So for the past 3 years I've been using an HIS Radeon HD 5870 and just recently I picked up an XFX 5870 for crossfire and to prolong my system's life. But Crossfire is not playing nice. I first noticed it in Mechwarrior Online and blew it off as the game is still in beta so I went single GPU, but then I've tried other games and I get the same symptoms.

See here for my recording in MWO: http://youtu.be/JPOW9-giogs

Not mine; but I get the same thing in Skyrim too: http://youtu.be/9oWnO7Wy2p8

As you can see the problem mostly goes away with menus and the like up (or NV/IR vision in MWO) I've tried the various Crossfire settings and "Default Mode" seems to be the one that doesn't flicker, but not always, depends on the game.

The hardware did not change between single 5870 & crossfire 5870 and I've tried with and without my overclocks. And I've done Prime95 for 24+hours for cpu, Memtest 86 24+hours for memory, ATI Tool (when single GPU) 12+hrs, Furmark 12+hrs for Crossfire. So the overclocks appear to be stable; but as I've said, I get this problem at stock speeds too.

GPU:
HIS Radeon HD 5870 (OC 1000MHz Core, 1270MHz Mem, 1262mV)
XFX Radeon HD 5870

AMD Catalyst Driver Version, and Driver History:
I've tried 12-10 & currently using 12-11 Beta due to performance gains I've observed

OS:
Windows Vista Home Premium SP 2 64bit

Motherboard or System Make & Model:
MSI 790FX-GD70

Power Supply:
ABS Tagan BZ1100 1100W
http://www.newegg.com/Product/Product.aspx?Item=N82E16817814012

CPU Details
AMD Phenom II x4 965 Black EdOC: 4.07GHz (220MHz Bus speed, 18.5x Multiplier, 1.435V Core, cooled by 360 Radiator)

System Memory Type & Amount:
12GB Mixed (2 Pair, will have to find links)

Bump?