yes you need to upgrade, your mobo, ram and cpu, and gpu, mainly mobo, i mean nforce 3? now its 7
go for the m2n-sli board by asus
features
Nvidia 570 sli chipset
socket AM2
4 DDR2 800mhz ram slots - up to 8 gbs
1 PCIe 16x
1 PCIe 8x
if sli both at 8x
6 SATA
2 IDE
1 Floppy
great board for a great price
ive used it for 1 1/2 yrs never had a problem
Vid card
go with a 7 or 8 series
if 7 go with 7900+ or 7950GX2
if 8 go with the 640 mb model
CPU
current cpu will bottleneck a new gpu
so go with 5000+
PSU
youll need a new one if yours is less than 400w
i have 600w (overkill) but comes with protective features
minimum of 450w
these are SUGGESTIONS, always research and make sure your previous components will work with new parts (hdd, cd/dvd, anything else)
Helpful links:
tomshardware.com - comp hardware review
newegg.com - shopping
mwave.com - shopping
!!always email and question your seller they will answer you back, they want your business, better customer service usually draws people to them!!