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Problem with VID when OC cache

evo4ever86

evo4ever86

evo4ever86

Associate
Joined
6 Feb 2016
Posts
168
Location
Liverpool
Hello all.

I've just completed a Coffee Lake build specs below:

i7 8700K @ 5200MHz/5100MHz -1 AVX (yes im lucky ive got one :) )
ASUS ROG Maximus X Hero Z370
16GB Kingston HyperX Fury 3333MHz CAS16
250GB Samsung 960 EVO Polaris M.2 NVMe
2x 250GB Samsung 850 EVO RAID0
128GB Corsair Force GS SSD
Western Digital Purple 3TB HDD
[no GPU yet, ran out of money lol. I'll get it next month. I'll get either a 1070 Ti or 1080]

The problem I've got is when I OC the cache from 4400 to 4800 the VID on CoreTemp never drops below 1.2xx (roughly around that voltage) when the CPU idles, this adds a few degrees to my temps as well. However if I just leave the cache on Auto the vcore will drop to around 0.7xx and my temps drop too. Any ideas on how I can get the vcore to drop while the CPU is idle when OC'ing the cache? Many thanks!
 
Kieran said:
Sorry to hijack, but how did you manage variable voltage on this board? I played around with offset and adaptive and I just can't figure it out. Manual voltage I use 1.28v and LLC6. Can you suggest what settings for offset or adaptive to hit this same voltage? Any thing I've tried has brought me right up to 1.4v etc!
Click to expand...

I think you've misunderstood my post lol. I use a manual vcore of 1.360. Its just that it doesnt go down when I OC the cache when idle. What CPU ru using? and whats LLC6?
 
Kieran said:
With manual volts, the volts don't go down when idle. You need to use offset or adaptive voltage for that to happen. You don't need to be looking at your VID.. that isn't what volts your CPU is getting - just worry about the VCORE.

I'm using a 8700k and LLC is Load Line Calibration and on this board you can set it any where between 0-8 to stop vdroop.
Click to expand...

Ok. So im gonna need to know the stock vcore and then apply extra volts as the cpu turbos correct? In fact what is the stock vcore for the 8700K? And where do I find LLC? What does vdroop do and why is it useful? Sorry for sounding like a noob but I only know the basics of overclocking
 
An old but good article explaining vdroop is here: http://www.masterslair.com/vdroop-and-load-line-calibration-is-vdroop-really-bad

Essentially, the load line calibration setting causes the motherboard to increase voltage supplied to the CPU as load increases in order to counteract the safety measure implemented by Intel to avoid voltage overshoot when CPU load changes.
When LLC disabled, voltage value set in the BIOS is the maximum voltage supplied to CPU. When LLC is enabled, the voltage value set in the BIOS will be "average" value, with the actual min/max set according to the LLC level/motherboard implementation.
 
kaku said:
An old but good article explaining vdroop is here: http://www.masterslair.com/vdroop-and-load-line-calibration-is-vdroop-really-bad

Essentially, the load line calibration setting causes the motherboard to increase voltage supplied to the CPU as load increases in order to counteract the safety measure implemented by Intel to avoid voltage overshoot when CPU load changes.
When LLC disabled, voltage value set in the BIOS is the maximum voltage supplied to CPU. When LLC is enabled, the voltage value set in the BIOS will be "average" value, with the actual min/max set according to the LLC level/motherboard implementation.
Click to expand...

Thanks for the info. I'll try and use more advanced techniques to OC my CPU now. Hopefully can I keep thing stable.

EDIT: One last question, where about can I find LLC in the BIOS?
 
evo4ever86 said:
Thanks for the info. I'll try and use more advanced techniques to OC my CPU now. Hopefully can I keep thing stable.

EDIT: One last question, where about can I find LLC in the BIOS?
Click to expand...

Its usually under the CPU menu or the OC menu (called ai tweaker on ASUS and other things on other brands)

Cheaper boards tend to have LLC on/off rather than various steps of LLC. Use it carefully.
 
Ok. I've finally got Adaptive mode to boot into windows lol.

My settings in BIOS are:

+
Adaptive 1.355
Offset 0.001
=
1.356

CPUZ is showing 0.688 idle. Manual mode used to say 1.360 idle.

Have I got this right? I haven't done a stress test yet
 
Just tried to do a Cinebench run and it BSOD IMMEDIATELY! Got a feeling the adaptive voltage isnt being applied upon CPU load. It did reduce my temps tho on idle.

Has it got anything to do with LLC? I found AC Load Line and DC Load Line, are they the LLC settings?
 
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Right I got it working with LLC @ 1.00 but the vcore is all over the place as u mentioned. And its not very stable either. Ran 3 runs on Cinebench and got a BSOD on the 4th. I'm gonna stick with Manual for the time being unless ASUS fix it with a BIOS update.

EDIT: The only good thing I got out of it was lower temps.
 
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I hadn't even noticed the volts stay consistent with manual voltage set in the EFI, but it does indeed. My idle temps are still 24oC so meh... Is it really worth bothering changing for any other reason?
 
My temps r 22c idle manual vcore @ 5200mhz 1.355v. So I agree with u, pointless stressing over it when we both have good temps anyway.
 
I have -1 offset on AVX btw too (5100mhz)

EDIT: I use HandBrake quite a lot and it doesnt like 5200 @ 1.355v so thank god for offsetting AVX :)
 
I might de-lid my CPU and use liquid metal on the die. I'm already using liquid metal between the water block and heatspreader. I de-lidded my 7700K and it shaved off 20c on full stress, and shaved off about 10c on idle. Could do with the same for my 8700K. Reason being is it that my CPU is capable of 5300MHz but the temps are way too high! De-lidding should solve the problem.

EDIT: The only problem running @ 5300Hz is that it requires 1.400v is that a safe voltage for a 8700K just as long as the temps r low enough?
 
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evo4ever86 said:
I might de-lid my CPU and use liquid metal on the die. I'm already using liquid metal between the water block and heatspreader. I de-lidded my 7700K and it shaved off 20c on full stress, and shaved off about 10c on idle. Could do with the same for my 8700K. Reason being is it that my CPU is capable of 5300MHz but the temps are way too high! De-lidding should solve the problem.

EDIT: The only problem running @ 5300Hz is that it requires 1.400v is that a safe voltage for a 8700K just as long as the temps r low enough?
Click to expand...

I'd be very careful of that, if some squeezed out and made it into socket, bye bye CPU/Mobo
 
Don't worry I know what I'm doing, I done it to my 7700K without any problems. I well aware of the liquid metal spewing over the die once in contact with the heatspeader
 
Don't worry I know what I'm doing, I done it to my 7700K without any problems. I well aware of the possibility of the liquid metal spewing over the die once in contact with the heatspeader.

EDIT: I'll buy one of those de-lidding tools this time. I used a stanley knife last time lol. Should I get some thermal epoxy adhesive to apply around the edge as well? I didn't used any on my 7700K... probably a big mistake doing that but nothing bad happened as I the socket holds it in place once mounted.
 
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evo4ever86 said:
Don't worry I know what I'm doing, I done it to my 7700K without any problems. I well aware of the possibility of the liquid metal spewing over the die once in contact with the heatspeader.

EDIT: I'll buy one of those de-lidding tools this time. I used a stanley knife last time lol. Should I get some thermal epoxy adhesive to apply around the edge as well? I didn't used any on my 7700K... probably a big mistake doing that but nothing bad happened as I the socket holds it in place once mounted.
Click to expand...

There's no problem glueing the IHS back on, it does make things easier if you're ever removing CPU for whatever reason. My 2 systems both just had the clamp holding it on but next time I'm dismantling I'll prob glue it on.
 
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