5000 Series Undervolting

[The Asgard]

Yeah what's weird is that it will run the stress tests just fine down to -0.075 offset and won't boot at -0.1 offset.

That's definitely on the edge. I would have probably back off to -0.050. LLC could help with stability. Curve Optimiser will give you the biggest gain. The offset is just icing on the cake.

 

[The Asgard]

Ahh yeah that's what i thought, havin a tinker with it.

Say i make it to -15 all cores and it crashes how would i know what core is causing it?

You would go to single core and back off each core individually. Depending if its a light application crash, Prime95 should show you which thread is falling over. Usually the Gold and Silver cores should be fine ( Ryzen Master will tell you this ) so you can discount those. It all depends how much time you want to play with it. If you not that bothered, just back the all core value.

Testing is key. Cinebench R23 and 20 Minute Prime 95 with large FFT. Hwinfo to monitor the cores and WHEA errors. Oh and a little book to make notes

 

[The Asgard]

So I have settled on PBO Limits disabled, CO all core -30, negative offset -0.1625, LLC Level 5, plus a 150 Boost. This translates up to 4,750 multi core boost and Single core boost 5.1. R23 multi load 1.119 volts. Tweaks seem marginal now and I don’t want to risk an unstable system. It seems a very forgiving chip.

No crashes, no WHEA errors.

 

[The Asgard]

I am guessing manual OC best way to get say all cores 4.2-4.5 with 1.25v as an example, this curve optimizer is not really what i am after. Quick change to 10 etc and still cracking at 89c in Scavengers games. It's not the fact i am worried about the temps it is the fan noise is unbearable.

I am just looking for a way to get the voltage as low as possible with stock performance.

The curve optimiser should do what your after while boosting due to the extra headroom. However if your struggling with heat and don’t mind dropping the frequency down. If you setup Eco mode it will adjust to what you set. 45 watt, 90 watt. Try these settings and it should adjust to the power settings

 

[The Asgard]

LLC on the MSI pumps less volts the higher the level. I wanted the maximum transient voltage to come down. My peak voltage is 1.3 ish down from 1.5. It gives me stability which is why I use it. Each chip is different. LLC is really important when undervolting.

My simple understanding of CO is that it’s just per core VID lookup table against frequency. AMD limited the setting to 30 so I’m using the offset to push it further.

All the settings are tools to play with. There are no rights or wrongs if it gives you the desired results.

PBO Limits adds an extra 12’c to my load temps for very little gain in performance. Yes I can tweak them but I find this method easier and it works for my chip.

Hwinfo, load tools, a notepad and time gives me the most efficient processor possible. That’s my goal. My system is quiet, consumes less power, stable and fast. Seriously!

 

[The Asgard]

I have used OCCT in past but my general test is Prime, Linpack and Cinebench for getting an indication of load stability. Then general use which consists of Teams, office Apps, Development and Gaming. If I have any issues I back it off or tweak. The machine is used daily for work and so far it’s solid.

 

[The Asgard]

So I after a week of testing using the machine about 14 hours of day. Multi loads, lots of idle, games , compiling I have finalised these settings. I did back off the offset due to a single random reboot while idle. Really pleased.
PBO limits disabled
C0 -30 All Core
Offset -0.1375
LLC Level 5
Boost 200
Running 4 stick of 8gb ram at 3333 @ 15,17,17,36 1.32 volts.

So depending on the what's happening it will multi core boost up to 4750. R23 sits around 4,700, Single core boost 5,150.

https://photos.app.goo.gl/EF3adFJbogsg5LCV8

https://photos.app.goo.gl/SEx3bMKjAu6KJSbx9

 

[The Asgard]

The max clocks are upto for a few cores 5150 and all core can very upto 4700,4750, I think I saw that. With disabling the PBO limits I think the chip is working within certain conditions, probably a lower TDP. With high sustained load the performance will be down with limits disabled. I'm loosing about 1-1.5K from R23 compared with enabling limits. Enabled limits the power goes up, temps go up ( 12'C+ ) which is not what I want. With normal mix load usage I should see good gains for a given watt.

Its interesting trying to make the chip work on the edge of its operating window, its handling some really low voltages.

With a +50 boost and a -0.1125 offset before I installed all my development components I was seeing 22,872 in R23. I am now running a 200 boost.

Trying to tweak the memory but its nothing special, Hynix. Running 3200 , 14,17,17,17 @ 1.35. Its Corsair RGB 3000 goodness, love the lights! Got some 8-Pack B-Die but its only 16 GB.

 

[The Asgard]

Whats is a safe MAX voltage on the 5950x for a manual all core overclock (24/7)? 1.3v or

Single core boost can go up to 1.5 I believe. Before I tweaked my CPU I saw max voltage of about 1.45 ish, depends what the chip is doing really. CO and negative offsets will bring this down.

 

[The Asgard]

The highest voltages you see with Hwinfo are just transient. Sustained core voltages are really low. If you look at my all core Prime95 sustained voltages it’s just 1 volt. General operation is less than a voltage on average. These chips can seriously pull some load hence keeping the voltage down.

 

[The Asgard]

When I set my 5950x to stock, voltage at single core max load = 1.45v, voltage at multi core max load roughly 1v +-0.05v

So that's the stock behavior. If I enable PBO, single core voltage is exactly the same, multi core max load voltage jumps up to 1.29v

So as far as I'm concerned 1.29v is safe for overclocking because when I give the CPU free reign to boost as high as it wants to it will go up to 1.29v

Highest I've tested for all core manual overclocking is 1.25v, I reached 4.6ghz all core with that

I would agree with that.

I look at my loop delta. I’m am trying to keep it low while keeping the performance high. Makes it an efficient and silent system.

 

[The Asgard]

Scores look ok. I was running Prime Large FFT at 1.0v but was also running an offset. See previous attachments.

LLC should help with stability at idle. Have a play and monitor your voltage with Hwinfo

 

[The Asgard]

Hi there,
Your average voltage does seem high. My current readings after 4.5 hrs are

( Gold )
Volts
Min 0.0063
Max 1.356
Average 1.056

Clock
Min 2880.1
Max 5150
Average 3957

I have everything on default and have just overridden the settings detailed in this post. Its a X570 on the Beta V1.63 BIOS (7C84v163)

 

[The Asgard]

Ignore above post. Thanks Asgard, but I'm happy just with co after playing with above, -30 on two best, -25 on next two best and -20 all others seems really stable and prime isn't going to be something I put the CPU through realistically anyways.

That's a good reduction from stock and will allow the chip to stretch its legs. Have you tried a boost override?

 

[The Asgard]

Should be there under Settings / AMD Overclocking

 

[The Asgard]

Disable PBO limits. This defaults power settings based on chip defaults. You should loose 10 ‘c which translates into loosing about 1K from R23 in my testing.

 

[The Asgard]

Correct. It won’t reduce idle at all but on my system it reduces load temps by around 10’c. Which makes it significantly quieter when gaming or using heavy apps. Idle temps are irrelevant if there less than 40’c. The weather brought mine up to around 38’c which is fine.

Just to add my average idle power at the socket for the system is around 80 watts. Which is pretty impressive given the GPU, fans, pump, lights 5 SSD’s, 2 HD and OCTO.

 

[The Asgard]

Ultimately with PBO limits disabled your running the power limits set in the chip which is lower. You do loose a little performance but you are sort of throttling the chip potential to get lower temps. R23 loose about 1K with a score of 22K It’s a good compromise. The chip is really clever in the way it try’s to get the maximum out from a given power envelope, very clever!

 

[The Asgard]

I have been struggling with this like made.

My 5900X had my 2 best cores running on -20, everything else on -15.
200Mhz boost,
and Limits - motherboard.

I am almost at my wits end on getting this stable at low loads.
I also don't know enough about getting everything else set right as i'm not even sure what it is!

MSI x570 Tomohawk, Anyone have any advice

I have tried removing the boost but as soon as I use CO, I get the WHEA error almost without failure on low loads.

All chips are different and it’s about finding the cpu sweet spot. Have you tried disabling PBO limits and using CO settings?

 

[The Asgard]

Still running my 5800x same settings since January, stock was way too hot.
Current settings, 4.6ghz locked all core at 1.25v. Very cool quiet and simple, PBO and other stuff turned off. Curve optimizer too much effort for me

Trying a CO with an all core offset of -5 is pretty simple. Just nudge the setting every few days if it’s stable. I don’t think it can get any simpler.