somebody wrote
Why do the battery powered clocks in personal computers tend to keep
worse time than quartz watches, even the $1 ones?

Who is the manufacturer? I only use Gigabyte(mostly) or MSI (sometimes)
motherboards. I find the clocks to be reasonably accurate. My guess
would be that the OEM didn't ground the crystal case or use the proper
guard ring techniques for noise reduction. Do you find that they run
fast or slow?