[davide155]

Originariamente inviato da Demetrius

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Q: Why can't I set CPU voltage above 1.55V (or even 1.45V), or below 1.1V on my Athlon 64? BIOS setup offers the voltages from 0.8V up to 1.7V. Is there a way to unlock these "hidden" voltages?

A: RMClock manipulates with VID and not directly with the CPU voltage. Maximal VID value you can set is dictated by the CPU itself (as indicated in the "Maximal VID" field of the General tab), as well as the Minimal VID. 1.55V is the absolute maximum VID for all Athlon 64 processors family; usually, maximal VID is even lower (e.g., 1.45V). There's no way to set current VID value higher than the maximal, as the CPU will choose maximal value instead (the same is true for FID, the bus clock multiplier). It is also impossible to program a VID being lower than the Minimal VID reported by the CPU. The voltage level you adjust in the BIOS is set in entirely different way, via direct manipulation with the CPU VRM and not involving VID changes. Please also note that the voltages you set manually in the BIOS setup cause the motherboard logic to ignore VID change requests, thus greatly diminishing power saving features of the AMD Cool`n'Quiet(tm) technology.


Q: CPU voltage indicated by RMClock greatly differs from the voltage reported by my vendor-supplied monitoring software. What's wrong?

A: Nothing. RMClock reports the CPU VID, i.e., just the requested CPU voltage level. It is up to the motherboard logic to decide whether this request should be handled or ignored. Most motherboards designed to properly support processor's power-saving features (e.g., AMD Cool`n'Quiet(tm) technology) should adjust the real CPU voltage so that it's close to the requested VID level. Other models may apply some extra over-voltage (e.g., +0.1 or +0.2V), which is useful for overclocking. Finally, there are many motherboard models that can be set up (via BIOS settings) to supply constant voltage to the CPU, which is far from being good for achieving significant power saving.

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