Anyone familiar with overclocking a Nehalem based CPU will quickly and easily find the limits of their CPU and cooling with the ASUS P7P55D Deluxe. Simply change Ai Tweaker to manual, dial in a healthy dose of BCLK (I suggest starting at 166), disable turbo mode, set a multiplier somewhere in the 18-20 range, feed about 1.35v into the CPU and let ‘er rip! This time around we decided to not be so stingy with the IMC voltage and boosted it to 1.225v.
Our overclocking results were very good. Though we still run into a thermal limit at around 4GHz, we were able to get the BCLK up to 210MHz! A base clock of 215Mhz was the highest we were able to boot and enter Windows with, but it was far from stable.