Is it dead gpu?

What PSU brand is it? What is the rail info?

rvbfan said:

You didn't mention what case you are using for your PC. Heat is the biggest killer of GPU's.
Try pulling the side door off the case and see if that helps. If not the card is probably toast.
If you end up getting another card try installing an extra fan inside the case infront of the
HHD and direct the air into the case or leave the case door open and see what temps are like.
I have the same card and my temps rarely go over 55c. Mind you I have good air flow.
You also need to clean the GPU fan occasionally especially if you live in a dusty area
or have your computer on carpet.

Thats my temp. I tried with open case before as I thought its overheat, no difference.
I will try to reinstall windows tonight, maybe that will help.

parabellum said:

What PSU brand is it? What is the rail info?

PSU is: PowerCool 80+ 850W PSU Quad 12V V2.2 rails 12cm Fan Active PFC

It might be the PSU - Powercool looks like a $15 rebadged OEM unit. Do you have another to swap it out?

i CAN TOOK OUT MY BROTHER PSU BUT ITS ONLY 400w OR 550w Dont remember now.

As long as its a quality unit from Antec, Corsair, Enermax, Seasonic etc.

parabellum said:

As long as its a quality unit from Antec, Corsair, Enermax, Seasonic etc.

ahh no its unknow brand at all.

The temps are fine. My 6870 can hit 60 after 6 hours of gaming.

Not really talking about the temps now more about the core overclock, could be your card just doesn't like
being overclocked. Try setting it back to defaults and see what happens.