I don't see the operating system you have.
I run an old P4 3.2 Ghz (Dual core) with ATI Radeon HD 3850 AGP card.. yes AGP.
I have 4 GB of ram, and I am using the drivers that came with my card, not the most recent update.
I have yet to see 1 message saying out of memory. I am running XP Pro 64 bit OS.
Just saying...
-----signature-----
Member of What.CD | BTN | PTP | SCC
Psychopathic 11L4 Warlock

Proud Owner of 4TB, 1 Gbps Seedbox
Owner of 1819 Video Game Soundtracks and Climbing
Latest VGM Entry: Toy Music: Dancing Super Mario Brothers -
http://vgmdb.net/album/2351