Hello all,

I hope that I will get help again.
I have problem with Radeon 5870 1GB from Sapphire company.

The problem is with temperatures. When I tested this card I noticed that under 50 degrees card works perfectly. However if temp grow above 50 degrees then it restart the computer.
Moreover I set fan speed on the 100% and I run stress test with "furmark". The graphic card worked about 30-50s before it had reached a 50 degrees and restart the computer.

Could you give me some Tip what I should to check or something like that.

Can it be dependent on thermistor?

i think no, card dont have any thermistors

maybe VRM overheated, try to measure temperatures at some points on card

Thank you for your answer. I made many testes and the problem was very easy. HD5870 have some protection aginst processor overheating or something like that. So without cooling system voltages desapears.