Quote Originally Posted by zanthor
Basically I'm looking for the answer to this question...
Do I buy a new mainboard, quad core intel chip, and ram, or do I upgrade my 7900gt... which despite being a year old is STILL a damn fine video card with 256mb of ram.
The original question you asked is far outside the scope of this forum. Google up "GPU architecture" and start reading some of that and it might shed some light on things. With the advent of the GPU, the VRAM is used for a lot more these days than it used to be.

As for this more specific question, I would most definitely upgrade your mobo/CPU/RAM first as that card is indeed a fine performer for what WoW does. Now, if you want to be able to drool over Crysis or other bleeding-edge games, the answer is "it depends." :P