![]() ![]() It's such a hardcore test that any GPU under test is almost guaranteed to hit its thermal limit, the mark at which the card's firmware will kick in, speeding up the fan to keep the GPU within safe temperature limits.Ĭonversely, simply leaving a game like Crysis running at a certain point also isn't reflective of real world use. ![]() We've found that Synthetic benchmarks such as FurMark thrash the GPU constantly, which simply isn't reflective of how GPU will be used when gaming. Thermal PerformancePutting realistic, repeatable load on a GPU to get a decent idea of its real world thermal output has long been something we've experimented here at bit-tech. Memory overclocking was unaffected by the increase in Vcore of course, so our previous best stable setting of 1,300MHz (5,200MHz effective) still stands. While the voltage tweak software isn't the most intuitive application to overclock with, it certainly did the business when it came to overclocking the card's core and with a bump of 0.1v from 1.15v to 1.25v the card happily clocked up to 980MHz core! We weren't done yet though as with a further increase in the Vcore up to 1.3v we were finally able to crack the famed 1GHz core clock, settling on 1,005MHz - an eighteen per cent improvement of 155MHz over the card's stock speed. The big difference then is how much of a difference the voltage tweak software can have when overclocking - we've previously pushed a stock HD 5870 to 925MHz on the core and 1,300MHz (5,200MHz effective) on the memory, improvements of nine per cent and eight per cent respectively. OverclockingAs the Asus HD 5870 ships set to the card's standard clock speeds, performance out of the box is identical to that of any other HD 5870 1GB currently on the market. ![]()
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