7950 making computer freeze

[Waramp22]

I installed a 3rd 7950 TFIII on my mining rig the other day. It ran for a full day and now it is intermittently causing my PC to freeze. Its an MSI 7950 Twin Frozr III. I have noticed in cgminer that the frozen screen sometimes shows very low 5*C for temp or something outrageous like 342*C. Seems like its temp sensor is screwed and intermittently fluctuating is causing the computer to freeze up. Are there any tests i can do on the card? Is the sensor replaceable? Try another driver perhaps?

I have rotated the cards around and this card is the troublemaker.

Thanks

[Equate]

out of three cards one is faulty , which leads the freezing of screen, check the temps of three cards and the card who is having 300+ temp is faulty.

[cdog]

could be power supply, how many watts you got and is it bronze or gold rated?

[ScaryHash]

I'm with the above poster.

What's your power supply rated for, and how many PCIE cables does it have? It could be a power problem.

If you're running really close, or using crappy molex to PCIE adapters, it may be you just don't have enough juice.

I'm running 2x 7950 powered by a Corsair CX 750 W (non-gold,non bronze), and it seems to do just fine, stable for weeks.

I used to run only one 7950 on a Corsair CX550, and occasionaly, it would freeze. I don't think that was a great power supply.