[time-nuts] PC clock generator without 14.318MHz

Mike Cook michael.cook at sfr.fr
Tue Oct 18 17:23:26 EDT 2016

> Le 18 oct. 2016 à 16:53, Vladimir Smotlacha <vs at 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.  

> thanks,
> 	Vladimir
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