Everest and BIOS differences

A

Anneon

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Feb 1, 2008
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I have been using Everset on Vista x64 to tune my new system. My motherboard is a P35c-DS3R flashed to f9 bios. cpu is q6600 slacr.

My problem is that when i set the voltage in bios to say...+0.3v on the memory (1.8v default i think) or 1.4v on the core, Everest wil report the memory @ 2.0v and cpu @ 1.3v running desktop.

Now my memory is rated to run at 2.2v, at least guarenteed to not fail at that voltage and we know the quad can go to 1.5v nps. So which to believe, i don't want to fry nothing so i am erring on the cautious side at the moment. Have the chip running stable at 3.4GHz so i know i being a lil greedy wanting to go further but would be nice to know, any thoughts?
 
Bottom line, for a lot of reasons, mainly it is too costly to put high precision voltage regulation circuity on the board and secondly Intel requirement for Vdroop for CPU voltages to prevent heavy load changes from causing overshoot in the voltage regulation circuity that would exceed Intel ratings, what you set in the bios is not what you get. Everest is rounding off the math a bit it looks like as most utilities show those numbers out to hundredths x.xx of a volt.

[Actually the stock Intel Vid implementaion of cpu voltage adjustment with C1E etc. is very accurate allowing .01 volt steps in CPU voltage but again the implemention by the board manuf varies and once you go into the bios and start putting in manual settings the Vid scheme/controls are disabled ]

I would use a utility that provided better precision (speedfan with coretemp plug in) and set the bios to whatever is needed to deliver, read by speedfan, what you want.

The only truly accurate way to measure either voltage is with a digital voltmeter at the Vcc pin of the device itself while the board is running. Not practical for most of us.


edit:
This makes about the 4th post I have read where the current Gigabytes are undervolting the memory a bit. My old P965 is right on the money.
 
Gigabyte's not the only one. My MSI board does the same. 2.2V on the RAm in BIOS, speadfan reports 2.0V. CPU volts are about .02V low as well.

Good to have this question answered. I'm fine tuning my OC now and I may need that extra .2V on the RAM.
 
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