What are multiple video cards good for?

Yeah, I know it is probably a dorky question but I would certainly like to know the answer before I start pricing my future Mac Pro. What I'm thinking about is online gaming stuff (which I'm just getting into so I'm still a little clueless). My question is:
Are four GeForce 7300 cards better than one X1900 for gaming/graphics?
It sounds like from the other posts that the X1900 is the superior card. Am I reading things correctly?
Thanks,
Toast
867 MHz G4 Powerbook   Mac OS X (10.4.8)  

One advantage of multiple video cards is monitor calibration. When running two monitors off of one card, it's simply not possible to (accurately), calibrate both screens. Altering the video LUT of the card to dial in one monitor will affect the calibration of the other.
On my previous G4 system, I ran two screens from separate cards (two CRTs - different makes and size). With hardware calibration, I was able to get them to match perfectly. On my Mac Pro running the same screens from only one card, I can get them close but not perfect - more importantly, I have to decide which monitor is to be properly calibrated.
Not particularly important for gaming performance but there you go ...
-phil

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