Problem with Sapphire 7870 2GB

[ZKRiNG]

Hi!

Im not sure if there the best place for ask about that, but i will try for im really desperate.

I buy one 7870 and from the first start, some times after the Windows logo, when the amd driver its charged before show the "Welcome screen" appear a monitor error about bad screen resolution. The problem too its i can't mining bitcoins/litecoins, with some time, some time less time, some time more,  appears "The driver stop working".

- I try different drivers 13.1 13.2 13.4 and 13.5 beta2, the best results beta2 but still happening the screen problem and the mining one.
- I change the PSU from OCZ 500W to Aerocool 750W
- Put new HD and install fresh Windows 8 (With W8 no more Driver stop working, just stop mining.

I speak with the store and say to me, make some tests, HDD, memtest and Funmark/3DMark. Any problem found with the tests but today i restart 4 times the computer for start Windows without the "screen resolution problem".

Really thanks

[kodo]

I've never used Sapphire good luck with your problem.

[ZKRiNG]

I buy it for have double fan, and now don't know what its happening and looks anyone found same problem, still making more tests