sabby said:Can't agree. I use Win 7 Ultimate 64bit with 2GB RAM. It never consumes more than 700MB unless I game or open multiple tabs of firefox etc. And for your info, I played CRYSIS, WARHEAD and got ~35 fps with max setting. And enabling texture AA requires more VRAM not the system memory. Also, OP's CPU is causing a bottleneck when the GPU is trying to perform in DX10 mode.
Yes i agree too ,Win 7 in 2gb consumes 700mb .
I disagree that cpu will be a bottleneck , coz it was ok in xp 32bit , but gone wrong in Win 7 64bit. Not possible.
I also think ur ram is the bottleneck here.
I myself experienced fps lag during 2gb in gta 4 and had to upgrade to 4gb.