Question underclocking a 5800x3d

[maddogmcgee]

I'm back again with another computer related problem

I have instability on my gaming PC after an upgrade. Random blue screens with memory related codes. Chrome instability etc.

5800x3d, b450 mortar titanium, currently 1 16gb kit of 3200 ram at xmp settings and 1.35v

I tried
Bios defaults with cmos clear
Moving to 2 sticks of ram from 4
Moving to 1 stick of ram
ram voltage 1.6,1.7
GPU reinstall with drivers and stock settings
GPU with quite mode
new motherboard (that was laying around)
windows refresh
turning off the cpu boost

The last one worked. Now that my sexy new and beautiful 5800x3d is stuck at an unchanging 3.4GHz, like it's 2010, it has been problem free for a week.

If it was a normal cpu I could increase voltage or maybe just play around with an all core clock. None of that is available on this one. Does anyone have a suggestion for any changes to the voltages I do have access to or a way to reduce the maximum boost speed of the chip?

I guess I could also try and return the cpu but I assume its more of an issue with using an older board rather than a cpu defect?

 

[In2Photos]

I assume you have the latest BIOS version?

 

[Thunder 57]

I guess I could also try and return the cpu but I assume its more of an issue with using an older board rather than a cpu defect?

Bunk. I have a B450 board with a 5700X and it has no problems. I can even optimize with PBO/CO. I agree with the above, make sure you have an up to date BIOS. If that doesn't work, I would RMA it. Besides, you said you tried it in another motherboard? Why would that lead you to believe it is NOT the CPU?

 

[solidsnake1298]

I'm also betting on this being a BIOS related issue. I'm wondering if it is trying to boost like it was a non-3D 5800x.

 

[Leeea]

RMA it.

 

[maddogmcgee]

Yeah updated bios for both boards. Sigh, you guys are probably right. I'm just stubborn. Advice appreciated

 

[In2Photos]

Yeah updated bios for both boards. Sigh, you guys are probably right. I'm just stubborn. Advice appreciated

My only other suggestion would be the PSU then. It's possible that you're pulling more power with this CPU and the PSU can't keep up?

 

[Mopetar]

5800X3D pulls less power than most other stuff in actual testing due to the lower clocks/voltage levels.

I'm assuming that a BIOS update will fix it. B450 came out before regular Zen 3, but does generally have support for it with updates.

Reviewers were able to get Zen 3D running on some even older boards, so unless you bought one that the manufacturer abandoned, you should be able to get it working.

 

[Rigg]

What is your soc voltage? Too high or too low can cause instability. 3200 MT/s should be trivial to run stable.

 

[cellarnoise]

Run a few memory tests?

 

[maddogmcgee]

My only other suggestion would be the PSU then. It's possible that you're pulling more power with this CPU and the PSU can't keep up?

It happens during low load/desktop usage. If it was only during high usage I could just limit the tdp of the cpu. That wont help with single core boost though.

 

[maddogmcgee]

What is your soc voltage? Too high or too low can cause instability. 3200 MT/s should be trivial to run stable.

I have tried default and the current settings. I also tried upping the VRAM DREF . No idea what the VDDP/G even is so have left it alone. I have been very hesitant to play with too many of the voltages since its a 3d chip.

 

[maddogmcgee]

I assume you have the latest BIOS version?

View attachment 75877

yep. Although I better double check I cleared the CMOS after.

 

[Thunder 57]

It happens during low load/desktop usage. If it was only during high usage I could just limit the tdp of the cpu. That wont help with single core boost though.

That to me sounds like a problem with LLC. I've never had to mess with it but maybe someone here could suggest something? Might also help if you could show us what LLC options are available in the BIOS.

 

[maddogmcgee]

Didn't think about LLC . I remember messing with that on my 2500k overclock. That's a few years ago now

It does sound like a decent thing to try though since it only seems to have issues at high clocks. Desktop use, games which use a couple of threads etc. CPU stress tests, mem test etc were fine. I wish I was able to take 100MHz away and see how it went.

 

[kschendel]

Have you tried underclocking the memory a little bit, with CPU boost re-enabled? Have you tried turning off PBO but leaving ordinary boost?

That's all mostly academic, since it seems to all come down to your CPU being weak, and RMA is probably the right answer.

 

[maddogmcgee]

Have you tried underclocking the memory a little bit, with CPU boost re-enabled? Have you tried turning off PBO but leaving ordinary boost?

That's all mostly academic, since it seems to all come down to your CPU being weak, and RMA is probably the right answer.

I think maybe I have got it. I upped the SOC/northbridge to 1.1, vddp and vddg to 1.0 and the other one that i forget to just under 1.1 . Passes some short OCCT memory tests as well as stable on desktop. Crosses fingers.

I have never actually returned a computer part in my life. It seems like a pain having to send it and then wait for a new one to arrive. I'm sure it actually would have been sensible to return it rather than spend hours trying to mess with esoteric voltages...but here we are

 

[ZGR]

In the 5800X3D owners thread on Overclock.net, someone else also couldn’t get their 5800X3D to boost. It was an older BIOS that was the culprit.

Post a screenshot of ZenTimings (latest version is 1.2.9) to see your voltages. Some motherboards won’t display some voltages in this app though.

Here is my 5800X3D for reference. I am using cheap RAM. Overclock.net also has some great tutorials for overclocking cheap DDR4 on AM4. Made it a breeze to set up.

 

[maddogmcgee]

In the 5800X3D owners thread on Overclock.net, someone else also couldn’t get their 5800X3D to boost. It was an older BIOS that was the culprit.

Post a screenshot of ZenTimings (latest version is 1.2.9) to see your voltages. Some motherboards won’t display some voltages in this app though.

Here is my 5800X3D for reference. I am using cheap RAM. Overclock.net also has some great tutorials for overclocking cheap DDR4 on AM4. Made it a breeze to set up.

View attachment 75973

XMP loaded and everything left on auto apart from voltages.
NO idea what any of these settings do but tRDWR is 7 on one stick and 8 on the other. Is that normal? OCCT memory test failed this morning.

 

[ZGR]

Your timings should be the same across all sticks. You could manually set them up. I have all my timings manually inputted in BIOS. I'd check out this quick guide to get started:

A guide to ram overclocking on Zen 3

www.overclock.net

Using Thaiphoon Burner will tell you what kind of RAM you have. In my case, it is Hynix CJR. Googling your RAM says CJR as well. Assuming it is CJR (might not be)...



Changing all of this in one go might not work since something might not be stable. I can't lower my tWRRD, tWR and tRTP for example.

But these are 'safe' numbers. You can probably go lower for tRRDL and tFAW. I am unsure how low you can go for tRFC, tRFC2, and tRFC4. Lower in intervals of 8 since you are 8GB per stick. I'd do those 3 last.

I'd increase your DRAM voltage to 1.4 to 1.45 V for now. Since you are at 16GB and using SR sticks, you can probably get some serious gains here. If you are still getting memory errors, I'd take a stick out and test again. 3200-3400 MHz could be your max also.

But your VSOC, VDDG CCD, and VDDG IOD voltages can definitely be a bit lower. Once you get all that dialed in, use PBO2 Tuner to dial in your undervolt and/or power limits in Windows. Using Curve Optimizer in BIOS is also a common feature in later BIOS updates.

How-to-undervolt-AMD-RYZEN-5800X3D-Guide-with-PBO2-Tuner/README.md at main · PrimeO7/How-to-undervolt-AMD-RYZEN-5800X3D-Guide-with-PBO2-Tuner

Get the Most out of your 5800X3D using PBO Curve Optimizer! - PrimeO7/How-to-undervolt-AMD-RYZEN-5800X3D-Guide-with-PBO2-Tuner

github.com

I have been doing -30 steps per core and just 45W PPT /40A TDC/ 45A EDC for awhile.

 

[maddogmcgee]

Your timings should be the same across all sticks. You could manually set them up. I have all my timings manually inputted in BIOS. I'd check out this quick guide to get started:

A guide to ram overclocking on Zen 3

www.overclock.net

Using Thaiphoon Burner will tell you what kind of RAM you have. In my case, it is Hynix CJR. Googling your RAM says CJR as well. Assuming it is CJR (might not be)...

View attachment 75989

Changing all of this in one go might not work since something might not be stable. I can't lower my tWRRD, tWR and tRTP for example.

But these are 'safe' numbers. You can probably go lower for tRRDL and tFAW. I am unsure how low you can go for tRFC, tRFC2, and tRFC4. Lower in intervals of 8 since you are 8GB per stick. I'd do those 3 last.

I'd increase your DRAM voltage to 1.4 to 1.45 V for now. Since you are at 16GB and using SR sticks, you can probably get some serious gains here. If you are still getting memory errors, I'd take a stick out and test again. 3200-3400 MHz could be your max also.

But your VSOC, VDDG CCD, and VDDG IOD voltages can definitely be a bit lower. Once you get all that dialed in, use PBO2 Tuner to dial in your undervolt and/or power limits in Windows. Using Curve Optimizer in BIOS is also a common feature in later BIOS updates.

How-to-undervolt-AMD-RYZEN-5800X3D-Guide-with-PBO2-Tuner/README.md at main · PrimeO7/How-to-undervolt-AMD-RYZEN-5800X3D-Guide-with-PBO2-Tuner

Get the Most out of your 5800X3D using PBO Curve Optimizer! - PrimeO7/How-to-undervolt-AMD-RYZEN-5800X3D-Guide-with-PBO2-Tuner

github.com

I have been doing -30 steps per core and just 45W PPT /40A TDC/ 45A EDC for awhile.

Appreciate you taking the time to post this.

On the previous mobo it was crashing with 1 stick at 2133MHz. I have 4 sticks 8gb sitting here and tried a few in different combinations.
On this mobo I have tried with 2 sticks at default speed and timings (2133MHz) and it still crashed. This, combined with the stability when the CPU boost is turned off, is what led me to assume it's a CPU issue

I am skeptical about tightening the timings at the moment, wont they just make it harder to get everything stable rather than easier?

 

[ZGR]

I’d update your BIOS before doing anything else first.

If you enable XMP but then lower your clocks to 2133 do you still crash? If tRDWR is still not matching, I would fix that in BIOS and then test again.

Defective CPU rare but it does happen. I’d return it asap and try another one.

 

[cellarnoise]

I think this is a RAM issue rather than a cpu issue. I would back down ram speed and timings to a lower motherboard default, lower than xmp settings anyway.

Normally the MB has non-xmp ram settings options also at various speeds. I'd try some of these with only 2 sticks (though one of your 4 may have a problem?) and compare timings and see if they are less than then xmp settings. For Zen3 you normally don't have to play around with SOC and other RAM voltages besides base ram voltage and then not over 1.45V unless you are pushing above the xmp rated speeds. Normally RAM does not even need over whatever base xmp voltage is and hopefully not over 1.4V for 3200 to 3600.

One of your Ram sticks might have a problem? 4 sticks is harder to run than 2 at higher frequency anyway.

 

[Shmee]

Sounds like it is a memory issue, and according to the Zen timings screenshot, it looks like the motherboard has the latest UEFI version. Are these all Corsair DIMMs? Looks like they might be, according to the screenshots. I would run Memtest86 as well, if you haven't already, and if you get any errors, I would probably contact Corsair support for a possible RMA.

 

[maddogmcgee]

I'm only running 2 sticks of ram atm, they are 2 seperate kits of 16gb which can cause issues itself. I have been hesitant to up the voltage too much but I will give the 1.4-1.45 ram voltage with manual timings a go. If that doesnt work I will start from scratch with 1 stick at a time at 1.4v 2133MHz. I actually have a brand new 2x4gb kit I can try as well. I did double check the manual to make sure I wasn't doing something stupid with the what ram slots were being used. I guess I also need to make sure I am running each ram test for longer.