Video cards become much hotter

[tomhardcore]

Alright my current setup is 2 EVGA GTX 275's in SLI and 1 9800GT for PhysX. I got the 9800GT for my third display but I haven't gotten my new desk to put the third monitor on so I have 1 display hooked up to the 9800GT and the other hooked up to my GTX 275. The temperatures in idle are GPU 1 (275) 62C, GPU 2 (275) 57C, GPU 3 52C. And when I play games GPU1 goes all the way up to 90C, I was bugging out. Before I installed the 9800GT today my temps were normal, at max it would get to 75C. Is it because my power supply isn't strong enough? It's a 750 Watt PSU http://www.newegg.com/Product/Product.aspx?Item=N82E16817339002 , could it be that there's not enough room between all the graphic cards that there's poor venting? I have a coolermaster HAF 932 with plenty of air flow for the beast. I didn't overclock anything. I installed the latest drivers also. My specs are Intel Core 2 Quad 3.15, 8GB ddr2, windows 7 rc, HT Striker Omega sound card, plenty of fans, 500GB harddrive. Any help would be appreciated

 

[tomhardcore]

Never mind I figured the reason out. It's because I was playing Cryostatis at max settings and that game has a lot of textures and physics involved so my cards were put to the test with this game. In cod4 and l4d they are normal temp

 

[JAYDEEJOHN]

Yea, it really depends on your mobo layout, as I believe the 275s dont expel all the air out the back, but some goes back into the case, and maybe 1 card is blowing on the other a lil