Hi,
I'm new to BC mining and I have a rig with 2 HD 6850s (CrossFireX disabled) running GUIMiner.
Both GPUs are GigaByte brand and have been factory OCed to 820 MHz and memory OCed to 1050 MHz
According to online sources,
https://en.bitcoin.it/wiki/Mining_hardware_comparison, I should be getting about 250 Mhash/s from a 6850 but currently I am getting only 150 Mhash/s from each of my GPUs
What could be wrong?
![Undecided](https://bitcointalk.org/Smileys/default/undecided.gif)
Thanks