It is a question. And I have the answer. I used an Ammeter to measure the power consumption of the 4-bay NAS system.

The NAS is built based on the U-NAS hardware.


  • CPU Model: Intel(R) Celeron(R) CPU J3160 @ 1.60GHz
  • Physical Memory: 8GB (original 3GB)
  • nic: enp1s0- >  2.5Gbe PCIe card.
  • HDD: 4 HDD -> 1.5TB, 4TB, 4TB, 8TB
4HDD and system Disk
4HDD and the System Disk

The SATA device C is the system disk, 64GB.

Based on the Google Search results, A Synology NAS will use 20-50 watts (2-bay), 40-50 watts for 8-bay NAS.

Mine is a 4-bay NAS, the system is just a vanilla Ubuntu 22.04.

The CPU is running under “ondemand” mode. Right now the CPU is just 576MHz.

davidyin@nas:~$ sudo cpupower frequency-info
[sudo] password for davidyin:
analyzing CPU 0:
  driver: intel_cpufreq
  CPUs which run at the same hardware frequency: 0
  CPUs which need to have their frequency coordinated by software: 0
  maximum transition latency: 20.0 us
  hardware limits: 480 MHz - 2.24 GHz
  available cpufreq governors: conservative ondemand userspace powersave performance schedutil
  current policy: frequency should be within 480 MHz and 2.24 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency: Unable to call hardware
  current CPU frequency: 576 MHz (asserted by call to kernel)
  boost state support:
    Supported: yes
    Active: yes

In 21 hours and 37 minutes, the total power is 0.7792KWh. So, the average is 36.05 watts.

Power Consumption of the NAS
Power Consumption of the NAS

I have not set up the standby on HDD. If I do it, I think the power consumption will be lower.


Let us do a simple math to see the power consumption:

  • NIC 2.5Gbe PCIe card: 3 watts
  • HDD WD15EADS: 4 – 7.4 watts
  • HDD WD40EFRX: 3.3 – 4.5 watts
  • HDD WD40EJRX: 4.5 – 5.1 watts
  • HDD WD80EFZZ: 5.2 – 6.4 watts
  • CPU J3160 TDP: 6 watts
  • RAM DDR3 8 GB: 3 watts
  • Motherboard etc: 6 watts

Total is about 35 watts to 41.4 watts. It is in the range of the measurement.





David Yin

David is a blogger, geek, and web developer — founder of If you like his post, you can say thank you here

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