High VRM temp makes OC unstable

mrthanhnguyen · Feb 20, 2020

My z390 prime a vrm hits 90c during stress test while my cpu stays 70c-75c. Does it cause my oc unstable? I don't see any option to water cool it. Do put a vrm fan help or just buy a new mobo?

lexluthermiester · Feb 20, 2020

mrthanhnguyen said:
My z390 prime a vrm hits 90c during stress test while my cpu stays 70c-75c. Does it cause my oc unstable? I don't see any option to water cool it. Do put a vrm fan help or just buy a new mobo?

Those temps for VRMs are fine. Most VRMs, even the low quality ones, can withstand 130C nominal and 160C spikes without damage. However, mounting a heatsink/fan to them can't hurt.

Zach_01 · Feb 20, 2020

First you spend 5~15$ for a fan over VRM, and if not work then spend, X10~20 the amount of fan money for a new board...

oxrufiioxo · Feb 20, 2020

mrthanhnguyen said:
My z390 prime a vrm hits 90c during stress test while my cpu stays 70c-75c. Does it cause my oc unstable? I don't see any option to water cool it. Do put a vrm fan help or just buy a new mobo?

Seems the board is just pretty meh vrm wise for a 9900k

4 phase with 8 45 amp power stages. The Maximus Hero/Code/Formula all have pretty weak Vrms compared to other similarly priced high end boards as well.

Not sure about if that's enough to make your OC unstable but on boards with shittier vrms you sometimes need more vcore to keep a stable overclock on high wattage chips.

5.2ghz is pretty difficult even on a KS chip according to silicon lottery depending on the type of workloads you're running.

Also if you're not crashing I wouldn't worry about it unless you were hitting 110C under heavy load on the VRMs

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joemama · Feb 20, 2020

You really should have bought a better board for the 9900KS, but it is still fine to use this board as long as no problem occurs, though the service life of the board might be shorter.
You can put a fan to help cool it if you want

mrthanhnguyen · Feb 20, 2020

I passed 8hr of realbench, 1hr occt large with avx , but fail occt linpack 2019 within 10m. Im so lazy to buy a new board coz I need to drain the whole loop then install 2tb games.

oxrufiioxo · Feb 20, 2020

mrthanhnguyen said:
I passed 8hr of realbench, 1hr occt large with avx , but fail occt linpack 2019 within 10m. Im so lazy to buy a new board coz I need to drain the whole loop then install 2tb games.

What are you primarily using your pc for?

Also are you stable at 5.1ghz in occt linpack 2019? You may just need an avx offset of like 2-300Mhz

mrthanhnguyen · Feb 20, 2020

Stable 5.1 with linpack. I just game.

eidairaman1 · Feb 20, 2020

Watch and interpret these.
VRM Tutorial by @buildzoid

Asus Z390 Prime-A breakdown, also by @buildzoid

mrthanhnguyen said:
Stable 5.1 with linpack. I just game.

delshay · Feb 20, 2020

Perhaps 17 W/mk thermal pads can help. Look to Fujipoly or Alphacool.

oxrufiioxo · Feb 20, 2020

mrthanhnguyen said:
Stable 5.1 with linpack. I just game.

Probably more your chip not liking 5.2 vs your vrm being an issue.

XL-R8R · Feb 20, 2020

The difference between 5.1GHz and 5.2GHz for anything outside of benchmarking, is very minimal.

Save yourself the mental ache and be happy with your totally stable 5.1GHz and call it a day - unless you wish to shove ungodly amounts of voltage at the CPU or spend money on a new board and get to draining that loop and maybe gaining 100MHz for your money/effort - keep what you have and smile. :toast:

JackCarver · Feb 20, 2020

If it‘s only in Linpack and use case is gaming then there is no problem as you are stable during gameplay. What is the problem in Linpack, does CPU throttle or do you get blue screens or error messages? Usually most boards throttle down cpu if vrm gets too hot to avoid damaging vrm. If your cpu run Full Speed and Linpack fails it‘s rather a problem with too low voltage to get stable there. Also worth to take into account is that mosfets can‘t handle their max capable current over the whole temperature curve. The hotter they get the less capable they are with current load, so active cooling would rise their current capability. A rear fan intake lowers vrm temps up to 10C according to measurements.

EarthDog · Feb 20, 2020

1. Those vrm temps are fine. Cooler is always better. Spot cool and/or replace thermal pads.
2. Why are you stress testing with multiple tests?? Passing two but not a third (which that third is overkill). Is your pc mission critical status? You say you just game so... pick a test, I like aida64 for my uses, and run a stress test for a few/several hours. If it passes, chances are you will be fine to simply game.

PS- love the passive aggressive lol emoji trolling in the first post...

xtreemchaos · Feb 20, 2020

stick a small fan on it, my vrm is pants with fan it stops in the 70s on high load.
mines holded on with double sided tape.

FreedomEclipse · Feb 20, 2020

Look for something like an Antec Spotcool

mrthanhnguyen · Feb 25, 2020

I put a 120mm fan which run max speed and blow to those vrm area. Temp never has a chance to crack 65c. The problem is I think my pc is freaking loud.

eidairaman1 · Feb 25, 2020

mrthanhnguyen said:
I put a 120mm fan which run max speed and blow to those vrm area. Temp never has a chance to crack 65c. The problem is I think my pc is freaking loud.

Get water cooling or a potentiometer

mrthanhnguyen · Feb 25, 2020

There is no monoblock option for my mobo.

eidairaman1 · Feb 25, 2020

mrthanhnguyen said:
There is no monoblock option for my mobo.

vrm water blocks - Google Search

Mosfet Blocks

EKWaterBlocks Shop offers you complete assortiment for water-cooling of your PC. Only EK and EK confirmed quality products.

www.ekwb.com

mrthanhnguyen · Feb 25, 2020

Which one fit my asus z390 prime a?

tabascosauz · Feb 25, 2020

eidairaman1 said:
vrm water blocks - Google Search

Mosfet Blocks

EKWaterBlocks Shop offers you complete assortiment for water-cooling of your PC. Only EK and EK confirmed quality products.

www.ekwb.com

We all appreciate your work, but you can't just throw lmgtfy at other people without yourself understanding an ounce of what you're actually suggesting. Those aren't monoblocks, and neither do any of those board-specific MOSFET blocks work on his board.

@mrthanhnguyen It's a 9900K @ 5.2GHz and your VRM isn't the greatest around (neither is it the worst). The only way to get around it is to have airflow over the heatsink, which you are already doing. Try and find a quieter fan, rearrange the airflow to work without the extra fan, or use fan control...you can't have everything at the same time.

eidairaman1 · Feb 25, 2020

Ask EK, sometimes we have to adapt and overcome challenges that is why ASepoxy mixed with as5 is a solution...

Taraquin · Feb 25, 2020

mrthanhnguyen said:
My z390 prime a vrm hits 90c during stress test while my cpu stays 70c-75c. Does it cause my oc unstable? I don't see any option to water cool it. Do put a vrm fan help or just buy a new mobo?

VRMs will be much cooler with a 5GHz clock vs 5.2GHz, you can lower voltage and consumption/heat will drop a lot. Performancewise there is very little difference in games. If you use a 240Hz monitor and game at medium settings fullHD with a mid range or better GPU then you might lose a few frames, but in most scenarios it won't make a diffetence.

Vayra86 · Feb 25, 2020

mrthanhnguyen said:
I passed 8hr of realbench, 1hr occt large with avx , but fail occt linpack 2019 within 10m. Im so lazy to buy a new board coz I need to drain the whole loop then install 2tb games.

Drop 100mhz and forget about it.

The board won't give you much more, so back down so you get assurance of a stable setup, and start gaming.

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High VRM temp makes OC unstable

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