Quote Originally Posted by JustusIV View Post
Actually i found out the cause not sure why or what, but running two 5870's in crossfire caused it. Pulled one out and bam started working. I did all the basic's so something weird is causing it. Anyone have issues with running crossfire causing something similar? i ran a ping test that recorded and i dropped 8% of all pings. for a whole day. pulled the cards, haven't dropped one since.
Try more IOH voltage or possibly pci-e voltage see if that helps.