the other work to see how hot and how loud I can get this system. So far, no disappointments. This is the quietest workstation I've ever worked on. Even when "hot", the fans are not loud. The passive cooling system seems to work very well. I left Star Wars-Empire At War up and running in the menu for hours one day and it didn't seem to suffer from any ill effects. I have owned this system for just over a month. I will add more thermal load after I crank the system memory up to 24 or 32 GB. If there are any real cooling issues, I will find out about them next summer. I really dread the prospect of plunking down another $2k for the nVidia 4500 FX (I really don't need the 3D audio support) to get comparable video support. -
Can I safely plug a Mac Pro desktop, bought in America, into a UK socket?
My father bought a Mac Pro desktop from America and the cable to plug it to the electricity says 125 volts - can we plug it safely into a UK socket where the voltage is 250 volts without damaging the desktop computer, or, do we need to do something else first?
I would like to thank you in advance for any replies ofered as an answer to this question!Electrical and operating requirements
Line voltage: 100-120V AC or 200-240V AC (wide-range power supply input voltage)
Frequency: 50Hz to 60Hz single phase
Current: Maximum of 12A (low-voltage range) or 5A (high-voltage range)
Operating temperature: 50° to 95° F (10° to 35° C)
Storage temperature: -40° to 116° F (-40° to 47° C)
Relative humidity: 5% to 95% noncondensing
Maximum operating altitude: 10,000 feet
from:
Mac Pro (Mid 2010) - Technical Specifications
So, it appears that No Transformer is required for this model for UK power (240V AC 50 Hz).
In the long run, you may want to purchase a local Power cord (rather than running with a plug spliced onto the USA AC-power cord). Be sure to connect the Earth Ground for safe and reliable operation.
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