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Sandy Bridge overclocked VID and VCore explanation?

post #1 of 22
Thread Starter 
Hello,

I overclocked my sandy bridge (i5-2500k to 4.8 Ghz) with CPU voltage set to "auto" in BIOS. I can't put a fixed voltage in as it uses offsets or auto (MSI z77a-g41).

Below is my HWInfo during stress test. Notice my VID is around 1.431 and my VCore maxes out at 1.352....which one should I be concerned about? Does it look normal? I'm looking to run my overclock 24/7.

Also, the VIDs and clock speeds drop to 1.201 and 3300 mhz for a couple of seconds and goes back to 1.431 and 4800 mhz for a couple of seconds. Is this normal?


Edited by bond10 - 2/12/16 at 3:21pm
post #2 of 22
Quote:
Originally Posted by bond10 View Post

Hello,

I overclocked my sandy bridge (i5-2500k to 4.8 Ghz) with CPU voltage set to "auto" in BIOS. I can't put a fixed voltage in as it uses offsets or auto (MSI z77a-g41).

Below is my HWInfo during stress test. Notice my VID is around 1.431 and my VCore maxes out at 1.352....which one should I be concerned about? Does it look normal? I'm looking to run my overclock 24/7.

 

The VID is not the current voltage that's being supplied to your PSU. It's supposed to be the voltage that the CPU requests from the motherboard when the voltage is in a fully automatic mode (before vDroop). So, it usually doesn't matter what your VID is.

 

1.352V is the current voltage that's being supplied to your CPU, and that's a good voltage for this overclock - but only as long as it's actually stable (and I would bet that you will eventually find that it's nowhere near being stable).

 

Quote:
Originally Posted by bond10 View Post

Also, the VIDs and clock speeds drop to 1.201 and 3300 mhz for a couple of seconds and goes back to 1.431 and 4800 mhz for a couple of seconds. Is this normal?

 

It depends... what are you using for a stability test?

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post #3 of 22
Thread Starter 
Quote:
Originally Posted by TwoCables View Post

The VID is not the current voltage that's being supplied to your PSU. It's supposed to be the voltage that the CPU requests from the motherboard when the voltage is in a fully automatic mode (before vDroop). So, it usually doesn't matter what your VID is.

1.352V is the current voltage that's being supplied to your CPU, and that's a good voltage for this overclock - but only as long as it's actually stable (and I would bet that you will eventually find that it's nowhere near being stable).


It depends... what are you using for a stability test?

I'm running prime95 (blended) with HWInfo64 open.

VCore drops to 1.120 at 3300 mhz. Then it jumps to 1.312 at 4800mhz. It alternates between these two every 2 seconds in HWInfo64 (while running prime95)

Is there something else I should monitor?
post #4 of 22
Quote:
Originally Posted by bond10 View Post


I'm running prime95 (blended) with HWInfo64 open.

VCore drops to 1.120 at 3300 mhz. Then it jumps to 1.312 at 4800mhz. It alternates between these two every 2 seconds in HWInfo64 (while running prime95)

Is there something else I should monitor?

 

Oh wait, it's probably because you have two monitoring programs open at the same time. Close one and leave the other open.

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post #5 of 22
Thread Starter 
Quote:
Originally Posted by TwoCables View Post

Oh wait, it's probably because you have two monitoring programs open at the same time. Close one and leave the other open.

I did that around 30 minutes ago. I only have HWInfo64 open along with prime95.

Here's a screenshot of it when it's down to 3300 mhz (every 2 seconds)

post #6 of 22

I will have to wait to see if someone else replies who can explain what's happening because this is over my head. A screenshot of when it happens isn't going to help me.

 

Just for the sake of persistence, what are all of your settings in the BIOS?

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post #7 of 22
Thread Starter 
I followed this guide http://www.tomshardware.com/forum/265056-29-2600k-2500k-overclocking-guide

Everything default except

Disable:

Limit CPUID Maximum
Power Technology (I had to keep this enabled actually otherwise my CPU runs at stock speeds)
C1E Support
OverSpeed Protection
Spread Spectrum

Enable:


Internal PLL Overvoltage
Execute Disable Bit
Intel Virtualization Tech
post #8 of 22
Thread Starter 
Quote:
Originally Posted by TwoCables View Post

I will have to wait to see if someone else replies who can explain what's happening because this is over my head. A screenshot of when it happens isn't going to help me.

Just for the sake of persistence, what are all of your settings in the BIOS?

Below is my bios screens.

Another note is that my CPU is running at a constant 4.8 ghz until test 2 in prime95 where it drops to 3.3 ghz for 2 seconds, then 4.8 for 4 seconds and repeat.





For some reason clickBIOSII isn't showing a little extra info at the end:

1-core ratio limit: 48
2-core ratio limit: 48
3-core ratio limit: 48
4-core ratio limit: 48
Edited by bond10 - 2/12/16 at 6:17pm
post #9 of 22
It sounds like your CPU is turbo throttling. The voltage regulator on your motherboard is probably not up to the task of running Prime at 4.8 GHz. It was not designed to deliver enough power to the CPU socket when pushed that hard.

For monitoring, try using RealTemp. It will give you a more accurate look at what the multiplier is really doing. Throttling happens so rapidly that some monitoring tools just flip flop back and forth between 3.3 GHz and 4.8 GHz and don't show anything in between. Throttling is much smoother than that. There are a lot of multipliers in between those two that your CPU will be using when throttling.

With the motherboard you are using, there is probably not anything you can do to fix this. If you want to run Prime95 when you are fully overclocked, you will need a new board.
post #10 of 22
I use CPU-Z to monitor my vcore on my 2600K. And 4.8GHz with 1.352v is possible with a 2500k (no HT to compensate for). I'm running 4.7Ghz with 1.352v vcore while pushing 4x8Gb at 1866. I guess as long as you stress test and pass, you are good. I do 12hrs Prime95 and Intel Burn test to make sure.

OP, I see you have EIST enabled, but C1E disabled. C1E being disabled would keep your vcore at a constant. But EIST being enabled will allow the CPU to drop in speed. . If you want to allow the CPU to drop speed bins along with vcore, have them both enabled, which tends to be the norm for OCing as of late.

Or you can probably disable EIST and Turbo (you have C-States disabled already, so leave it that way), then use offset mode the same as setting the actual vcore. Then you just add the offest, go into Windows and see the actual, and keep adjusting that way until you are at the vcore you want. I would think it wouldn't fluctuate at all, and only drop with vdroop (i.e. loadline calibration).
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