Calling Mac Pro 2009/2010 owners with 68x0 cards

anybody here using 68x0 card in mac pro?

how finding it?

bought myself xfx dual fan (hd-678a-zdfc) 1gb, flashed , tho works wonderfully under full load, keeps crashing/freezing machine in os x , w7 @ random points. 100% if dvi monitor isn't plugged in.

setup:

mdp dp: hazro 27" @ 2560x1440
dvi dvi: hazro 26" @ 1920x1200

happens when falls over:



i've reseated card , still it.

can force freeze by:

1. waking sleep mdp monitor off.
2. having mdp monitor connected.
3. having dvi monitor connected.

think these related power saving mode, because both screens connected , on kicks full 3d mode, where-as if 1 screen connected goes power saving mode.

cindori, netkas, ideas? need 100% stable, if can't fix have find myself reference 5870 , flash or wait until 7 series mac pro cards come out. or go nvidia *shudder*.

edit: ok, weird behaviour.

if 1 display plugged in (any combination of hdmi/dvi/mdp) crash.
if 2 displays plugged in (any combination of hdmi & dvi/mdp & dvi, dvi & hdmi) fine.

cheers!

 

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