The site was able to successfully overclock their AMD Radeon HD 7970 reference board from 1125MHz core speed to a 1267MHz core speed with a minor voltage bump from 1.15v to 1.25 volts using publicly available software and a special GPU BIOS (which VR-Zone claims will be revealed on Monday, January 9th).
We were impressed with the 3DMark 11 Performance Preset scores, which improved from P8227 on stock clocks to P10259 with the voltage adjustment. Nevertheless, 3DMark 11 Extreme Preset scores also improved from X2764 on stock clocks to X3490 with the voltage adjustment.
We look forward to reporting on AMD’s 28nm Tahiti GPUs in person at CES 2012 in just one week from now. In the meantime, more preliminary benchmarks and details can be found here.