Over at kingpin cooling they are having some fun with four Radeon HD 7970 cards and a lot of liquid nitrogen. The scores are off the chart, very little is shared on voltages and clock frequencies though, but pictures do say it all ;)
They used a LN2 cooled Core it 3960 clocked at 5643 MHz and then in quad-Fire they LN2 cooled the R7970 cards as well, resulting in an overclock of 1610 MHz on the graphics core with the memory at a blistering 1930 MHz (x4).
The clock frequencies vary per benchmark title though, the 3Dmark P score was run at 1530 MHz on the GPU core.
But that 3DMark Vantage P score of 83761 ... pffrrrt.
