ok i read all youre openions.about the psu i agree with you,but about the cost diffrence between 6600 sli and 6800 or even 7800 i gotta tell you somethin. of course 7800 is so so so much better than 6600 gt sli according to the benchmarks but this is our problem in here(iran).we cant use credit cards to buy from internet ,most of the shopping sites dont even support iran. and about the prices,here they are a little unusual,actualy i bought the second 6600 and each one only for about 100$ it means 200$ for both(pixelview 6600 256 le),and at the same time 6800(not gt) will cost me about 370$.so i think you all got the point. ok now that im using the sli there is a problem,my secnt graphic card is very very close to my asus tv card and its temprature is 10 degree more than the first one.will this make any problem for me? thank you all.