this post was submitted on 14 Jun 2026
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My ESXi box draws 20 watts at idle with 3 Windows VMs and 3 Linux VMs.
Guess which of those VMs draws the most power (hint: it's not Windows).
Power draw depends on more than the base OS, what it does matters so much more. Which is why my one Linux VM draws the most power - it gets used for some intense tasks with ffmpeg.
Interestingly. I've found little power draw difference using ffmpeg on Windows or Linux. Both will max CPU while converting and take a similar amount of time.
Idle windows is so damn heavy on io :(
Did you install the guest tools and set the CPU governor to the correct scheduler? Do the Windows boxes host the same applications as the Linux boxes?