PfSense server for small organisation
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Got the same, Asus AM1M-A, Athlon 5350, SSD
Best/Least I've managed is about 24,5W draw from wall socket (also using dual slot Intel Pro1000MT NIC).
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ECC, haven't managed getting it to work. Tried two different brands, had Hynix and Kingston's unbuffered ECC sticks lying around.
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FreeBSD, enabling CPU throttling leads to system crash (unless I disable C6 state in BIOS)
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No such issues under Linux but haven't seen lesser energy expenditure there either.
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Disabling one/two/three "cores" does not make any difference at all in power draw. Only undervolting works to an extent.
I could probably shave couple of Watts off by making the cooling passive (remove fan) but I am not sure it's worth the trouble. None of the big custom heatsinks seems compatible to fittings used with AM1 socket.
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