I have the same problem too. The problem comes from BTC Guild definitely.

Well... at open and side setting case the temperature drops to 73 C at 100% fan which is very noisy and there will be dust problems. Anyway thanks for the advices so far.

Hello,
I've bought a new video yesterday for mining - Asus 6950 1 gb Direct CU II. After a few changes in my case improving the airflow, the temp. is very high. At 900 mhz core, 300 mhz memory, 100% fan speed , 1300 rpm front case fan and 900 rpm rear, at closed case the full load temp is 80 C (it was above 100 C before the changes). At open case it drops to 74 C. Is there any way to improve this temperatures and are they normal at all? It's very noisy too. Please for your comments.

Here is my system: http://picbg.net/img.php?file=4ab3249d0ed4c5df.jpg