I have 2 Gigabyte 6600GT GV-NX66T128D in SLI and my temp. on the first card reach 101 deegres (under heavy gaming,3D Mark 05...etc) I let it run 1-2min uder 101 deg. and the card survive.In the BIOS settings for PEG Link are on Fastes-no OC.( 520/1030) in nVIDIA control panel. I have Tsunami dream case wit two 120mm fans and 4 BGA Revoltec Cooper ramsinks on the cards, The other card stay on 75-80 heavy load. I Think the sensor readings lies,at least for one card. What Temperature will kill the GPU and how long will take to burnit ? Im afraid to run at 101 C for more then 2min. Now, I removed the side panel of the case and put it a huge 250 mm roomfan to blow direct on cards. Idle temp. now are 62/and 81 on load. Sorry for bad english!