FalconFly
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As I'm (naturally) spending alot of time, testing and attention to creating lowest-power Systems with optimal performance, here's my recommended AMD config :
Athlon X2 BE-2400 (2x 2.3GHz, 45W TDP) AMD 480/480X or 580/580X Chipset ( if below-par USB performance isn't a show-stopper, most power-efficient AM2 Chipset existing I know of) Seasonic S12II 330W (most power-efficient PSU I know of)
Depends on the power consumption of your Drives, but with a single 2.5" SATA Drive and PCI VGA installed, you're looking at ~67W power consumption at full CPU load with Cool&Quiet even disabled.
Idle power with Cool&Quiet enabled is far below that for this config.
The AsRock AliveXFire-eSATA2 is currently my Board of choice, already has BIOS support for the Phenom X4 (so far, I haven't read of any significant performance loss of AM2 vs. AM2+ , and the newer AM2+ Chpsets currently draw significantly more power than the AMD480X, for example).
A good alternative is the AMD690G/V Chipset, approx. 10W higher Power consumption, but still below any stand-alone PCIe VGA Card (plus a normal USB performance).
Besides the CPU (which power rating most people are aware of), the biggest power-hogs are Video Card, Motherboard Chipset, inefficient Power Supply and fast Harddrives.
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