I upgraded to vista 64 and I have 4gig ram. Right now I have the Core 2 Duo 6600 running at 2.4ghz. The other day I was doing slavepens and underbog with my 5 man. I usually avg around 20-30fps on my main when I load them all up. But when I did the instance I dropped down to 10 and under on my main. I have all my video settings lowered and I am wondering if its mods causing this problem. I may bite the bullet and get 8gig of ram and a quad 6600. Not sure if it will be much better but if my main slows down like that when I am doing lvl 70 instances its going to be rough.

My video cards are an ATI 3780 512meg ram and ATI x1950xtx 512meg ram. Those cards should be fine. I think my problem is 4gig of ram with vista64. Everything I read says once you go 8gigs in Vista64 you will notice a huge difference. What sucks is I just purchased 2gig of ram so if I buy 8gig it will cost me about $140 and make my current ram useless.