MDD dual 1.25 CPU DEAD- WHICH MOTHERBOARDS had COMPATIBLE CPU's?

I've just finished (after much help from Japamac, Grant Bennet and others) diagnosing what's wrong with my MDD.
*FRIED CPU.*
My Logic board is marked 820-1476-A. I found a good used dual 1.25 CPU pulled from a MDD motherboard that's labelled (the motherboard is labelled) 820-1472-A.
ANYONE know if the motherboards are compatible, i.e. if a cpu pulled from that motherboard will run on my motherboard?
If noone knows, any ideas where I could find that info?
From my research so far, some MDD motherboards with nearly similar numbers CAN interchange CPU's, others cannot.
ANY help appreciated, especially now that I've got the issue isolated.
Tom

mddthing wrote:
Have you isolated why the processors fried in the first place?
If its heat I would advise the dual 1.42GHz heatsink and using arctic silver paste...
Ah yes... the question of the millennium. What caused the first snowflake to fall...
The fans are all fine.
Here's the sequence of events:
I was experiencing a series of system corruptions & freezes forcing me to do hard shutdowns when this happened.
The only way to shut down a GUI freeze that I know of is to hard shut down (not good).
The day the full cascade happened, I'd just finished my *8th or 9th hard shutdown.*
I was trying to reboot from another partition on another disk that wasn't corrupted & repair the startup volume.
+*That's when I got a steady pitched tone upon restart. I had no idea what it meant.*+
+*After two more freezes the computer wouldn't startup at all.*+
My insurance would pay only IF I took it to a tech center, and they said "bad power supply, get another computer. It's not worth it."
I did end up get a used G5 but began to attempt a repair... I NEED a MDD for my music interface cards, circa 2000, which after my G5 purchase discovered that none of the cards work. That's my entire music interface; A MOTU 1208 with a 5 volt PCI card required to use it, and and "ADAT edit" card (same era).
The new G4 PSU (and a new power switch) got something happening, but I discovered that one of 2 seagate drives in the "front" cage was dead (only 1 year old).
Long story short, seagate sent me a new drive and, in researching the problem, I learned (*from seagate*) that their PATA barracuda drives run *really really hot.* I had TWO in the front cage, and two "pre-seagate" maxtor drives in the rear "wall cage".
*My estimation is that it WAS a heat problem, in one way or another that caused everything.*
I do music and drive the system pretty hard. There was thermal compound on the processors, but I wasn't the original owner, so I also have no idea if it was applied sufficiently, or how the computer was treated before I got it.
My concern is that the motherboard may have taken a hit as well, since when I first examined the CPU I didn't see the "black dot" I saw after attempting a startup with the new PSU. It *did start once, ran for 5 minutes and that's when I think the CPU shorted.*
Although (with the new PSU), even after that, all the fans run and the red light comes on, just no startup chime. Other than that I have no test equipment. Also running out of money.
I'm probably going to try and get a new processor I saw ($114), use only ONE drive in the front cage, get some ice goop, and hope the motherboard survived. Simply can't swing $250 for a used MDD, so I'm trying the processor swap... first.
I'm also going to find a way to install another small fan in the front cage blowing directly at the heat sink, and cross my fingers... *if I get that far*.
The fans always cycled up and down when needed, so the system WAS recognizing heat conditions.
I'm also thinking of drilling open the "cheese grater fake-holes" and setting the tower up off the floor for better air flow in general.
The heat sinks all seem to have totally different attachment methods.
Mine has 5 screws and uses a Rube Goldberg wiggy looking flange on the front.
+*I didn't know you could swap for the "copper tube" heat sink. I assumed the the 1.47 motherboard had different attachment points.*+
+*This is news to me. CAN I?*+
My sense is that something in the original "cascade failure" caused one of the 2 processors to fail. But I'm just guessing. Can't be sure until I replace it.
+*...God I love being broke...*+

Similar Messages

Best Video Card for my MDD Dual 1.25 and Video Editing?

I know that this has been discussed several times before. I just never saw any real answers. I was planning to a little more intensive video editing so I got the Motion 2.1 Trial. Well, doens't allow me to install saying that my video card doesn't meet the specs. I'm confused, I read the requirements and read me files and my ATI Radeon 9800 Pro seems to meet the basic requirements. However, the About this Mac says that it doens't support Core Image.
I guess my question is what would be my best and least expensive video card upgrade? Or is mine set up incorrectly or something? I've read elsewhere that this card should work. I'm just a little confused why it doesn't support Core Image....I may go all the way to Final Cut...Will this card work with that application?
Any info would be great.
Thanks.
Robert

Thanks and sorry for the confusion...I just realized
that mine is only a 64mb card. It's the stock that
came originally in the MDD dual 1.25 I believe. I
had no idea that the same model card can have
different amounts of memory. It still says that it's
the ATI Radeon 9800 Pro...just 64mb and no core image
support
It sounds like you may be mistaken and have an Apple OEM ATI RADEON 9000 Pro. That had 64MB, was stock with the MDD, and does not support core image.
There was also an Apple OEM ATI RADEON 9700 Pro with 128MB available as a BTO option with the MDD Dual 1.42GHz. Sometimes they pop up on eBay, although they are sought-after because they support core image and have both an ACD and DVI connection allowing for two digitally-connected LCD flat-panel monitors.
To my knowledge there have only been 128MB and 256MB versions of the ATI RADEON 9800 Pro Mac Edition.
PowerMac G4 MDD Dual 1.25GHz Mac OS X (10.4.10)

MDD Dual 867MHz CPU Overheating

MDD Dual 867MHz CPU Overheating
I have noted the large number of problems with this particular model and heat issues, but I just received this stripped MDD to do an upgrade on the cheap for my B&W G3 server. In hindsight this might not have been the best unit to upgrade with, but for $72 on ebay (seller was unsure it was dual processor--which may have helped lack of bidding), I figured it was worth it.
After putting RAM to 2GB, putting in an ATI 9200 PCI graphics card, and inserting my HDs from the B&W with updated Tiger installed, everything booted fine with no problems. Dual processors checked out, RAM was fine, and all drives loaded without glitch.
Next go round, after 20-30 minutes it does the sleep/freeze thing everyone has mentioned here and elsewhere. All fans work and have tested with door open and high speed fan directly over heat sink and it still shuts down. Temperature Monitor has it rising above 80c and climbing, which I no longer let go until "closing" to avoid any more damage.
The weird thing about this is that during all of this, the aluminum heat sink remains relatively cool, as if it is not making any contact.
Is it possible it just needs a pad or compound to make contact and dissipate the heat through the sink etc., or does this sound like either a faulty sensor or failing CPU? The compound would be an easy fix (and it sounds logical), but I may just be missing the obvious here. My hope is that the prior owner just did not bother to find out why it did this and cannibalized the unit.
I could take out all the drives, etc. to reduce the heat build up, but I want this to function as a feasible house server that can be left on most of the time + because of the cool heat sink the behavior does not seem to relate to the heat in the housing.
Any and all help will be most welcome.

I think you've nailed it there. Definitely sounds like a poor contact between the CPU and the heat sink.
The sinks do get quite warm, and the CPU seems to low about 52 C, average 59.5 C when busy and top out at 62 C.
It's a great machine, so if you can lay your hands on some thermite glue and effect the repair, you'll be on to a winner. $72, you lucky so-and-so.

Which sata card will WORK! with a Mac G4 MDD Dual 1gb

I have a G4 dual 1gb and the OS is 10.4.11.
I want to put a sata card that will WORK, in this machine. I have tried an Acard 6293m, and it showed in the system profiler, but I couldn't see the hard drive. Is there ANYONE who has been successful with any sata card in this machine? Booting would be great but not necessary.
Any help is greatly appreciated!!

You're very welcome. The SATA/Raptor install made probably the biggest difference in performance of the many upgrades I have made to the MDD. The difference, while never quantified, was tremendously apparent on boot times and on apps (loaded on that drive) opening. I would not hesitate to make that investment again.
For what it's worth, as a frame of reference I bought the MDD second hand. Prior to that I had been using a QS933 since new. I was disappointed at the time I got the MDD in what I perceived as a performance difference (or lack thereof) between the QS933 and the MDD's Dual 1.25's. That upgrade was not as noticeable, to me, as was the SATA/Raptor combo. It was a couple hundred bucks well spent.

Dual 1.25 CPU replacing a dual 1ghz

Hi!
Is there somebody who knows if I can replaced the dual 1Ghz CPU (MDD model) by a dual 1.25Ghz CPU (from an other computer that has a dead MDD computer motherboard).
Would it be a direct replacement ?
Thanks

Hi!
Is there somebody who knows if I can replaced the dual 1Ghz CPU (MDD model) by a dual 1.25Ghz CPU (from an other computer that has a dead MDD computer motherboard).
Would it be a direct replacement ?
Thanks

ATI X800 XT 512MB on MDD dual boot dual 1.25Ghz.... possible?

Hi,
Just looking to see if I can install a Mac version of the ATI X800 XT 512MB on G4 MDD dual boot dual 1.25Ghz machine?
If so... great... I'll go pick it up straight away.
thanks
PS. I know it won't accelerate 9.2.2, but I already have the 9200 PCI card to accomodate that.

Just following up on japamac's excellent response.
ADC presents a seriously limitation on cards since the only two retail cards (no flashing, no fuss) on the market are the ATI 9600 and 9800, both without ADC.
I use a modified 9600 Pro from a G5, which has an unpowered ADC. Unpowered because the the ADC tab doesn't align, although some people have modified the card further to get power to the ADC port. For info on both of those mods, see:
http://www.pistolerapost2.com/viewing/96002g4.html
There is one last card -- extremely -- I can think of with ADC and more oomph than the retail 9600: the Apple OEM 9700. That was a BTO option for the MDD. Here's some info on that card:
http://www.xlr8yourmac.com/Graphics/Radeon9700PROOEM/index.html
Again it's really rare because it wasn't available even as a BTO option for very long. They fetch a premium on the used market when you find them.
What ADC monitor do you have? I hope an LCD. In which case, something to consider is the Apple ADC-DVI adapter which will set you back $100. It's basically a kind of splitter, with a brink supplying power to ADC monitor while passing the signal from the DVI port. Yeah this adds to your costs, but gives you more options in terms of cards.
Oh more thing about 9.x acceleration which you mentioned. With ATI cards, you might need to pull an extension or library from the Extensions folder to keep 9.x from stalling at boot. I had to do that with my 9600. Sorry, I'm on my MBP now, so I can't tell you which ones. Let me know if you need/want to know which ones I pulled.

Extra cooling needed for G4 MDD Dual 1.25 w/Radeon 9800?

I'm juggling graphics cards in my G4s. Some months back, I received a G4 MDD Dual 1.25 with a Radeon 9000. I migrated all my stuff from my G4 Digital Audio over to that, including my GeForce 4Ti card, and after some downloading of drivers, I was able to get the G4 DA running with the 9000.
A short time ago, I recieved a G4 MDD Dual 1.0 Ghz with a Radeon 9800 Pro 128M card (that's what the label says, anyway...). Two things were a little different, and they are what prompt my question. First, one of the PCI slot "covers" had been removed. This could simply be that the preior owner removed a card they needed for something else, of course. And second, there was rather a lot of foam (like for chair cushions) stuffed in places. I'm thinking that was to quiet the machine down.
So anyway, if I move the 9800 into my dual 1.25, will I need to "help" the cooling in any way? I'm thinking not, but since I've never dealt with these cards before, then perhaps there is common knowledge out there I'm unaware of.
Then, I'll have a G4/DA with 1/2Ghz Sonett processor & GeForce 4Ti, and a G4 MDD Dual 1.0 Ghz with Radeon 9000 to move on to new owners...

The Radeon 9800 is a warm card, but it isn't so terrible that the MDD can't use one.
The most important step for keeping the DP MDD cool is to enable Nap mode using CHUD:
567DFEE3-A0A8-4602-9722-FCFCD76D8837.html
Another important task is to replace the thermal compound on the Radeon 9800.
The cards are all older than the thermal compound was meant to last.
16196A0F-952B-47ED-A9F9-91F7B0ECA431.html
and
C874D84E-96DD-4DFF-9566-7C66BE065BB5.html
Use Arctic Cooling MX-4.
Also use it on the processors to get additional cooling benefits.
Use of Nap mode and replacement of the thermal compound should be all that is required to avoid heat issues.
The following are all additional cooling ideas to consider.
The mention of a PCI cooler is a good one. Placed along side the Radeon, it can help to rid the case of hot air produced by the graphics card.
This one is good help with minimum noise:
http://www.xoxide.com/thermaltake-cyclo-blue-slotcooler.html
The Radeon 9800 has a minimalist fan and heatsink.
The aluminum heatsink doesn't disipate heat as fast as copper, and the fans tend to bake out and fail.
Replacement with a third party cooler is a good idea, but the design of the MDD makes that difficult.
This little Vantec cooler is a good option for the 9800 in a MDD which has the memory slots filled:
http://www.vantecusa.com/en/product/view_detail/95
If the memory slots have two 1 GB DIMMs installed in the two slots furthest from the graphics card, then this cooler is fine:
http://www.vantecusa.com/en/product/view_detail/97

Adding ethernet card to MDD dual G4 1Ghz

Anyone know if the computer or PCI slots on the MDD dual g4 1ghz are finicky about which type or brand of Ethernet cards can by used? The onboard on is flaky and want to add one via an add-on PCI card.

Hi FM,
there are a few posts in this forum that talk about specific cards; but the truth is, the cards are cheap, plentiful, readily available, and mostly work. The most important part is making sure that the card manufacturer supplies drivers for OS X (and OS 9 if you need it).

Which motherboard do I have?

I just bought a refurbished MSI 865PE Neo2 -FIS2R from NewEgg.com and it came with no packaging at all. No cables, cd's, shield, manual.
I want to confirm which motherboard I got and if I should return it rather than waste my time trying to install it with my new P4 2.4 HT 800mhz CPU.
Here is what it says on stickers on the MB:
865PE Neo2
P/N: 6728-030
S/N: K0309068053
The board is purple.
Also, where can I get a face plate for this? THis board doesn't come with a Coaxial output RCA like it showed in the picture on NewEgg. One of the reasons Im asking.
Help is much appreciated.

Quote
Originally posted by StylinLP
Planning on using the Live Upater to get my BIOS up to date.
THanks
LIVEUPDATE
Download Bios and install...........

Upgrading my G4 MDD dual 867 with Gigadesigns dual 1.33 upgrade; worth it?

I am updgrading my PowerMac G4 dual 867 and doing most of the usual; ATI Radeon 9800 Pro 256MB AGP video card, more internal hard drives, still debating on SCSI hard drive; then maxing out memory at 2GB (missing anything else to upgrade?)
I am also considering on upgrading the processor to Gigadesigns dual 1.33 processor upgrade (btw, is this the only processor upgrade available for me?). First, is it worth it? Second, will this force me to change out my PC 2100 DDR SDRAM memory modules? Any other foreseen problems with upgrading to the dual 1.33 processor?
I am hoping to get a response from someone who has actually upgraded their MDD dual 867 with Gigadesigns processor and see what they have to say about it.

MDD upgrades were complex, challenging, and there are 6 different configurations and versions of MDDs out there. And the supply of 7455Bs may be a limiting factor.
If you need OS 9 or don't want a G5 (2.0's for $1699 making it affordable "upgrade") and $499 seems acceptable, and your applications will benefit, AND you don't need more than 2GB RAM (which is limiting also)...
The 9800 Radeon adds more heat and noise and $249 to costs, and the fan is loud but also can fail (poor designed product?).
yes for SATA 10K Raptor over SCSI! Less heat, fast, SATA cables are easy to use and don't cost $100 for good stuff.
But you want to spend how much? $1000 - 1200? a pair of Raptors or something? Seriously, get a G5 from Apple Specials. Your MDD can offset the cost later too.

G5 Dual 2.5 CPU Power PC will not boot unless I remove the Plastic Sheild.

G5 Dual 2.5 CPU with 4 gb of memory will boot everytime if I take the plastic sheild out. I bought it from a guy who would turn it on then let it sit until the fans revved up after about 5 to ten minutes. I figured out that it would boot everytime if I removed the plastic sheild. Now I am trying to find a permanent fix for this issue.
Thanks for any assistance anyone can give.

I don't think its just a plastic shield and door - there is a contact switch that signals when these are removed and the fans rev up to a higher speed. My guess is its the higher speed of the fans that's keeping things cool during the power surge of the boot stage thats allowing it to startup.
When the doors are on and the fans are kept low there must be some hardware failure that is occurring during boot up - that seems to be prevented when speeding the fans up. And after the initial boot up power surge, things run cool enough that I can safely put the plastic shield and door back on and the computer keeps running fine (it ran OK all night).
I can think of no other logical explanation at this time.
Any other ideas?
What puzzles me, is I use this computer to do some heavy 3D graphic renders and have run it intensely for days at at time with absolutely no sign of failure during operation once its booted up. I've never had a freeze or anything like that. So when its so reliable during operation, why so fragile during boot up?

Recommendations? USB 2.0 & Firewire PCI card for MDD Dual Boot G4 (1.25 Ghz

Can anyone recommend a good USB 2.0 and Firewire combo PCI card? (at least 3 USB 2.0 ports and 2 FW) for my G4 MDD Dual Boot- 1.25 Ghz)?
I have an Orangelink+ Micro USB 2.0/FW PCI card from the days of OS 9- that's supposed to be USB 2.0 under OS X, but isn't (it shows up as max 12/mbps in System Profiler). I'd like to get an external Hard Drive and most of them are USB 2.0 now.
Another question:
Under system profiler, it shows that I have one USB 2.0 port. I'm assuming it's an internal port, because all of the external ports show transfer rates of 12mbps. Is this a correct assumption?
Thanks in advance for any help!

Sorry. Posted in wrong section.
Reposted in "Expanding" section.
Moderator- feel free to delete.

PowerMac G4 MDD Dual 1.42 not recognizing hard drives

I have a PowerMac G4 MDD Dual 1.42 GHz, and I just moved across country, and it was working before the move, now it won't start up. It goes right to a grey screen with a blinking question mark and finder icon. I have 2 hard drives in it. One with Leopard, and the other with Tiger, and it won't recognize either. I reset the PRAM, I checked all the connections inside, started it up holding the option key and it doesn't show either hard drive. I also started it up with the Leopard install disc and using Disk Utility it still couldn't find the drives! Next thing I am going to try is resetting the PMU and see if that works...otherwise both hard drives went bad or possibly the cable for both of them went bad??

operati0n69er wrote:
... I checked all the connections inside...
When you checked the cable connections, did you check both ends of all cables? For example, if the moving loosened the ATA cable at the logicboard/controller end, checking the drives' connectors won't reveal much.
Do the drives spin up when you power the machine on (you may need to open the side panel and gently touch the drives while booting to test this)? If not, suspect a power cable connection issue. If they do, suspect an ATA cable connection issue.
Best way to confirm a cable connection is sound is to undo it and redo it - they can look okay when they are not okay. Do this with the machine shut down, of course.

Convert from a 15 pin to work on a G4 MDD Dual Processor

I just purchased a Powermac G4 MDD Dual Processor. I have an Acer AL1916WAB monitor. The monitor is a 15 pin. What do I need to purchase to connect it to the G4? I haven't a clue.
All help is appreciated.

I found my answer with a little research and I'm set! So I don't need help after all lol!

Powermac G4 MDD Dual 867 vs Powermac G4 Single 1.0 FW800

Hello, I have been a mac user since 2004. I had an iMac G5 1.8 that crashed and I want a replacement for the next year until I can save for a Mac Pro. I saw a great deal for the above Powermac G4's: MDD Dual 867 for $200 and Single 1.0 FW800 for $150. My friend was going to give me his 23" Apple Cinema HD ADC. I will be doing email, internet, about 90% of the time, and sometimes use Photoshop and Lightroom the rest of the time. I will max out the RAM at 2.0Gb, upgrade the Video to 9700 or 9800, and install 10.5 Leopard. What do you guys think?

C24, welcome to Apple Discussions.
A great price for both. Several considerations. Here's a link to the specs on both. http://www.everymac.com/systems/apple/powermac_g4/index-powermac-g4.html
1. Are you currently using OS 9 in classic mode. If so, you can use either Mac in Tiger. (same as your G5).
2. Do you want to be able to boot into OS 9. Only the MDD will do this.
3. The MDD Dual might be slightly faster if you use multiple applications at the same time and if you do extensive graphics/audio.
Unless you want to boot into OS 9, I would choose the 1GHz. Note: If you upgrade to Leopard, you won't be able to use classic mode.
 Cheers, Tom

MDD dual 1.25 CPU DEAD- WHICH MOTHERBOARDS had COMPATIBLE CPU's?

Similar Messages

Maybe you are looking for