I have two 2 Sapphire ATI Radeon HD 6950 TOXIC 2048MB GDDR5 PCI-Express Graphics Card. When I am playing a game on ultra settings after some hours the screen goes and a red light appears on the graphics cards. The fans go into overdrive. This is normally due to over heating I thought however the cards were only reaching 65c max. I thoughts cards could go a lot higher than that. Any ideas?