I recently upgraded my Graphic card from EVGA 8800GTS 320mb to MSI ATI Radeon HD 4890 OC (880/999 factory OC ver.) and had an issue about having a low score on 3DMark06 with the 4890.
I was getting around 11k-12k (when others get around 14-15k).
So I thought it was the new card that was having the problem, so I uninstalled 4890 and went back to 8800gts to see how it would perform, and apparently, its 3DMark06 score was 8880gts..... (when others get around 11-12k).
Therefore I thought that it would be the other hardwares that would be causing these low benchmark scores.
-When testing with 4890 or 8800gts, the drivers were up to date.
-When I ran HardwareOC Crysis Benchmark 1.5 on either cards (1920x1080, Very High, No AA), 4890 got avg of 32fps, and 8800gts got 16fps...