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That's correct, you can't set the CPU ratio higher than the stock multiplier, however, like you mentioned in your reference of our manufacturer reply to a Newegg post, P67 boards do not overclock by increasing the CPU ratio but rather by increasing the "Turbo Ratio". The Turbo Ratio option has been in the AI Tweaker tab of the UEFI BIOS since the P8P67 LE board was released. AI Tweaker tab -> set "Turbo Ratio" to "By Per Core (Cannot Adjust in OS)" -> this will give you 4 entry fields: 1-Core Ratio Limit, 2-Core Ratio Limit, etc. Set each of these to 44 for example. You're correct in that there is no manual vCore setting for this board, however you do not have to rely on Auto as there is an offset vCore option. Using offset voltage can actually be advantageous and is quite conducive to overclocking. With offset vCore the VRD will scale down during idle states helping to extend the life of the VRM area due to less voltage and less stress. This will also lower the temps. and could increase the lifespan of your CPU. You can also enable load-line calibration to compensate for under/overshoot and Vdroop.
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