To overclock the Asus HD6970 Direct CU II today, we used SmartDoctor which Asus supply on the software disc. This allows for voltages to be increased.
Smart doctor is an application which can reside in the taskbar, much like MSI’s Afterburner software. At the bottom of the program are sliders which allow for VCore voltage increases and core clock and memory overclocking.
Yes, you didn't read the figures wrong. A 24 percent increase on the core to a mind blowing 1103mhz. Memory increased by just over 11 percent to 1528mhz (6112 mhz effective). Card temperatures only rose by 4c under load which is very impressive.
This huge manual overclock means that the ASUS HD6970 Direct CU II is able to outperform two overclocked GTX460 cards in SLi, the first time ever a HD6970 has achieved this in our labs.