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CoreV won't go up to what I set it to

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December 11, 2012 3:44:52 PM

Q9550 @ 3.2Ghz
GA-P35-DS3L (rev. 2.0)

I was running the IntelBurnTest 10 times for a quick stability test and I noticed that the CoreV is at 1.2498v under load, right under its VID of 1.25v.

After the tests end, the CoreV goes up to ~1.312v (idle CPU).

In the BIOS (F8 version since my Q9550 is C1), I have the voltage set as 1.35v for the sake of stability.

This is keeping me from getting my CPU up to 3.4Ghz: The voltage refuses to go up to 1.35v and causes my PC to lock up when I'm at 3.4Ghz.

What do I do?

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December 11, 2012 8:05:44 PM

Well the voltage dropping to 1.2498 during load from the idle of 1.312 is probably just vdroop as the processor is pulling power.

However, the voltages you see in windows; I wouldn't always trust them. Check your BIOS to see what types of voltages you're seeing in there. Second, if you're maxed out on the boards voltage; maybe you just can't toss more voltage to it?

I have noticed that different programs read voltages differently. Maybe switching to another program and trying to see what results they can give you. I use a few different ones personally to read the voltages/temps/fan speeds. The one that came with my motherboard, CPUID Hardware Monitor, CPU-Z, and once in a while I'll even pull up other software just to make sure.
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December 11, 2012 10:24:51 PM

CPUID HM
SpeedFan
CPU-Z
Core Temp

All say the same thing at idle and under load.

BIOS gives me a slightly higher voltage.

I've switched the voltage controls back to [AUTO] for now. This is what I had the last time I had this board and CPU at 3.4Ghz.

I'm going to test the CPU again and see what voltages I get.


EDIT: Idle is 1.31, load is still 1.294v

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a b à CPUs
a b K Overclocking
December 11, 2012 11:11:35 PM

Don't forget about that vdroop. My processor @ 4Ghz with 1.2v would drop to about 1.185 or so with max load according to CPUID Hardware Monitor. I don't run fixed voltage anymore so I don't have to combat with vdroop as much.

Either way, vdroop is normal. If you set to a higher voltage and the board doesn't reach it, then there is a problem somewhere.
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December 11, 2012 11:27:00 PM

Interesting thing:

Set the BIOS core V to the highest safest level for the Q9550: 1.365v

I now get 1.312v/1.328v idle and 1.296v under load.


Can I compensate for vdroop by setting the BIOS voltage higher than 1.365v or would that be too risky?
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a b à CPUs
a b K Overclocking
December 12, 2012 8:07:08 AM

I definitely wouldn't attempt to fight too much vdroop by rolling more voltage into it like that. What's the max voltage for that CPU anyways?.

Intel says "0.8500V-1.3625V" is the range so; I'd be wary pushing that much voltage into it.
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December 18, 2012 11:05:04 PM

Best answer selected by Wineclaw.
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