Hi,

I got some annoying issues with my new HD 7850. When playing Starcraft 2 (Multiplayer).  I get some strange "black flickering" from time to time. 

First i thought my card was broken so i replaced it with another HD7850, same issue. Because the 2nd Card had a very noisy fan i replaced it again. Im on my 3rd HD7850 now but the Problem is still the same.

I tried all drivers but nothing seems to fix it. Problem happens at stock, overclocked and even underclocked. It appears randomly. I already updated my Motherboard Bios, tried a different PSU and RAM. 
Never had any issues with my old GTX 460. Tried a gtx 570 of my friend also no issues. 
http://www.youtube.com/watch?v=YGnb9t8FHo8  here's a Video, it was very hard to record it since the issue sometimes doesn'T appear for days. 

I know it looks like a faulty card,  but i tried 3 HD7850 with the same Issues. Temperatures are fine and about 60-63°C when playing

Specs:
Win7 x64
Core i5 2500k (Stock)
Asrock z68 Pro 3
4GB DDR3
Sea Sonic X-Series X-560W PSU 

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