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5000 Series Undervolting

The Asgard

The Asgard

The Asgard

Soldato
Joined
27 Jan 2003
Posts
5,962
Location
Chesterfield, UK
I have had my 5900X for a couple of weeks now. I am a big fan of undervolting but my previous experience was just with Intel. So I have been playing with my chip and have been very surprised on how much I can push it.

I am currently running with a CO on all cores of -30. PBO disabled. Stable no problems. So tweaked the LLC to Mode 5 to bring the voltage overshoot down. Again stable. I then tried some negative offset -0.1 with a 50 Mhz boost to get a 5 Ghz boost. Again stable. I then removed the boost and tried for a bigger offset so I am now -0.1125. Machines been up all day building with Visual Studio with some Satisfactory at lunch, again stable. Amazing, no crashes, no WHEA errors.

I do have a custom loop but the rad fans are off. Idle temps of 34'c, Cinebench R23 multi core test in the 50-60, fans are quiet.

Here is a link to my Hwinfo for today https://photos.app.goo.gl/zRinUcrp9bnnrdFL8

How are you guys finding these chips?
 
cliffy said:
Would be interested to see you Cinebench scores if possible please?
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I have not tweaked the memory and it’s got lots installed because it’s a development machine. Like SQL ... So not tuned to break records. I did run it last night with HWinfo up to monitor the multi core boost which was 4650 and single 5Ghz.

The score on R23 multi was 22,872 and Single 1580. Nothing special
 
I’m not sure if you can view the screen shot but I’m amazed with the crazy low minimum voltage, 0.087 volts, surprised it doesn’t crash.
 
pc-guy said:
i didnt think 5900x default boost is 5Ghz+. tis spec boost is 4.8GHz but i think it can boost to 4.9GHz out of box. if you have switched off PBO i dont know how it is managing 5GHz.

using LLC and Curve optimiser really doesnt make any sense, as one counter the effects of the other. in your case you are aggressively allowing the Vcore to droop even further.

Have you tested your individual cores and threads throughly with light single thread workload such as Prime95 Large with no AVX or Aida64 system memory test with affinity set to single thread at a time?

my 5800X managed to boot and under load with CO -30 on all cores but i only found the WHEA errors by using Prime95 Large FFT with no AVX and set affinity to individual cores and let it run for like 20min at a time then will the WHEA error show up.
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Last night was with a 50 Mhz boost. Out of the box with the setting above boost's to 4950, light load. You can see from the Hwinfo.

Testing wise. Its used for development with a light and medium loads all day. At night I'm gaming. Just had a couple of hours in Satisfactory with temps of 48'c and boosts to 4950. I removed the 50 Mhz boost when I dropped the voltage to -0.1125. So testing is actually using it. No WHEA errors over different loads.

Currently running Prime 95 with Large FFT, All core boost 4550.2. 1.087 load with a temp of 56'c, No WHEA Errors, 15 minutes in going to let out the dogs and will report back. Crazy chip!
 
This thing sips power. I have a 1080ti, Aquaero, 3x 140mm, 1x 120, 2x NVME, 2x SSD, 2x Mecahnical, D5 Pump. The 3 fans on the rad never come on. Sits on the desktop drawing while idle 76 Watts according to my HX1000i. Power draw running Prime looking at the image is 172 watts

This setup uses less than my 8700K. Pretty amazing.
 
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Its been a while since I used an AMD chip. The last one was a dual core Athlon 64. So far I have been extremely pleased with this setup. Very impressed with Tomahawk, build quality is up there with the Asus Hero's. The fan never comes on. No USB issues. Totally solid. Love the BIOS. Best upgrade I have had in a long time. AMD are onto a winner for sure.
 
Dropped the override down to -0.1250. I have done a full R23 run multi and single. Previous was with a 50 Mhz boost. 21682, 1561, Multi Core boost 4,650

Prime 95 Large, 23 minute run lowest load voltage was 1.050 volts. 168 watt total power draw, down from 172 Watts

No WHEA errors. Just going to leave it on the desktop.
 
I have bought most of the Intel chips over the years, stopped at the 8700K. The X2 was the last AMD chip. Had a K7, Tbird , Barton before.

The new AMD chips feel like the upgrade from a mechanical to SSD.
 
Yes 1561 is a single core score. Basically I just have C0, PBO Disabled, LLC and a negative offset. Default single core boost is 4950.2, The chips doing its thing given how cool its running along with my custom loop. I'm assuming
 
That’s where using it for software development comes in, a few games, Teams , testing. Lots of light loads. No errors

I have been undervolting CPU’s for a long time.
 
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BHS1975 said:
I got my 5600x running with a -30 on CO and a -0.05 offset with LLC at level 1 with no errors. It maxes out at 65C die temp and 1.13v SV12 TFN with prime 95 max stress and sits at 4650mhz under load. I finally got a decent chip after years of mediocre ones.
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Nice, are you going to push the offset more? I’m using LLC to dampen the voltage over shoot. Which brings down the peak voltage when the load changes.

With a good chip it’s looking like you can possibly run at 1V under load which is pretty amazing. Trying to get a feel of the chip.

My previous 8700K is a sweet chip too. So the undervolting gods have been kind
 
Just having a play. Reduced the offset to -0.1625 and applied a 200 MHz boost. Currently running R23 single thread and it’s boosting up to 5,100.

played with enabling PBO and that’s worth about another 1500 points on R23 multi but adds about 13’c extra heat and 50 watts extra power.

There seems to be lots of combinations for getting a sweet spot.
 
Loxa said:
Is there anyway to undervolt this on stock clocks to actually bring the temps down, i am playing roblox with my kid at 82c :/. Don't get me wrong i am only using 50% fan speed atm which is audible already so i could crank them up and get it cooler but the noise is just to much. I have read pages and pages of pbo/pbo2-curve optimizer and nothing really explains just a plain old decrease in core volts.
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That’s currently what I am doing. If you disable PBO and play with the curve optimiser, suggest negative -5 all cores to start with. You should see a significant reduction in temperature. If your stable you can push it to -30, suggest doing it slowly, depends on chip. If things start to get flaky you can tweak individual cores. Give it a try.
 
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