Hi Neverheal!

I have almost the same setup as you, but with a slightly slower processor. I have the HD 3870 and am running 4 wows on one monitor. I think you may have some issues with the X1650 as the memory interface is only 128-bit wide and the clocks are slower. The X1950 was considered the highend of that family of cards. The next family was the HD 2400/2600/2900 and then now they have the HD 3850/3870 (soon the 3870 X2).

If using ATI/AMD cards, I think you should have at least a HD 2900 or 3800 series. I dont' have data to back this up, but I can try to get a hold of a 2600XT and 2900XT test them in my current system and see what the performance is like.