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When idle or playing H.264 video, the P8H67-I used slightly more power than previously tested H67 boards, including its chief rival, the Zotac H67-ITX. However as the load increased, the Asus board began to pull away, using 1W less when two instances of Prime95 were running, and then a massive 12W less when all four instances were running.
Unfortunately it is difficult to ascertain exactly how much of the energy draw is generated by the processor alone, as the amount of power pulled from the AUX12V connector depends on how power regulation has been implemented by the manufacturer. In this case Asus has apparently gone with a 4+2 power phase design which pulls quite a bit of juice from the 4-pin connector, while the H67-ITX uses significantly less, drawing a substantial amount of power from other sources.
To test the board's cooling, we used a Core i5-2500K stressed for ~15 minutes with Prime95. Temperatures of the boards' chipset and VRM heatsinks (if applicable) were recorded using a spot thermometer. The highest temperatures were taken for comparison.
On the P8H67-I, the external heatsink temperature was 30°C above ambient over the PCH portion while the area over the VRMs was 7°C warmer. The H67-ITX's heatsinks are noticeably larger, and its PCH heatsink did run marginally cooler. However, the VRM heatsink was considerably hotter due to the inefficiency of the board. As we noted in our H67-ITX review, it applies an unusually high core voltage to the processor.
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