I recently bought a Sapphire HD 4850 HDMI dual-slot graphics card. Unfortunately, it's running on a rather poor north bridge/mobo, but I have updated the PSU to a strong BFG LS-550 550W.
Everything's running fine, and games play very well, with low temperatures. My issue is artifacts (on desktop, and during games) and vga failures ? (the screen turns black, monitor light goes off - happens during WinXP startup usually).
There is also a random ati2dvag.dll error randomly, for all games.
I've tried older drivers, underclocking, and even a Windows XP reinstall. Any other ideas? Is it possible that the vga isn't seated properly - because I had a lot of difficulty getting the old one out and the new one in .. Thanks, I appreciate any thoughts.
More about4850 artifacts crashing
I think you have a bad video card that needs replacement.