Few months ago, i've just bought a pc. My motherboard is P4VT8+ from Asrock ( www.asrock.com ), with P4 3.0GHZ, Apacer 512MB RAM, Geforce FX5600 256Mb and power supply 450W. I'm planning to upgrade my video card, maybe FX5900 ultra or FX5950 ultra. Can my motherboard support both cards? or how about Geforce 6800? Can my motherboard support that high-end card? pls help.