Ryzen 2000 downclocks under Prime95 ???

Methanoid · 26 Aug 2019 at 16:35

I just dialled in 4.0 GHz and 1.35v to get a quick and dirty OC. I disabled PBO and any Turbo features. Its an R7 2700 (so max 4.1 single core anyway)

Load up HWInfo and it shows all cores idle at 4.1 ?? and when I test stressing with Prime I notice the speed drops to 1.7 GHz. Temps are 51C max.

Something clearly not right... With Intel systems Prime forces the cores to run at max and ramps up temps so you can see if its stable. 51C is not high so why are the cores INSTANTLY downclocking on this Ryzen.

I'm sure its obvious to someone who knows how to OC Ryzen but its puzzling me....

mmj_uk · 26 Aug 2019 at 18:51

I suspect it's some kind of power limiter to protect the motherboard VRM's there may be a setting hidden somewhere in the BIOS unless it's a cheap motherboard.

If you want a CPU that is designed to run without limits you're probably better off with server hardware these days, consumer CPU/GPU's started going the "we'll artificially limit the amount of load it can sustain for higher clocks" route a long time ago.

MaXxBoulton · 26 Aug 2019 at 19:17

What cooler are you running, and on what motherboard

Methanoid · 26 Aug 2019 at 19:19

Freezer 33 (max temp 51c) and MSI x470 Gaming Plus.

Danny75 · 26 Aug 2019 at 19:47

I'd say current limit, power limit (as mentioned) or one of the turbo features might need enabling. Reset Bios to default and see.

Methanoid · 26 Aug 2019 at 22:05

Danny75 said:
I'd say current limit, power limit (as mentioned) or one of the turbo features might need enabling. Reset Bios to default and see.

Did that, zero change. There is a TDP control option in BIOS but the max you can set it to is 65W (default), or Auto which presumably is same as 65W. I would bet that is where the issue is.

gerardfraser · 26 Aug 2019 at 22:58

Methanoid said:
Freezer 33 (max temp 51c) and MSI x470 Gaming Plus.

Here is a video I did How to overclock 2600X.
I suppliied screen shots of every setting in the BIOS links to google Drive.Try it out.
4250Mhz@ 1.35v

♦ CPU - AMD 2600X 4250 Mhz With MasterLiquid Lite ML240L RGB AIO
♦ Mobo - MSI X470 - Gaming Plus (BIOS 7B79vA9 AMD AGESA Combo-AM4 0.0.7.2 BIOS)

Just to let you know when speeds drop in Prime like that then one of the cores failed test,That is normal.

MaXxBoulton · 27 Aug 2019 at 06:58

Tou could be under volting the cpu.

Try adding 0.100 so 1.450, when the ryzen cpus and under volted they dont crash instead the clocks drop under very heavy load.

All the tests your running will run the cpu at full speed but only prime will really push the cpu to its limits.

Methanoid · 27 Aug 2019 at 10:33

MaXxBoulton said:
Tou could be under volting the cpu.

Try adding 0.100 so 1.450, when the ryzen cpus and under volted they dont crash instead the clocks drop under very heavy load.

All the tests your running will run the cpu at full speed but only prime will really push the cpu to its limits.

I solved the issue.. Basically MSI's BIOS is broken. I downgraded to the pre-Ryzen3000 BIOS and it worked fine as it should. No downclock, no problems with 4.1GHz OC.

MSI squeezed Ryzen 3000 support in by removing the pretty ClickBIOS graphics and older Hammer processors from the BIOS and just managed to fit it in. I suspect the broke OC when they did that and failed to test the BIOS properly.

Methanoid · 27 Aug 2019 at 10:45

gerardfraser said:
Here is a video I did How to overclock 2600X.
I suppliied screen shots of every setting in the BIOS links to google Drive.Try it out.
4250Mhz@ 1.35v

♦ CPU - AMD 2600X 4250 Mhz With MasterLiquid Lite ML240L RGB AIO
♦ Mobo - MSI X470 - Gaming Plus (BIOS 7B79vA9 AMD AGESA Combo-AM4 0.0.7.2 BIOS)

Just to let you know when speeds drop in Prime like that then one of the cores failed test,That is normal.

Hi, video very useful. TBH it didnt teach me anything I didnt know as the settings were same once I downgraded BIOS but I did watch a few of your other vids too. My 2700 isn't a "great" overclocker but I am happy with all cores at 4.1 for now.

Methanoid · 27 Aug 2019 at 16:02

gerardfraser said:
Here is a video I did How to overclock 2600X.
I suppliied screen shots of every setting in the BIOS links to google Drive.Try it out.
4250Mhz@ 1.35v

♦ CPU - AMD 2600X 4250 Mhz With MasterLiquid Lite ML240L RGB AIO
♦ Mobo - MSI X470 - Gaming Plus (BIOS 7B79vA9 AMD AGESA Combo-AM4 0.0.7.2 BIOS)

Just to let you know when speeds drop in Prime like that then one of the cores failed test,That is normal.

Also as well as finding the latest BIOS broken, I find on the one you and I are both on (now) if you enable XMP for the Ram and then change the timings the BIOS loses the ability to overclock the CPU. I seriously think MSI have not got a clue how to produce a BIOS. I verified this 3 times. I'd like to be running my 3200MHz ram at tighter timings (Ryzen Dram Calculator) but if I try to... no CPU overclock. Crazy!

gerardfraser · 27 Aug 2019 at 16:49

Well I can start by saying I made the video for someone who did not know where to start or what to do.I was trying to help you.Do not take this the wrong way.

I also disagree with you about the Motherboard.It is a fantastic motherboard for so cheap.Has High end features and is a great overclocker on my 2600X/3600X and I have tried over 15+BIOS and I am good with them.For some reason they seem to work .It is too bad, you had a different experience than me.Maybe I am just lucky.What do you think.

Example:Ryzen 2600X 4400Mhz Default BIOS Voltage and RAM+ DDR4 running all the way pass max ram speed supported.CL14 3200Mhz/3466Mhz/360Mhz and CL163200Mhz/3466Mhz/3600Mhz

Ryzen 3600X Tested Tight Ram Timings 2133/2400/2933/3200/3733/4000/4200Mhz Also 3600X boost 4525Mhz gaming and Cinebench

Methanoid · 27 Aug 2019 at 20:49

gerardfraser said:
Well I can start by saying I made the video for someone who did not know where to start or what to do.I was trying to help you.Do not take this the wrong way.

I also disagree with you about the Motherboard.It is a fantastic motherboard for so cheap.Has High end features and is a great overclocker on my 2600X/3600X and I have tried over 15+BIOS and I am good with them.For some reason they seem to work .It is too bad, you had a different experience than me.Maybe I am just lucky.What do you think.

Example:Ryzen 2600X 4400Mhz Default BIOS Voltage and RAM+ DDR4 running all the way pass max ram speed supported.CL14 3200Mhz/3466Mhz/360Mhz and CL163200Mhz/3466Mhz/3600Mhz

Ryzen 3600X Tested Tight Ram Timings 2133/2400/2933/3200/3733/4000/4200Mhz Also 3600X boost 4525Mhz gaming and Cinebench

Dont get me wrong either.. the video was helpful and I didnt mean to come across ungrateful for the link. It confirmed that it was possible to OC with the board. Much better results with same BIOS version as you. But your chip seems a better sample than mine (lower volts etc and higher clocks). Your memory is miles higher rated than mine too (only 3200 here).

Its a good entry level board (and I wanted Realtek LAN and ALC889 for running AROS so it ticked that box). It just has some pecularities I will need to get used to as I indicated. I may try the latest r3000 BIOS again when I feel like another bout of masochism to see if there is some pecularity to getting that to work for OC also.

Methanoid · 27 Aug 2019 at 20:51

@gerardfraser also I am curious what made you make the selections you did for "On Die Termination Configuration".... The other settings look very similar to what Ryzen Dram Calculator would advise but I didn't change those On Die ones on my system

gerardfraser · 27 Aug 2019 at 22:21

I agree the Motherboard is the cheapest X470 out there and can have some problems,I agree 100% with you.Not every feature in every BIOS works as intended but just look at the problems with the high end motherboard for Ryzen.
I was just saying I got lucky with 2600X and actual 2 x 3600X where people say I won the silicone lottery,which I do not believe .I just think the cheap board is good.
I have great performance out of this motherboard,more so then some high end boards and the kicker is I got the board in a bundle deal for around £10-£15 I forget actual price now.

As far as on die termination it is different between 2000/3000 series .I am no ram guy.You can check out the guy who made the Ryzen calculator and I have read this on overclock.net is what he recommends.
3000 series -Should be between 30-40
2000 series -Should be between 40-60

I also ran with 2600X
DDR4 F4-3200C16S-16GVK Intel Ram with overclock to CL14 3400Mhz-CL16 3600Mhz with the Msi X470 gaming plus.

Methanoid · 29 Aug 2019 at 12:20

Which CPU do you have in the mobo now?

Can you put my mind at rest here PLEASE

In the BIOS screenshots you don't use A-XMP and dial in all memory settings manually. Can you confirm when you run Prime95 the CPU does NOT downclock?

EDIT: I have tested several times with identical settings to yours and ANY change to Ram timings means the OC downclocks under Prime. It boots etc fine at any frequency I choose to OC to but will always downclock. I think the BIOS is bugged!

gerardfraser · 30 Aug 2019 at 04:49

I have a 3600X in the Motherboard.Hope it helps some. Sorry i have not recorded any test exactly like you said.

If you do not have a fixed all core overclock then running Prime95 the CPU voltage/CPU clock speed will be reduced.This is how it works.I can not see your motherboard is buggged and mine is not.Anything is possible.

AMD CPU will increase clock speeds when the CPU has electrical, thermal, and/or utilization to spare and decrease when these parameters are not met.

I do not run XMP on any RAM kit I used in the motherboard.I always adjust timings manual ,mainly because the RAM is Intel XMP 2.0.

I will give you a couple videos with 2600X where the fixed all core overclock will not downclock. I do not think I recorded Prime95 with 2600X ever but I may have ,if I did I will upload it.I have to go thru old hard drives.

I recorded Prime95 video and show how to set the 3600X so it will not downclock .Your 2700 should be the same.
I will not use XMP profiles because as I mentioned I have XMP 2.0 Intel Ram,so setting need to be set manual so I do not have problems with AMD CPU.

I will try to ease your mind some.I have the latest BIOS installed with 3600X and MSI X470 Gaming Plus but the setting for the older BIOS will be similar.Just check out blender renders ,Cinebench below.Hope it helps some.
Prime95 Test without downclock.
CPU speed 4000Mhz
CPU voltage .1325v
Precision Boost Overdrive disabled

OK Blender render with BIOS settings at start of video.This setting will not down clock with Prime95 on Ryzen 2600X/2700X
CPU Clock- 4250Mhz
CPU voltage- 1.38v BIOS
Ram Speed- CL14 3400Mhz
I forgot BIOS version on this test

AMD 2600X 4300 Mhz Stability Encode Test with new X470 BIOS Also would not down clock running Prime95.This test was over 3 hours or so without down clock.
CPU Clock- 4300Mhz
CPU voltage- Auto setting in BIOS ,so CPU voltage adjust itself by AMD algorithm
Ram Speed- CL14 3466Mhz
BIOS 7B79vA9 AMD AGESA Combo-AM4 0.0.7.2 BIOS

Ryzen 2600X 4350Mhz run with Cinbench ,AIDA64 Memory test 3466Mhz
CPU Clock- 4350Mhz
CPU voltage- Auto setting in BIOS ,so CPU voltage adjust itself by AMD algorithm
Ram Speed- CL14 3466Mhz
BIOS 7B79vA9 AMD AGESA Combo-AM4 0.0.7.2 BIOS

Methanoid · 30 Aug 2019 at 09:54

tHANKS... definitely some strange problem I am having then.... I better hope MSI support prove better than they have done so far

gerardfraser · 30 Aug 2019 at 16:35

Just to be clear running Prime95 will down clock on all Motherboards if BIOS settings are not fixed and CPU actually ignore BIOS settings if BIOS settings are incorrect,then it would also down clock running Prime95 also.
Also have you set your RAM properly with different method using XMP profile.IF you want to try.

Download DRAM Calculator for Ryzen with Thaiphoon burner.

In thaiphoon burner export your XMP profile with complete HTML Report and save delays in nanoseconds to desktop or somewhere you would remember.
Then import the XMP complete HTML Report to DRAM Calculator for Ryzen

Then in the DRAM Calculator for Ryzen pick the settings you want and try them(fast will work),they are meant as a guide and if you have a couple of errors give more voltage to Dram.
If games crash/stop/hitch/stutter then your RAM timings are not quite correct and you need to adjust them.This is why the DRAM Calculator for Ryzen is perfect guide for someone/anyone out there.

Methanoid · 30 Aug 2019 at 19:16

gerardfraser said:
Just to be clear running Prime95 will down clock on all Motherboards if BIOS settings are not fixed and CPU actually ignore BIOS settings if BIOS settings are incorrect,then it would also down clock running Prime95 also.
Also have you set your RAM properly with different method using XMP profile.IF you want to try.

Download DRAM Calculator for Ryzen with Thaiphoon burner.

In thaiphoon burner export your XMP profile with complete HTML Report and save delays in nanoseconds to desktop or somewhere you would remember.
Then import the XMP complete HTML Report to DRAM Calculator for Ryzen

Then in the DRAM Calculator for Ryzen pick the settings you want and try them(fast will work),they are meant as a guide and if you have a couple of errors give more voltage to Dram.
If games crash/stop/hitch/stutter then your RAM timings are not quite correct and you need to adjust them.This is why the DRAM Calculator for Ryzen is perfect guide for someone/anyone out there.

thats the kicker... My OC never downclocks (it should not when Prime95 running as it stresses CPU fully) except if I make any change to the ram from the XMP settings.

I have done the Thaiphoon/Ryzen Dram Calc to get settings to try. They pass hours of mem test too. But if I use them then my OC goes wobbly...