HIS HD3870X2 also can do 918Mhz >> http://www.techpowerup.com/reviews/H...870_X2/23.html
maybe one of the Cores of your HD3870X2 not so good and looks like the max OC will be the Max Mhz the weakest Core can handle :
We managed to max out Overdrive with the highest settings available. We found that when you overclock, both GPUs will overclock at the same frequency. Therefore the GPU with the weakest overclocking potential will be your highest stable overclock.
http://enthusiast.hardocp.com/articl...50aHVzaWFzdA==






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