my facility:
MSI GTX 670 PE/OC (only one GPU)
i5 3570
corsair 600W GS
corsair 8Gb 1600
MSI Z77A-GD55
Win7 64
guys from MSI service said that it is not a fault of graphic card and they sent it back to me.
in addition when i get out the GTX and run the games on integrated graphic card problem disappear :/
sorry for my english