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iTunes
Our iTunes test is simply the encoding of a MP3 file into AAC.
The X2 255/250 once again stand out with low AAC encoding times and excellent
energy efficiency.
TMPGEnc
Our TMPGEnc test consists of encoding an XVID-encoded AVI to VC-1.
Most video encoding applications like TMPGEnc are multithreaded, so it is no
surprise to see the X4 630 lead the pack by a considerable margin. The X3 440
places second tied with the X2 555 — in some circumstances, extra cache and
a clock speed bump can overcome a higher number of cores. In terms of power
consumption, the X3 440 and X2 255 were a little more energy efficient than
expected.
HandBrake
A similar test to TMPGEnc, only this time encoding to H.264.
Programs like HandBrake that make better use of multiple cores, favor 3/4 core
processors heavily. Even the 2.5 GHz X3 705e and X3 415e performed well in this
test.
Benchmark Power Consumption
Our timed benchmark results multiplied by the average power consumption during
each test gives us an estimate of how much total power was used during testing.
When it came to how much power was expended performing our timed benchmarks,
the difference between the processors was small. The X3 435 had the highest
consumption at 35.72 watt-hours, but this was only 18% higher than the must
frugal CPU of the bunch, the X3 415e.
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