Hi, my card is HIS HD3850 512M IceQ3Turbo X, i have tried the HIS3850_512MB_3870volt.zip provided by BO FOX, the voltage indicated by Rivatuner is just the same as HD3870, but it seems that the OC ability doesn't improve much, i can only get around 770M hz for the max core speed, so is there some limit in the bios to go beyond 777Mhz? Or my card itself is not good for OC? Here is my default bios:
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