Overclocking Results

The days of overclocking by simply increasing the BCLK are gone with the new Sandy Bridge processors. Some initial hardware reviews are only seeing single-digit percentage increases in performance by using older overclocking methods. The K series LGA 1155 processors have unlocked CPU multipliers, which seem to be the preferred way to get more performance out of these cores in turbo mode.

The new EFI BIOS gives users plenty of overclocking options, but there aren’t that many things we recommend users change in the BIOS to ensure they see at least a 1GHz or more increase in performance. Here’s what we did to help us get the best overclock possible with the P8P67 Pro. 

We went into Advanced Mode in the ASUS EFI BIOS Utility and made the following changes:

  • Left BCLK frequency at 100

  • Increase CPU Ratio (The math for overclocking our i5-2500K is very simple because we just multiply the BCLK frequency (100) and the CPU Ratio (currently 45) to get the overall CPU speed (4.5GHz)

  • Manually adjusted DRAM frequency to DDR3-1600

  • Adjusted DRAM voltage to 1.65v


After making the changes above in the BIOS, I began using ASUS’s Turbo EVO software in Windows 7 to incrementally increase the CPU ratio. I started out at 40x, but quickly realized the P8P67 Pro in tandem with the i5-2500K could handle more. I increased the CPU ratio to 45x and finally started seeing the core sweat a bit during stability testing. At 48x, we began to see the core fail during stability testing. After backing it down a bit, we were able to get a stable 4.613 GHz overclock.


ASUS P8P67 Pro LGA 1155 ATX Motherboard Review - Motherboards 72
This screenshot was taken when we achieved a 4.613GHz overclock on the ASUS P8P67 Pro

CPU Speed BCLK CPU Multiplier DRAM Frequency DRAM Timings CPU Voltage
4.613GHz 100.3MHz


1640 MHz 8-8-8-24 1T 1.325v

Overclocking Results

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