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5800X high idle temps

Associate
Joined
28 Oct 2011
Posts
535
Hi all,

My 5800X idles between 50-65c - although at full load (cinebench, aida64 etc) it never really tops 75c. Idle voltages seem to be basically stuck at 1.4v(ish) constantly. Running it at PBO stock (with -5 curve on all cores).

It's under a custom loop with a 360mm rad.

Any ideas?
 
Soldato
Joined
7 Dec 2010
Posts
6,174
Location
Leeds
Hi all,

My 5800X idles between 50-65c - although at full load (cinebench, aida64 etc) it never really tops 75c. Idle voltages seem to be basically stuck at 1.4v(ish) constantly. Running it at PBO stock (with -5 curve on all cores).

It's under a custom loop with a 360mm rad.

Any ideas?

Have you checked for an updated BIOS for your motherboard ?
 
Soldato
Joined
7 Dec 2010
Posts
6,174
Location
Leeds
Yup, I'm on the latest beta bios (the only bios that support 5000 series on msi x470 gaming plus max


You tried just leaving it at default and xmp only enabled as a test ? It could be the BIOS not working right when you play with PBO at the moment.
 
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OP
Joined
28 Oct 2011
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535
Just go in the bios restore defaults and set xmp on and your boot drive if needed. That way rules out any changes you may have made.

Nope - actually runs hotter - not a massive surprise as my settings were running at a slightly decreased voltage than stock - still... 1.4v/55c at idle seems nuts but maybe its the norm for this chip... my 3600 ran about 30c idle
 
Soldato
Joined
3 May 2012
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5,415
My 5800x idles at 28-30 with a NZXT Kraken and 60-65 at load so something is wrong there.

Mine idles about 35c, max 75c same cooler.

I have PBO +150 so 5 GHz boost.

Great cooler though, I have the the RGB colour thingy set to a temperature scale from dark blue to dark red (litmus scale?) so you can look it to see how warm your CPU is.
 
Associate
Joined
22 Jan 2021
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3
My 5800x idles about 41c and hits about 67c under full load.
Sounds like something isn't right but could just be silicon lottery, I heard before I got this CPU that they run hot.
Have you tried reapplying thermal paste? Maybe you got a bad seat
 
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5 Mar 2017
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Cambridge
Load not bad, really, idle is really bad. Either something is forcing the CPU to boost/running processes or bad contact (which I don't believe, as load temperatures would cause thermal throttle.
It's a game of finding what works best for your CPU.

Just for comparison, different Ryzen Gen, but my best voltage for temperatures without affecting much of the boost is with PBO enabled and voltage offset to - 0.2. Using - 0.15 my temperatures during stress test increases about 6C. Using an offset of -0.1, the temperature increases up to 12C compared to the -0.2 offset.
Spend few hours this afternoon and ended up using the offset of -0.1, as unless running stress test the CPU would max at mid 50's to 60C (games or 3D Mark). Even during stress test would max at 72C, which I found acceptable. Reason for opting for -0.1 is because I noticed the single core boost would happen more often and for longer. 300+ on Fire Strike, and as gaming is the more demanding task I use the PC for, the CPU would be at 60C or less.

I would recommend some play with voltage, nothing too aggressive, just to get a feel and try to tame the temperatures a bit.

But the first call is checking your power plan on Windows and make sure the minimum processor state isn't set at 90, 95 or 100%. Mine I have set to 5%.
 
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OP
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28 Oct 2011
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535
So it looks like something is causing my cpu to boost, even at idle. I can't find the culprit, or culpritS. But yep, boost and 1.4v at idle, so I guess 55c is an appropriate temperature for that. Windows power plan is correct.

On a fresh Windows without any apps, it idles at about 30c. Hmm, not sure how to investigate that, task manager doesn't seem to show any obvious culprits!

In regards to a lower voltage offset, unfortunately setting any kind of voltage offset doesn't work with PBO2/curve optimiser. Atleast not in my BIOS, maybe its a bug, but the frequency gets locked at 3.8 with any kind of offset and PBO2.
 
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OP
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28 Oct 2011
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535
Ok so turns out its the Corsair iCUE software not letting my machine idle properly... even though I only use a static colour on my keyboard, if I exit the software the lighting turns off completely. Bloody useless.
 
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20 Aug 2020
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South Wales
Any version before the current iCue version 3.37.140 caused my 5950X to idle about at about 40c, but with the current one my CPU idles at 33c on an H150i Pro. iCue is a pain in the ass for not letting the CPU idle properly, iCue has become far too bloated.
 
Soldato
Joined
3 May 2012
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5,415
Yea it's crazy how these CPUs boost for seemingly nothing.

I was downloading a game in Steam minimised, which was causing similar what appeared to be "idle" temperatures.
 
Associate
Joined
17 Feb 2009
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869
iCue seemed to increase my CPU temps too. With the latest update however it seems fine now. idling around 30c with a 3600
 
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