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On light load, the A8-5600K and F2A75M-D3H is one of the most energy efficient desktop combinations we've encountered, hitting 17W DC when idle, an astonishing 5W improvement over the ASUS F2A85-M Pro.
On heavy load, the scales tip in the opposite direction, with the F2A75M-D3H using 2W more compared to the F2A85-M Pro when encoding video with TMPGEnc and running synthetic CPU and GPU stressors.
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
AUX/EPS12V connector depends on how board power regulation has been implemented. As a proportion of total system draw, the AUX/EPS12V draw on the F2A75M-D3H was noticeably higher than the ASUS F2A85-M Pro. This typically indicative of a more simplistic voltage regulation design that also correlates with better efficiency under low load.
To test the board's cooling, we stressed the CPU for ~15 minutes with Prime95/CPU Burn. Temperatures of the boards' chipset and VRM heatsinks (if applicable) were recorded using a spot thermometer. The highest temperatures were taken for comparison.
As the F2A75M-D3H lacks a VRM heatsink we recorded the temperature of the hottest exposed chip instead, so naturally it was substantially higher though we didn't encounter any stability issues (we've also seen much worse temperatures in the past on exposed VRMs). The FCH heatsink did a fairly good job however, running somewhat cooler than the F2A85-M Pro.
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