DIYbanter - View Single Post - Why aren't computer clocks as accurate as cheap quartz watches?

wrote:

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

The computer batteries measure fine, at least 3.15V.

I thought that the problem was temperature swings in the computers
(25-38C), but a couple of cheapo watches taped inside the computers
kept better time.

Watches have a trimmer to adjust the frequency, but PC motherboards
don't, anymore. Some 286 and 386 motherboards had them, and could be set
to give fairly accurate time. I don't really care. I use software that
updates the clock from time to time and sets it to a few milliseconds
from the atomic clocks at NIST.

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Michael A. Terrell
Central Florida