My current system is a AMD 64 X2 3800, 2gb Ram and I have a 7800GTX video card. Would I see much of an improvement if I got a new 8800gt or even a 8800GTX? Or should I get another 7800GTX and run in SLI? I have an Asus A8N-SLI Prem MB. I guess I could even upgrade the CPU but the fastest one I've seen for sale is the 4400 and I'm not sure if that would be much of an improvement either? Any suggestions? Thanks! 
Kathy
Kathy