Is it OK to Swap a Dual 1.25 Ghz Logic board with a Dual 1 Ghz one?

I need to replace the logic board in my original Dual 1.25 Ghz MDD Powermac G4. I found one that came from a Dual 1 Ghz Powermac. The person selling it says that they are identical.
Anyone know if it is alright to install the Dual 1 Ghz logic board with Dual 1.25 Ghz processors (and in the dual 1.25 case)? Thanks.
Dual 1.25 Ghz MDD Powermac G4 Mac OS X (10.4.8)

I have a dead dual 1.25 MDD. Indications are that the problem is either the logic board or the processors. I have heard the MDDs are known to have more logic board failures that other Macs, so I am thinking about replacing that...
Does anyone know how much could I expect to pay for the just the logic board?
Power Mac G4 dual 1.25, MDD Mac OS X (10.3.9)

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Is it possible to swap out the logic board and cpu of a 1.6ghz G5 with a dual 2.0 logic board and cpu?

i mean staying G5 the entire time, just going from
single 1.6 to dual 2.0 (not dual core).
I think you could do what you're asking about. The CPUs and motherboard go as a pair, so you can't drop a 2.0 GHz CPU into a 1.6 GHz mobo or vice versa. But, replacing the mobo and CPUs as a pair should be OK.
You'll likely also need to replace the power supply. The 1.6 GHz machines had a 450W power supply, and the 2.0 GHz machines had a 600W power supply.
However, you might want to talk with an authorized Apple repair center to see if there are any other technical hurdles that I've not mentioned.

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My G5 dual processor died on me. At first I was told it was the power supply, and i got a new one. It worked for two days and then died again. Now I'm told it's the logic board, which, installed, costs over $900!!
Has anyone had this kind of experience, and if so, where can i find a logic board that does not cost more than a brand new laptop!?!
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Logic board swap fw400 to fw800

My 867Dual died and all indications seemed to point to the logic board.
So I swapped the cpu into a FW800 1ghz (shell from parted psu) because they share the same 133 bus.
It works and I haven't had anything strange happen
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Now I can use the newer wireless card.
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Possible to swap MDD FW400 for FW800 logic board?

Hello all,
I'd thought I would ask this question because I have been thinking about this. Currently, have a dual 1.25 2003 model(not earlier MDD!) MDD G4 with the 2MB L3 per processor.
I just received today my airport extreme USB netgear device and I must say plugged into the USB 2.0 5-port card I have it is even faster than the Belkin PCI F5D7000 card! But, my question is concerning something else.
FW800 logic board - is it really worth it for me to swap current FW400 board with the FW800 board? 2ndly, can I use my existing MDD case or do I have to find another case? My power supply is a 360w power supply. I am not sure if it is a quieter one or not. The date on my power mac G4 2003 says: copyright June 2003(or was it July?) Apple computer. - Does this entail that the FW800 machines came out the same time as mine did? Again, I don't have the original MDD(867,1gh,1.25), I have the last dual bootable OS 9.2.2 MDD machine from 2003.
Also, is the airport extreme card going to produce faster results that the netgear WG111V2.0 USB device I currently have plugged into my USB 2.0 pci card? One thing I did notice is that I can no longer put my computer into hibernation or deep sleep, since I now have the USB 2.0 netgear wireless device attached.
Can anyone confirm if there is a way around for the sleep/hibernate function to work even with the USB 2.0 device plugged in? I also removed the Belkin wireless PCI card(FD57000). Before the USB 2.0 device, my computer would goto sleep and hibernate normally.
Thanks!

*9.x and Internet*: shouldn't be a problem with Ethernet. Forget which control panels you'll need to play with TCP/IP, Network? So if you want faster Internet with the MDD in 9.x, go with Ethernet -- the regular Airport card will work in 9.x by the way. That's the reason why for faster wireless, I'm going to buy the new Airport Express (with wireless -n), and connect via WDS to my Airport Extreme -- the MDD will connect to the Express via Ethernet which should be fine in both 9.x and OS X.
I did this once before my the original Airport Express (wireless -g) and an old Linksys all-in-one that supported WDS. But the Linksys blew its ethernet ports, so I replaced it with a newer model that doesn't support WDS.
*Copper heatsink* should fit any MDD CPU card, I've tried mine on both a Dual 867 and 1.25GHz cards, although I'm using a Verax cooler on the 1.25GHz Dual. The copper contact plate while narrow (about 1.5 cm) is a long piece, so it would contact both single and dual CPUs. As for the 1.25GHz dual in particular, see here.
Just a tip, use some good thermal compound, like Artic Silver. You'll need to clean off the old compound on your CPUs. I used Articlean (also made by Artic silver), works great. They sell a kit with both cleaner and purifier (preparation compound for the thermal compounds).
*Dual 1.25 2003*. I think the best way may be to check the model number. According to everymac.com, it should be M9145LL/A. I'm sure the info's also on Apple's site somewhere. The last 2003 1.25Ghz have 2MB L3 cache, which is easy enough to see in say System Profiler. If you're seeing 2MB L3, then you know you've got the CPU from the last 2003 model. As for the motherboard, you'd probably have to check the assembly number under the modem to insure a 2003 motherboard, but I don't think that matters as much as the CPU.
The CPU cards from MDDs and G4 XServes are pretty much interchangable --setting aside the issue of 133MHz and 167Mhz front side buses, which could overclock or underclock depending on CPU card & motherboard combination. And reading around there's an incompatibility with certain MDD Dual 1.0GHz on certain motherboards.
You could put an early 1.25GHz dual with only 1MB L3 on a 2003 MDD motherboard; for that matter you could stick a 1.42GHz dual from a FW800 MDD on your 2003 MDD motherboard, which some people have done. I guess if you're seeing Dual 1.25GHz w/1MB L3 advertised as the last 2003 MDDs, then people might not know what they're talking about, or may have replaced the CPU. The 1MB L3 versions cost less.
FW800, indeed if you want it, you can always add a card later. Since the MDDs don't have USB2, for that you'll need a card as I think you've already done. But there's always a worry of eating the slots. While rare, there are some combo USB2/FW800 cards. Problem with a combo cards over separate cards is that there's usually a performance hit on the FW side. A friend of mine has one that suffers from this -- like 7-10MB/sec hit. I recently bought a Siig combo FW800/USB2 and there's not nearly the performance hit; FW800 is only a few ticks less in MB/sec compared to my FW800 only card. In my DA, I didn't see any deep sleep issues with the Siig card, but every Mac is different. I've haven't tested it in a MDD, yet.
I'm working on getting two MDDs working (long story), so I have my hands full. Can't say I love the MDDs yet, but I certainly been bit by the tinkering/upgrading bug. So I'm have fun getting my two MDDs together that are both very close to being ready -- I need to stress test them before moving over my HDs/data, cards, etc.

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Quote from: Henry on 08-December-09, 10:47:03
Have you tried using the 'Search' function up there.
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Hello Everyone
I am looking at a 600Mhz Logic Board from an iMac g3 DV I found on eBay for my 350Mhz iMac G3. Is it possible to swap them? Also, is there any documentation from Apple or somewhere on the internet that explains the process of swapping logic boards on an iMac? I just installed Tiger on my old iMac G3 and believe it or not is running pretty smoothly however it could obviously stand for an upgrade.
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I think your 350 can go as high as 450 or maybe 500. Above that the processor is located differently and wouldn't aline with the heat-sink. I have swapped out a 350 with a 400 without issues.
Rick

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I have a perfectly fine working 1.8ghz G5. I also have a dual 2.0Ghz G5. However, the dual doesn't power up. I'm pretty sure it's the power supply. But, I'm not positive.
My question is. Is it possible to put the dual 2.0 logic board into my 1.8ghz machine? The inside of the cases look very similar. Or is there a way to test the logic board of the 2.0 before I take everything apart?
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For those interested, I noticed my Dual G5 2.5 was showing only one processor in the system profiler as well as the activity monitor. Searching for other threads this problem had been mentioned before without a solution.
I first contacted applecare which eventually directed me to my local apple store. The problem was determined to be a faulty logic board (despite passing the apple hardware test with the included OS X DVD). The logic board and the dual processors were both replaced by the apple store under applecare with resolution of the problem (Two processors now showing up under system profiler and activity monitor). By the way, the fans are much quieter and less active. I clearly was previously running under one processor. I do note a significant step up in speed since the change.
I hope this helps anyone else with similar issues.

Nice of you to post this. Sometimes, people spend a lot of time trying to "fix" their system when there is really an underlying hardware problem. The trouble with Macs is that you can't really deal with hardware issues yourself like you can with a peecee. Also, your post points out the questionable value of the hardware test disk. I have had the same experience a number of times where the hardware test will show no issues but it turns out that there is a bad proc or MLB or video card or RAM or whatever. Sometimes a trip to the repair shop is the only good option.

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This will seem a strange question, and difficult to get an answer. That's why it is being posted here.
How may one find out the cost each of the following, if purchased during July 2007 to August 2008 ?
• New logic board for the Quad G5
• Used logic board for the Quad G5
• New logic board for the Dual G5
• Used logic board for the Dual G5
If the exact amount of each isn't known, does anyone have an estimate, or a suggestion on how to get these four cost amounts ?

Hello,
I am not sure I completely understand what you are asking... The simple thing to do in pricing out each of those 4 parts is to check out ebay... Then add maybe a few hundred dollars to them and you willl get similar pricing from back in 2007 to 2008. A Quad G5 logic board today can be had from anywhere to 100 up to 350.00.. Back in 2007, it was probably around 5-600 dollars..
But, really I would check out ebay and do a search for G5 Quad or Power Mac G5 Quad.. as for the dual G5? Really, those were not even worth it, given their extreme LCS leaking problems, especially the 2004 Dual G5 2.5 which was notorious for leaking.
The Quad is by far the best you can get... and make sure you find one with the SINGLE PUMP as it was the most reliable made and still is. Those came out in the later half of 2006 from April until September of that year, while the dual pumps were in Late 2005 October.

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I have a (late 2005) dual 2.3 that has been dropped 3 Times!
It is on it's third power supply. The repair center that was in fault is now replacing the case and logic board. My questions:
Does the fact that it has/had a faulty logic board be contributing to the power supply failure?
Should I just be done with this machine and move on once the new logic board is installed?
I'm skeptical to a unit that has been thru so much abuse, but at the same time doesn't new logic board & case = new computer?
Your thoughts
Thanks

Hi! I'm surprised it survived the first fall let alone the second and third. The g forces could have damaged both the MB and the PS and if a repair center had dropped it I'd be inclined to want a replacement. Tom

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I'm in way over my head here swapping over a logic board on a Powerbook G4 17" 1.33, with the help of a guide at ifixit.com, ifixit has a thermal paste guide but I'm still not entirely sure on how it applies to this particular machine.
I've removed the faulty logic board and the replacement one is on standby - here's a photo of it; http://img810.imageshack.us/img810/3964/logicboard.jpg As you can see on the lower part of the image, bottom left corner there is the motorola processor, then next to that approx 1.5 inches square there is a heat sink(?) and then next to that there are 4 squares with a grey diamond shape in the centre - not quite sure what this is.
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some replacment boards are shipped with "thermal pads" - foam is likely leftover from the removed thermal pad, which are kind of sticky thin plastic-like pads and are glued to the chips on the board.
maybe consider getting some pads at your local computer store, if not mistaken, pad is only used on the processor chip, paste is used on video controller chip for that logic board
hard to guess what pad thikness/type is supposed to be used on that board, so maybe the paste is a better option

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The first one to prove this with a screen capture was jb510-LJ0JJQ in August 2009: http://forums.adobe.com/message/2207312#2207312
Eight months and three OS updates later the problem is still there and makes professional work with more than one monitor a nuisance.
Here's another actual example: A picture and its 100% identical copy showing different colors on one screen!
Here's how to repeat it – try this at home ;-)
1) In the finder make a copy of a rgb picture.
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There have been several threads dealing with this malfunction. But most faded out in silence or acceptance of the workarounds.
http://forums.adobe.com/message/2207312#2207312
http://forums.adobe.com/thread/521483
http://forums.adobe.com/message/2272192#2272192
http://forums.adobe.com/thread/311761?start=0&tstart=0
http://forums.adobe.com/thread/618927?tstart=60
http://forums.adobe.com/thread/603992?tstart=90
http://www.wetcanvas.com/forums/showthread.php?t=552977
http://www.hilfdirselbst.ch/gforum/gforum.cgi?post=368889?search_string=zwei%20monitor#368 889
But man, this is no minor bug! Consistent colors are the by far most important basic function of photoshop. If you cannot rely on the colors in photoshop you can as well use "Preview" and "Word" for print production ;-)
Carson, how did Apple react to your complaint? What do you mean with "they don't get it". Do they not see it? Or can't they get it right?
Shall we open a thread at apple forums to point out that it's not the problem of a single user?

Dual 27" iMacs - one as a monitor?

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http://www.belkin.com/IWCatProductPage.process?Product_Id=508255

Hey thanks - that's a good call. I found the answer I think...it just took putting the right sequence and combo of keywords in to Google
_#2 here says:_
Connect a male-to-male Mini DisplayPort cable to the Mini DisplayPort on each computer. The 27-inch iMac will enter Target Display mode and display content from the source computer.
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http://support.apple.com/kb/ht3924

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Is it OK to Swap a Dual 1.25 Ghz Logic board with a Dual 1 Ghz one?

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