I got a Sapphire HD 7870 OC GHZ edition yesterday, before that I had a gt 220. Since yesterday, my PC has started to crash whilst I was playing demanding games. I ran Fur Mark and found out that my PC was crashing when my graphics card got to 56 degrees. I changed the drivers for older versions and that pushed it up to 75 degrees. Is there any fix for this because I have read that it should cut out at around 100? Thanks.