Reviving an old post...

I actually have a  Gigabyte GA-990FXA-UD5 here. Rig is running nicely with 4x 7970 Sapphire Radeon, mining LTC.
But when I add a fifth card of the same kind, it shows up in the windows systems manager (Win 7), but 'Stopped because of a problem' (paraphrased) EDIT: Code 43.
The 4 cards have unpowered risers, for the fifth card added I used a powered riser.

When I unplug one of the other cards, the fifth card runs no problem. So that one is not defective. Seems to be an issue with Win7 not being able to have them all operational at once.

So, please, any advice how to get all 5 cards working? Thanks!