Sorry for the late reply, I received quite a few messages here and on Reddit.
Since a lot of people have asked how I managed to get my system down to 6 watts, here are my BIOS settings and hardware setup.
First off, let me tell you right away:
you won't hit 6 watts without the right power supply!
I tested three different PSUs:
- PicoPSU with a Leike power brick
- The PSU that came with my Chenbro NAS case
- A regular 850W desktop PSU
Only the PicoPSU combined with the Leike power brick was able to reach 6 watts. All the others were noticeably higher.
The PicoPSU with the Leike adapter — along with the Corsair RM550x from around 2019 — is often recommended for ultra-low power consumption setups.
So your first step should be testing which power supply gives you the lowest idle power draw.
All my measurements were taken using a Tasmota smart plug.
Next point: I did all my tests using
just a USB stick running Unraid — no hard drives, no additional hardware like extra NICs, etc.
Once you find your minimum baseline power usage, you can start gradually adding your actual hardware how much each component adds. Some hardware doesn’t play nicely with power saving and will prevent ultra-low consumption.
Regarding the BIOS: I spent a lot of time tweaking settings and disabled everything I didn’t need.
Pro tip: some BIOS settings don’t actually stick after saving — when you go back in, they’ve reset. To avoid that, save your configuration as shown in my screenshots using
“Save as User Default”, then choose
“Save and Exit” or
“Save and Restart”.
When you re-enter the BIOS, just choose
“Restore User Default” and all your settings will be restored.
This is especially important for the
ASPM (Active State Power Management) settings under
PCI Express Root Ports 1–12, which tend to reset.
Since I upgraded my RAM today from 8GB to 16GB, I took the opportunity to snap some BIOS screenshots for you.
Here’s my current setup:
- Purple CWWK N100 board with 16GB RAM
- 1x GbE LAN, 1x USB stick for Unraid
- PicoPSU 75W with Leike 60W power brick
- 1x 2.5" SSD, 128GB
- 1x 2.5" HDD, 1TB
- Full Passive no Fans!
Right now, my Unraid system draws
around 10W at idle/light load.
The screenshot shows 20W, but that includes ~10W for the
FritzBox and the fiber ONT — I have everything (server + network gear) plugged into the same power monitor.
I used ChatGPT to translate this, so I hope everything is clear — feel free to ask if anything’s unclear!