Since I use ISBoxer to multi-box, I also posted this in the ISBoxer forums... I recieved the following reply from Lax who is active on both forums:

7, 2009 9:32 pm
Sun Nov 28, 2010 10:38 am by lax
Re: Video Card... Is more Vram or stronger GPU better?

Great question, I am sure a lot of people would benefit from the answer to this one.

The answer, hands down, is the GPU.

Adding more RAM (be it VRAM, system RAM, etc) is ONLY useful when you would otherwise run out. 1GB is plenty for multiboxing today's MMOs. Your VRAM is mostly going to be consumed by textures, and the screen buffers (each pixel on the screen probably uses at least 4 bytes, so a 1920x1200 window for example probably would use about 9MB). Textures are also typically moved between system RAM and VRAM as needed, so your system RAM can usually pick up the slack.

A faster GPU, on the other hand, (or faster VRAM) is going to improve overall performance (FPS). Always. And that's why faster GPU > more VRAM.

http://isboxer.com/forum/viewtopic.p...&t=825&start=0