What is a typical stable overclock for a VIA C3-M (Nehemiah, C5P) @ 800MHz \ VOGONS

What is a typical stable overclock for a VIA C3-M (Nehemiah, C5P) @ 800MHz

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First post, by red-ray

Posted on 2020-06-20, 22:29

red-ray Offline

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I was pondering how hard it was to change the multiplier on VIA Nehemiah CPUs and rather than ponder wrote a few lines of code. I was rather surprised when I was able to overclock my VIA C3-M (Nehemiah, C5P) from it's stock speed of 800 MHz (x6.0) to 1.53GHz (x11.5) 😀 With the multiplier set to x11.5 then the system seems 100% stable to the extent the CPU benchmark runs and I can generate the SIV save files. I tried setting x12 which resulted in a BSOD and when I set x13 the hardware just locked up and I needed to power cycle the system.

I am wondering do I have a "golden" chip or is this typical ?

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Reply 1 of 1, by tauro

Posted on 2025-01-02, 17:20

tauro Offline

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I have experimented with an onboard 1GHz Nehemiah C5P (EPIA-TC).
On Windows XP, 1.4GHz (10.5x) is perfectly stable. 11x results instantaneously in a blue screen.
On DOS 1463MHz (11x) works, while 11.5x crashes.
So I think you have a very good chip!

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