If you thought the AMD Radeon HD 7970 graphics card was overpowered on its own, you were probably right. That doesn't mean people can't push it into overdrive just to see how far it could go.
It also can't actually stop people from doing something of the sort to three of them at once.
This is precisely what VR-Zone did: took three HD 7970 cards, set them in crossfire, clocked them at 1,100 MHz and
put them through as much benchmarking stress as they could.
That happened after they took just one of them and, upon replacing the BIOS and boosting the voltage from 1.15V to 1.25V, bypassed the the normal upper clock limit of 1,125 MHz.
Ultimately the card operated at 1,267 MHz and
made short work of several benchmarks, all the while being kept at acceptable temperature by good old fashioned air cooling (never went above 66 degrees).
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