[Dprglist] Stability of CPU oscillator

[Kipton Moravec]

Look at a GPSDO GPS Disclipined Oscillator if you need more accuracy 
(and more cost)

https://en.wikipedia.org/wiki/GPS_disciplined_oscillator

Some quick examples in the $50 to $80 range. 10 MHz

https://www.digikey.com/product-detail/en/mikroelektronika/MIKROE-1032/1471-1009-ND/4495374?utm_adgroup=Evaluation%20Boards%20-%20Expansion%20Boards%2C%20Daughter%20Cards&utm_source=google&utm_medium=cpc&utm_campaign=Shopping_Product_Development%20Boards%2C%20Kits%2C%20Programmers_NEW&utm_term=&utm_content=Evaluation%20Boards%20-%20Expansion%20Boards%2C%20Daughter%20Cards&gclid=Cj0KCQjww_f2BRC-ARIsAP3zarGwf8Rd71SgPkxbg_0s2pf5COe-2X_HmcmN8cce9yr8Wgjz1RYF7v0aAn3cEALw_wcB

https://www.digikey.com/product-detail/en/sparkfun-electronics/GPS-11858/1568-1151-ND/5673737?utm_adgroup=RF%20Evaluation%20and%20Development%20Kits%2C%20Boards&utm_source=google&utm_medium=cpc&utm_campaign=Shopping_Product_RF%2FIF%20and%20RFID_NEW&utm_term=&utm_content=RF%20Evaluation%20and%20Development%20Kits%2C%20Boards&gclid=Cj0KCQjww_f2BRC-ARIsAP3zarGq8wQ9V83W1qbV6_vM8a6ndNj-zvWG1dwi5Rn1boW5lpTu2B_BTpkaAohUEALw_wcB

No prices but you can find them probably on Mouser or Digikey.
https://www.microsemi.com/product-directory/clocks-frequency-references/3826-gps-disciplined-oscillators-gpsdo

Finally you can see what is at EBAY when looking for a 10 MHz reference.

https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313.TR3.TRC2.A0.H0.X10+MHz+reference.TRS0&_nkw=10+MHz+reference&_sacat=0

Kip

On 6/4/20 9:55 PM, John Swindle via DPRGlist wrote:
> Folks:
>
> What is the typical stability of the oscillator in a consumer x86 
> platform?
>
> I don't find that specified for systems, or I don't know where to look 
> for the spec. The part numbers on the crystal often don't seem to be 
> sufficient to find the stability in the XTAL datasheet.
>
> I don't have access to test equipment to measure it.
>
> I appreciate any help, but just to be clear: I'm asking about the 
> stability, not the accuracy, so it would be ppm of drift and/or jitter 
> over time, not ppm of accuracy.
>
> I intend to use the invariant TSC in x86 processors, but if the 
> oscillator is not stable, then the invariant TSC numbers will not be 
> as useful to me.
>
> Thanks.
>
> John Swindle
>
>
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