Looks like power usage is high even when NICs are disabled. I remember this was also reported before. Can we assume that disabling NICs with jumper does not power them down?
It's not that high.
The test results above show where power drops about ~3-4 Watts, per NIC, that you disable via the jumpers.
- 71 W - All 3 NICs enabled
- 63 W - Only 1 NIC enabled
- 60 W - No NICs enabled
So, if you also take the 13 W for the BMC away, (and the 2W from the PDU/PSU always-on state of Supermicro/server systems), you are left with a system that would idle around 45 W - pretty much the exact same as a desktop version of the CPU series with 4 sticks of ram.
All in all, this is much more power efficient than sticking X540 PCIe cards in a board - as each PCIe Intel X540 would pull around 7-11W due to the onboard power regulators (which you get for free on the board already, with onboard components).
It's not the board or NICs that are power hungry, it's the BMC and Supermicro (and most others) PSU and PDUs in server chassis.
If you want lower power compared to a desktop, then disable BMC, connect it to a KVM (that uses power itself), and use a normal PSU.
If you want BMC, then you'll need to pay for it in watts. If you want the pretty 1U supermicro chassis, you'll need to pay for it in watts.
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Just to add onto that, my SC846 with a single X10 LGA2011-3 V3 CPU, quad mem ddr4 sticks, 1 x SSD - idles at 68 W with a single PSU/PDU and BMC. Disabling BMC (12 Watts) and using a straight ATX Platinum PSU, I see about 52 W. However, once you connect the backplane (9 Watts) and LSI9211-8i (11 Watts), now you are at 84 W with the SM PSU/PDU + BMC. That's before HDDs.