I got a similar SLI as yours, got 2 of 480 and I had the same problem till I did a mod. This is what I did, GFX have been moded like a year now and temps dont get higher than 50 degrees. Hope this is usefull for you and dont be scared to do so, many people are :-) http://www.overclock...-480-with-antec If you need help or got any question let me know. Not long ago one antec kuhler broke and I got it replaced with an accelero.