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The GeForce 7900 GS core uses up more than the 75 Watts the PCI-Express slot can deliver, 83 to be precise. Your PCI-Express slot can only deliver 75 Watts. So you'll need to hook the graphics card up to your PSU.
Memory then. Hynix gDDR3 rates 1.4ns Let's do some math .. 1000:1.4= 714
So the standard clock can take 714 x2 (Dual Channel) = 1428 MHz for certain. You'll notice that all cards today are equipped with 1.4ns memory and comes from the Hynix gDDR3 HY5RS573225A series.
Now does that look good or what ?
The packaging of the 7900 is really interesting. It's extremely small thing 25-30 CM in length.