When it comes to OC’ing, it seems that ATI’s 4850 GPU is limited to right around 670-685MHz. We’ve tested nearly half a dozen different cards and they all seem to top out around that speed despite cooling.
Basically don’t expect Sapphire’s Toxic board to OC any further than other 4850 cards, as it appears the GPU itself just can’t hit 700MHz+ speeds.
8xMSAA Performance
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