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We overclocked Sapphire’s HD5670 via Catalyst Control Center Overdrive tool, which allows for overclocking the core up to 850MHz and the memory up to 1050MHz, which are at the same time maximum adjustable values in Overdrive.
The overclock resulted in up to 8% better results in Far Cry 2.
Sapphire’s card remained silent after overclocking. The temperatures went up from 55°C to 58°C during gaming whereas idle temperatures were pretty much the same as before overclocking.