I had heard that on the vram but even on old games like Battlefield 2 & 2142 its stuttering which worked fine on my old 256mb card at the same resolutions.
What model was your old card?
Check out this old thread
for more details on the 8800 series memory management bug. It was supposedly resolved at some point with a driver update, at least for DX9 games. You'll even see me raving in the last post that the driver fixed my issue in WiC. Well it didn't fix the issue in other games, and I eventually had to drop the 320MB GTS for a 512MB 8800GT.
I haven't recommended an NVIDIA card with <512MB since