Mac Pro power supply for PCIe - Upgradable?

[Darkfire]

Basically what the title says:
Can one replace the power supply (frankenstein, anyone?) with a bigger one to get around the 300 watt limit?
Three 4870's and three 30s is just awesome.
~

[Tallest Skil]

1. You can't FIT three 4870s at all. You can run three 30" Cinema Displays with two GT 120, for crying out loud.
2. The power supply is not the problem, the PCIe bus is.
3. You can't change the bus.
4. You would need an entirely different logic board because the power supply has nothing to do with connecting external power for graphics cards in a Mac, but the number of 6-pin molex connectors on the logic board does.

Build a Hackintosh if you need three for whatever incorrect reason.

[matthew.russo]

Im curious about the same thing to setup 2 4870's in crossfire on the mac pro 2008 model. I was thinking of using a 5.25" psu with 2 pci-e 6 pin to power it. FPS provide a 300w model which would be perfect. There are 2 16x PCI-E slots available so no bottleneck. It would work theoretically.

[Tallest Skil]

Im curious about the same thing to setup 2 4870's in crossfire on the mac pro 2008 model. I was thinking of using a 5.25" psu with 2 pci-e 6 pin to power it. FPS provide a 300w model which would be perfect. There are 2 16x PCI-E slots available so no bottleneck. It would work theoretically.

Two work with either external power or power split from the optical drive bay.

[matthew.russo]

Two work with either external power or power split from the optical drive bay.

I have pretty much gone ahead with that.

http://forums.macrumors.com/showthread.php?t=665034&page=4

[Tallest Skil]

I have pretty much gone ahead with that.

http://forums.macrumors.com/showthread.php?t=665034&page=4

Oh, but you just don't have the cards yet, correct?

[matthew.russo]

Oh, but you just don't have the cards yet, correct?

Yeh they don't ship till the end of this month. It is all pretty much ready to go though.