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The Mac Pro First Generation is an Intel Xeon-based workstation computer manufactured by Apple Inc. The first generation model includes the machines from 2006 through 2008.

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Mac Pro PSU compatibility

Last month I gave the description of the problem I was having with my Mac Pro on this site and the recommendation I received from Mayer was to replace the PSU. In the region where I live (QC. CANADA), finding a reasonably priced PSU is quite difficult. So I bought another inexpensive Mac Pro with the idea of using the PSU to replace the faulty one. After using this computer for two weeks, I can confirm that it is working without problems so the PSU appears to be in good condition. While performing the replacement, I noticed two differences between the PSUs; the Apple part number and the output amperage (V1, V2, ... V6) which is not the same for all values. It seemed safer to have the advice of a specialist before proceeding with the replacement. Here is the information of the 2 Mac Pro:

The one I already have; Mac Pro 2.1 / 1186 / 2x3.0Ghz / PSU 614-0407

The one bought recently; Mac Pro 3.1 / 1186 / 1x2.8Ghz / PSU 614-0409

Will the 3.1 PSU be compatible with 2.1 despite the differences?

Can 614-0407 only be replaced by one with the same Apple part number?

Another point I would like some advice on is the heat buildup in the compartments where the RAM sticks are located. I compared the 2 machines and after only 10 minutes of operation the 2.1 (8 x 2GB) really gives off a lot more heat than the 3.1 (4 x 1GB). Note that all sticks have the Apple approved heatsink and that they have been dusted. Is it normal that 2.1 produces so much heat in such a short time? Could it be that this heat build-up is a cause of the malfunction of this computer?

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@mayer - What do you think? I've never tried mixing these systems PSU's.


I never tryed


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PSU’s are generally universally compatible. The connectors not so much ;). as long as the output values are about 5%-10% of each other in voltage you should be ok. The system shouldn’t pull more amps than it needs unless there is a different problem. The rule of thumb is generally go higher on wattage when replacing a PSU.

As for the RAM the heat has to do with the diodes and resisters sizes. newer ones are smaller so use less power to do the same thing as the distance between layers is less so require less power to traverse it. This being said heat is what always kills these types of components. also the hotter they get the more easily the electricity can flow between layers resulting in errors and potentially damage.

additionally I remember working on a apple 2(i think) back in 1996 and the heat the RAM gave off was horrible and they had to design the case so it had more airflow after that model because of them failing. Those things could(and did) heat up my classroom in the winter were it was really cold!

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Benoit Myette zal eeuwig dankbaar zijn.

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