On 10/18/2016 11:23 PM, Mike Cook wrote:
Le 18 oct. 2016 à 16:53, Vladimir Smotlacha<v...@cesnet.cz> a écrit :
Hello,
I have operated own NTP servers with stable system clock for many years. The
principle is quite simple - I replaced 14.318 MHz quartz with OCXO based
circuit. Now I have to build few more servers with modern mini-ITX
motherboards, however on many of them (e.g. from ASUS) I can’t find any 14.317
MHz quartz. Such frequency is a relic of original PC design and I wonder if it
is used any other basic frequency in recent clock generators?
The 14.317MHz xtal was connected to the south bridge controller chip, but for
recent CPUs this has gone away as has northbridge and the system clock has been
integrated into the PCH (Platform Controller Hub) chip according to Wikipedia,
so I suspect that if you find the clock feeding that , then you could stabilize
it in that same way.
Thank you Mike, PCH will be object of my experiments.
I wonder than probably nobody solved stable clock source in "post
14.318" mainboards.
Vladimir
thanks,
Vladimir
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