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Where do I measure the vCore with a multimeter? (ASUS P8Z77-V Pro)

post #1 of 12
Thread Starter 
I'm trying to figure out whether I need to RMA my CPU (i5-3570k) or my motherboard (ASUS P8Z77-V Pro). The reason being I need 1.375v to hit 4.5GHz but with my Antec Kuhler 620 the temps are only in the 75c range after an hour of Prime95. Looking at data from other i5 owners, my temps are similar to what someone with an H100 would get at about 1.25v. So it has to be one of two things, this CPU is brand new and is from a new batch from Intel that is different than the majority of i5-3570k's on the market. Or my motherboard is giving me an incorrect value you vCore. I just got a multi-meter and am unsure where the correct measuring point is. I've read if you're not careful you can potentially short the board or the chip. I'm not a rich man so I would like to avoid that!
post #2 of 12
CPU-Z gives a fairly accurate reading of vcore. Just start it while running Prime95
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post #3 of 12
Quote:
Originally Posted by Legonut View Post

CPU-Z gives a fairly accurate reading of vcore. Just start it while running Prime95

Nothing close to accurate with some boards.
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post #4 of 12
More likely that your chip just has better than average chip to IHS contact. It's not that your temps are that great, but that everyone else's are crappy - which is why deliidng works so well.
post #5 of 12
Thread Starter 
I mean obviously I've been using software to get my current vCore, I use CPU-Z, HWinfo64, AI Suite, and look in the BIOS. All of them are the same. Since I run 1.365v and my temps are similar to someone running 1.25v with a better cooler, I thought perhaps my motherboard was giving out the wrong information.

I figured out how to probe the board and it reads exactly the same as all other software and BIOS. So my conclusion is that this is a funky batch of i5-3570k's. Perhaps the had to get more on the shelves with the holidays and black friday coming up so they took some that didn't quite pass and modified the IHS to make better contact. Or they just made a funky batch that needs more vCore but can maintain lower temps? IDK, but it works and its 4.5GHz @ 1.375v and cool as the other side of the pillow so I'm not too worried anymore...thumb.gif
post #6 of 12
I have my 3570K at 4.5Ghz with 1.34v (3.6 set in BIOS).

I get around 70C.
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post #7 of 12
Thread Starter 
Quote:
Originally Posted by DeXel View Post

I have my 3570K at 4.5Ghz with 1.34v (3.6 set in BIOS).
I get around 70C.

When did you purchase this chip and do you know the batch number?
post #8 of 12
Launch day biggrin.gif.

L204B361. So just bad chips.
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post #9 of 12
Thread Starter 
Quote:
Originally Posted by DeXel View Post

Launch day biggrin.gif.
L204B361. So just bad chips.

Or we just have good IHS to die contact.
post #10 of 12
Easiest way to measure vcore with a DMM is if you have access to the back of the board while it's running.

I don't have your board to test myself, but from looking at this image ( http://www.tech-kings.net/home/images/stories/motherboards/ASUS-P8Z77-V-PRO/bottom1.JPG ) I think I can find a place to start.

See the five rows of four columns of capacitor terminals to the side of the CPU back-plate (between the socket and the vertical VRM heatsink)? Measure the voltage from the column closest to the CPU back-plate and if it's close to what's reported in CPU-Z at the same moment/load, that's your vcore (one of the rows might be VTT, VCCSA, or PLL).

You can also try measuring the surface mount capacitors or resistors in the gap in the center of the back-plate, but this is usually more difficult.

Edit: actually, those solder pads between the terminals and the back-plate may have been put there specifically for measuring vcore.
Edited by Blameless - 12/3/12 at 6:06pm
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