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2. It is impossible to combine the power of multiple cards.

Say what? Certainly GPUs can join forces through technologies such as Crossfire? As for three GT120s... just get a HD4870.
 
Say what? Certainly GPUs can join forces through technologies such as Crossfire? As for three GT120s... just get a HD4870.

Crossfire is ATI technology.. These are nVidia chips, so no, no Crossfire. Moreover, nVidia has never made SLI technology available for Macs. As far as I know, the only reason one would want more than one graphics card in a Mac is to support more than 2 monitors.
 
Could you not do Crossfire under Windows, assuming power is not a problem? I've seen some "small" PSUs that fit in the optical drive bay, I'm sure one could power one of the 4870s and the regular power supply the other.

I would not do it because it blocks out one of the PCIe slots, which means that I can't plug in all of my necessary components that I would BUY a MacPro for...

Or am I rambling?
 
Could you not do Crossfire under Windows, assuming power is not a problem? I've seen some "small" PSUs that fit in the optical drive bay, I'm sure one could power one of the 4870s and the regular power supply the other.

I would not do it because it blocks out one of the PCIe slots, which means that I can't plug in all of my necessary components that I would BUY a MacPro for...

Or am I rambling?

Yes, this is possible. It has been done, in fact. It uses ALL of the PCIe slots.
 
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