Its not all about voltage. The fans I use pull 1.5A at 12V. I was expecting this to go up as I dropped the voltage. Surprisingly it also dropped. At 5v they only pull 0.3A. So at full power they use 18W however I run them at 1.5W. I don't have any solid number but I would guess they are moving roughly half the aiur they used too.
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CPU: Barton2500 @ 2.43 ghz
MB: NF7S Rev2
RAM: 2x 256mb Kingston HyperX 3500
HD's: 2x 160gb SATA RAID
GPU: Sapphire X800Pro VIVO -> XT Plat(softmod) 520/590
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