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Novice> how do you accurately test a GPU overclock?

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Oct 25, 2012
Run 3dMark Firestrike or Unengine Heaven before your overclock.

Note the scores.

Run them again after your overclock. If you see any visual artifacts, tearing, etc you probably overclocked too high. If your score is lower than your baseline without the overclock you probably overclocked too high.