I JUST upgraded a system. MSI NEO4 SLI, A64 3200+, 512MB OCZ Platinum 2-2-2-5 1T, 1 Gigabyte 6600GT with passive cooling, 21 USB ports (with hubs), 2 80GB WD drives, 1 Maxtor 120GB drive all PATA no raid, 4 Firewire, 2 Ethernet (100Mb PCI, 1000Mb on board), 1CD/RW Drive, 1 DVD Drive, 1 DVD/RW, 1 Zip Drive. Running ZoneAlarm Internet security suite in the background, and all normal services, etc. This is my everyday set up. No changes were made from when I start it each day. Heck, the office scheduler was even running. I did not re-install windows when I upgraded the MB, Video, Ram, and CPU. I just plugged everything in and re-started it.
Latest Forceware drivers, all stock settings on MB and G card, and drivers and I got 3670 in 05.
These cards seem to be pretty strong.