Setup your overclock and then open gpu-z and check that the lane isn't dropping to x8 or x4 but staying at x16.
Then, if you can, enable on screen display, enabling you to see the clockspeed while in 3D benching, check to see if the clocks set are actual. If everything checks out o.k. and you believe you're memory isn't overclocked too far, try un-linking the core/shaderclocks and lower the shaders a bit, test and re-run. Play with it to determine why its crapping out at those overclocks.
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What kind of community do you intend to re-build?
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