Asus uses identical UEFI interfaces for both the EVO and Premium models of its P8P67 product line.
We actually like using Intel's Turbo Boost to overclock Sandy Bridge processors, since it allows our system to save tens of watts as it idles. Yet, Intel’s multi-step plan is designed to keep its CPU within a relatively small thermal and power envelope, and higher performance can be achieved by picking a single Turbo Boost ratio for all loads.
Choosing a 1.345 V core setting with “Extreme” load-line calibration keeps our fully-overclocked processor at 1.35 V under full load when using the P8P67 Deluxe. The EVO requires a slightly lower 1.340 V setting to achieve similar results.
Asus adds DRAM reference voltage to its assortment of voltage controls. CPU Core, CSA, VTT, and PLL voltage levels are all adjustable.
Asus’ memory timings menu is a little more complete than ASRock’s, and Asus doesn’t force users to make two adjustments to control a single setting.
Overclockers also have the option to increase base frequency. You may or may not know that non-K-series SKUs have access to a limited range of multiplier settings above the stock ratio, so long as you use them on P67-based motherboards. The CPUs can run at up to four bins faster, and then Turbo Boost up to four more bins when only a single core is active. Access to that lets these boards enable a modest overclock, even if you didn't splurge on a completely unlocked Core i5 or Core i7.