Steve wrote:
I have Now got power consumtion down to 15W when idle and 22W when running
That's EXTREMELY GOOD ! Not too much I could suggest to reduce power further, other than
a] disable all peripherals you don't need (even if not being used, leakage current adds to consumption): Serial, Parallel, USB, Audio, IDE (use SATA-only setting in BIOS if it's available);
b] remove the 64MB graphics card (run the NAS head-less).
And -- although it will increase power consumption -- although only minutely -- increase memory to 1GB or 2GB (2x512 or 2x1GB to preserve Dual-channel speeds). This will help during disk checks.
How are you booting ? Off HDD ?
If you are fanatical about reducing power consumption, you can either (without loss of performance) a] under-clock CPU (if BIOS allows) and/or b] use a less powerful cpu; and c] keep playing with more efficient PSUs. ***BUT*** I think you're already WAY down there ! Then again ... prove me wrong !
Georg