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As we noted in our AMD Trinity review, the new platform is very energy efficient under light load. Paired with an A8-5600K, the F2A85-M Pro had an idle draw of only 22W. Playing a 1080p H.264/MKV video brought that figure up to 27W and a 1080p Flash trailer on YouTube used 30W. It's a noticeable improvement over the Llano/A75 combination.
Synthetic loads using Prime95/CPUBurn and FurMark were also much lower than the Llano configuration but in a real life stress test, video encoding with TMPGEnc, the A8-5600K/F2A85-M Pro pairing only consumed 5W less.
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.
On this board, ASUS has gone with an 4+2 power phase design which pulls substantially less power from the 8-pin connector than the Gigabyte A75M-UD2H FM1 (4+1 design) we tested with the Llano APU.
As a proportion of total system draw, the AUX/EPS12V draw on the F2A85-M Pro was approximately 34% less and 8% less on light load and heavy load respectively, compared to the A75M-UD2H.
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.
Cooling on the F2A85-M Pro is not great, but adequate. The Sandy and Ivy Bridge combinations included above use a bit less power and have larger VRM heatsinks so they run quite cool compared to the FM2 board. It does compare favorably to the A75M-UD2H though probably because the A8-3850 has an insanely high load power draw.
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