"In the standard gaming tests, the HD 6770 delivered results indicative of its architecture. Overclocking the HD 6770 lead to measurable performance increases across the board for not a lot of time commitment. The HD 6770 FleX was able to push out a 11%+ improvement on the core clock to 945MHz and a 13%+ bump on the GDDR5 memory clock to 1374MHz - both substantial and worthy of the time commitment."
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