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The Asus P8P67/Pro were compared with other LGA1155 boards using a Core i5-2500K processor at stock settings, with energy saving features enabled, and overclocked. As P67 requires a discrete graphics card, we used an AMD Radeon HD 5450, which has a fairly low power draw.
Power Consumption: Core i5-2500K
The P8P67 used approximately the same amount of power as the Gigabyte's P67A-UD4, while the Pro version used 3~4W more on load. This was likely caused by the higher core voltage assigned by the Pro. Despite the similarity of the two boards, for whatever reason (perhaps simple sample variance), the non-Pro gave the chip about 0.016V less by default. In any event, the Intel DP67BG retains a slim edge in P67 energy efficiency.
The Asus EPU feature lowered the core voltage by a healthy 0.064V resulting in moderate power savings, though only on load. Of course you can mimic EPU's effect by setting a CPU offset voltage in the BIOS manually.
We measured a surprisingly low amount of energy being drawn from the AUX12V connector from both Asus boards, suggesting that the two pull more power from the ATX12V port than other boards. They apparently have a similar power regulation design to the H67 based Asus P8H67-M EVO which exhibits similar behavior, though the H67 model uses more on load, possibly due to the higher efficiency DIGI+VRM of the P67 boards.
Power Consumption: Core i5-2500K, +0.12V above stock, 4.0 GHz (with Turbo Boost on four core load)
When overclocked by 700 MHz and overvolted by 0.12V, both P8P67 and P8P67 Pro used a bit more power on load than the Gigabyte P67A-UD4. The Intel DP67BG once again came out on top in this test, drawing about 5W less on average across the board.
Perhaps the most interesting implication from these results is that even if the P67 board in question uses offset overvolting (overvolting both at idle and on load), as the P8P67 series and P67A-UD4 do, it doesn't affect idle power consumption. So even if you overclock to gain performance, there is no extra power penalty at idle.
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