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ATI Radeon and Nvidia chip cards are both at the top of the line.
For example the card you were looking at:
EVGA 7900GT
Chipset: NVIDIA
GPU: Geforce 7900GT
Core Clock: 500MHz (Standard 450MHz)
Memory Clock: 1500MHz (Standard 1320MHz)
Memory Size: 256MB
Memory Interface: 256-bit
Memory Type: GDDR3
RAMDAC: 400 MHz
ATI X700 Pro:
Chipset: ATI
GPU: Geforce Radeon X700PRO
Core Clock: 425MHz
Memory Clock: 860MHz
Memory Size: 256MB
Memory Interface: 128 bit
Memory Type: GDDR3
RAMDAC: 400 MHz
Yes the EVGA 7900GT is statistically a better card, but $165 USD more. Most High End Video Cards will require hugh amperage to run around 30Amp on the +12v side.
Open your case and there should be a sticker on your power supply, on that sticker it gives the various amperages for the different voltages. What amperages does it list under +12V
This will drive which video card you can get, and whether it may be worth the investment for a new Power Supply that meets the requirements of Amperages.
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