Review and overclock here:
http://en.expreview.com/2012/04/08/z...w/22203.html/5

"In the second overclocking test we remained unchanged memory frequency of 1802MHz, the core voltage rose to 1.35V and we conducted graphics core air-cooled overclocking test. After some tweaking and testing, the graphics core could be overclocked to 1.35GHz, the card scored P10738 in 3DMark 11, 9.55% higher than that of the default frequency.

What about the potential graphics core frequency in air-cooled condition would be? We tuned the memory frequency back to 1502MHz. and conducted overclocking towards graphics core, in the voltage of 1.35V, we successfully reached core frequency of 1.4GHz, at the time it scored P10785 in 3DMark 11 test.

Later, we tried higher core/voltage overclocking test, the score improved slightly in the GPU voltage of 1.375V, core frequency reached 1.41GHz, however, at that time core temperature had already been very high at around 95℃ ."