I have 3 GPU miners each with a single 7950 card. One of the cards suddenly is going extremely high in temperature reaching cutoff within a minute. Fan speed shows as if it's spinning at normal rate. This is my first GPU issue since I started mining a couple of months ago. Can anyone tell me what I should look for?

I have since turned it down too  750MHz GPU speed and temps are steady at 87C - and this thing is doing as much hash rate as a USB block erupter, which is a shame.

Any help is appreciated.