48x0 Crossfire Display flickering/wavy?

[sabrewulf165]

Anyone else experiencing this? It almost looks sort of similar to a CRT with a very low refresh rate, or maybe with some kind of signal interference. It disappears if I disable CF. I've tried with both one and two CF bridges on the cards (4850's in my case)

So far I've tried:

-one bridge vs two, swapping bridges, diff connectors
-vsync, refresh rate, in-game fps caps, etc.
-various CCC settings including Cat. AI and DVI frequency/alternate
-enable/disable hotkey poller/external event util
-set mobo PCIe to 101 instead of 100
-diff ports on the card
-diff dvi cable
-dvi/vga adapter
-diff monitor
-diff cards (borrowed a third 4850 for this purpose)
-diff drivers (have tried them all at this point, CD, 8.6 hotfix, and all varieties of 8.7 and 8.8 both official and non)