Overclocking the Sapphire HD 5670 1GB Video Card

QUOTE: "There’s been word floating around that the HD 5670 is quite the overclocker with it running into no problems achieving the maximum GPU clock of 850MHz that is offered via the Overdrive functionality inside the Catalyst driver suite.
With our Sapphire HD 5670 sitting around and not doing a whole lot, we thought it was time to throw it back into the testbed and see if we could not only max out the overclock of the card via the Overdrive feature, but also see what kind of performance increase we can achieve from doing so."
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