ASUS 69X0 DirectCU Dual-link DVI design bug?

[Katanaq]

I have a weird problem with ASUS 69X0 DirectCU cards. I have had 2, one 6950 DirectCU and one 6970
DirectCU. Both exhibit flashing pixels of one color both at graphical BIOS and Win7. With 6950 pixels
were green and with 6970 red.
This only happens when using high resolution monitor (2560x1600) on Dual-link DVI port with switch on board turned on. No problems with single link 1600x1200 monitor at all.
Shop also confirmed 6950 was faulty, but now a replacement 6970 is showing same problem, but with red
pixels this time.
My 2560 monitor should be ok as it works perfectly on my second computer.
Is this is design bug, something to do with Dual-link DVI and DisplayPort switch?
Rest of the system:
Asus P8P67
Core I5-2500K

 

[DBO6]

I have a weird problem with ASUS 69X0 DirectCU cards. I have had 2, one 6950 DirectCU and one 6970
DirectCU. Both exhibit flashing pixels of one color both at graphical BIOS and Win7. With 6950 pixels
were green and with 6970 red.

I just built a i7-2600K rig with two ASUS 6970 (DirectCU) cards and am getting the exact same problem. Very frustrating, the DP ports work fine, just just not the dual link DVI. Did you ever sort out a fix?