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Sandy Bridge overclocked VID and VCore explanation? - Page 2

post #11 of 22
Thread Starter 
It throttles down to 3300 in prime95 even when I'm OCed to 4000 ghz

However, so far after playing GTA V for a couple of hours, there has been no throttling at all.

I tried disabling EIST and turbo but I'm still getting the same results. My CPU voltage offsets options are: auto, 0.02+, 0.04+...all the way up to 0.16+....is that enough?
post #12 of 22
Thread Starter 
Quote:
Originally Posted by unclewebb View Post

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.

Which RealTemp should I use? There's three: RealTemp, RealTempGt, and i7TurboGT

Also, I'm fine with it throttling in prime95 as it's not downclocking in any of my games. I'm after better gaming performance afterall (for my CPU intensive games). Is it safe for 24/7 use?

Edit: I used i7TurboGT as it was looking at my core usage instead of just temps. The results are below. It just instantly switches between 48 and 33 for multiplier.


Edited by bond10 - 2/12/16 at 9:11pm
post #13 of 22

It's safe as long as it's stable because the voltage is nice and low. If it's not stable though, then it could eventually result in gradually worsening problems with your computer (like in Windows) over time.

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post #14 of 22
Thread Starter 
Quote:
Originally Posted by ericeod View Post

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).

I've enabled C1E. Now my VCore drops to 1.024 while clock speeds are 1600 mhz when idling. It goes back up on loads.

Having both C1E/EIST enabled or disabled doesn't change my throttling. I'll leave them on since it's nice to not use full power when idling I guess.
post #15 of 22
Thread Starter 
Quote:
Originally Posted by TwoCables View Post

It's safe as long as it's stable because the voltage is nice and low. If it's not stable though, then it could eventually result in gradually worsening problems with your computer (like in Windows) over time.

What do you mean by "stable"? Voltage readings? I just ran the Intel Burn test and it passed. It throttled speeds from 48 to 33 towards the end (around 7th test). Temps didn't exceed 74 C and VCore didn't exceed 1.336.
Edited by bond10 - 2/12/16 at 10:11pm
post #16 of 22
Quote:
Originally Posted by bond10 View Post


What do you mean by "stable"? Voltage readings? I just ran the Intel Burn test and it passed. It throttled speeds from 48 to 33 towards the end (around 7th test). Temps didn't exceed 74 C and VCore didn't exceed 1.336.

 

Stable means your system is stable. Intel's default test isn't a good test for stability at a high overclock at all. It's probably not even good period because in order to be good with these CPUs, it needs to use the AVX instruction set, and Prime95 v27.7 and later does.

 

With Prime95's Blend test, there are 82 different FFT sizes and each one is very different and it takes about 24 hours to get through all 82. So, if your computer can run that test for 24 hours without any problems whatsoever, then you could call it stable. If you want an even more difficult test for your computer to pass, then use "Custom" in Prime95 (click it while the Blend test is selected). With this test, you get to tell Prime95 how much of your memory to use, and this makes it much harder on the CPU which is a good thing because the memory controller is on the CPU. 24 hours of Custom Blend would pretty much indicate true stability.

 

If you don't test your computer's stability at 4.8 GHz, then you'll be asking for trouble later on down the road. So, I hope you don't decide to give me the chance to tell you in a few months that I tried to warn you. ;)

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post #17 of 22
Thread Starter 
got it, i'll let it run for a day.
post #18 of 22
Thread Starter 
Alright, after letting it run for 24 hours, I've been stable (temps under 70, VCore maxes at 1.352, VID maxes at 1.431). There is the downclocking to 3300 mhz for 2 seconds (stock level) for every 4 seconds of 4800 mhz. Are you sure I can ignore VID? It's way higher than than VCore.
post #19 of 22
Quote:
Originally Posted by bond10 View Post

Alright, after letting it run for 24 hours, I've been stable (temps under 70, VCore maxes at 1.352, VID maxes at 1.431). There is the downclocking to 3300 mhz for 2 seconds (stock level) for every 4 seconds of 4800 mhz. Are you sure I can ignore VID? It's way higher than than VCore.

VID is not the actual voltage you are running, it is a pre-programmed parameter built into the chip. It used to be reported at a constant, and was an indication of stock voltage at default clock speeds (no 2 CPUs are alike). For example, the VID stated by intel for a CPU can be 1.125v to 1.35v. This means the specific CPU can have a default voltage anywhere in that range. You and I could have the same CPU, but mine might run at default of 1.125v while yours might run at 1.25v. With the Sandy Bridge, the way to see your default VID, and specifically the default vcore at stock, is to run your bios at default (no OC) and see what is reported by Core Temp.
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post #20 of 22
Thread Starter 
Quote:
Originally Posted by ericeod View Post

VID is not the actual voltage you are running, it is a pre-programmed parameter built into the chip. It used to be reported at a constant, and was an indication of stock voltage at default clock speeds (no 2 CPUs are alike). For example, the VID stated by intel for a CPU can be 1.125v to 1.35v. This means the specific CPU can have a default voltage anywhere in that range. You and I could have the same CPU, but mine might run at default of 1.125v while yours might run at 1.25v. With the Sandy Bridge, the way to see your default VID, and specifically the default vcore at stock, is to run your bios at default (no OC) and see what is reported by Core Temp.

So there would be no risk in my set up where the VID is way higher than the VCore as long as it's stable and temps are good. It was just freaking me out because if the chip requires 1.421 voltage but only 1.352 is being supplied, I figured this would be unstable and cause my computer to shut down sometimes due to not enough voltage. Also, is there a rule for 24/7 set ups? I've heard of this term and can't figure out what the difference is between a 24/7 and a benchmark set up. Is 4.8 ghz (my max without crashing and stable on prime95 for 24 hours) a benchmark set up or 24/7?

Thanks for all your help btw.
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