Vcore voltage too low?

[joser1813]

Hi guys! I would like to know if the CPU Vcore voltage is ok. I think it might be low because sometimes the computer randomly crashes, CPU goes out (CPU EZ debug led turns on) with monitor, keyboard and mouse signal but fans and hdds keep going. I was playing with overclocking to 3,45 GHz to 3,5 GHz and the same thing happens. I suspect my PSU's 8 pin connector isn't supplying enough voltage.

 

 
 

 

 

 

[Jurrunio]

Maybe that;s just too little core voltage for this clock speed. Raise it.

 

It shouldnt have anything to do with the PSU as long as it's within ATX spec (which allows 10% variation for 12V for example, which is what the 8pin carries)

[joser1813]

2 minutes ago, Jurrunio said:

Maybe that;s just too little core voltage for this clock speed. Raise it.

 

It shouldnt have anything to do with the PSU as long as it's within ATX spec (which allows 10% variation for 12V for example, which is what the 8pin carries)

the thing is that those are default settings. I can see Vcore voltage reading around 1,35 V in the BIOS but closer to 1 V on windows

[Hairless Monkey Boy]

2 minutes ago, Jurrunio said:

It shouldnt have anything to do with the PSU

It may, however, have to do with your motherboard's VRM. What motherboard do you have?

[Hairless Monkey Boy]

1 minute ago, joser1813 said:

the thing is that those are default settings. I can see Vcore voltage reading around 1,35 V in the BIOS but closer to 1 V on windows

By default the CPU downclocks according to use. As it does, the Vcore will reduce accordingly.

[joser1813]

6 minutes ago, HairlessMonkeyBoy said:

It may, however, have to do with your motherboard's VRM. What motherboard do you have?

That's not likely. I have bought this motherboard brand new and the same exact thing happened with the old Asrock B450 board. Is less frequent with this one tho. It's the MSI B450 Tomahawk

 

[joser1813]

4 minutes ago, HairlessMonkeyBoy said:

By default the CPU downclocks according to use. As it does, the Vcore will reduce accordingly.

I didn't know that but I've been having this strange problem for a while now and haven't been able to find the cause. I'm planning to buy another PSU and RAM, eventhought RAM passed memtest86 twice but I have no idea what else to do apart from replacing 1 component at a time.

[joser1813]

7 minutes ago, HairlessMonkeyBoy said:

By default the CPU downclocks according to use. As it does, the Vcore will reduce accordingly.

Hi, I've just ran CPU Z stress test and Vcore voltage stays low

[Jurrunio]

16 minutes ago, joser1813 said:

the thing is that those are default settings. I can see Vcore voltage reading around 1,35 V in the BIOS but closer to 1 V on windows

Then it's vdroop, add some LLC to compensate. Need LLC if you dont run auto voltage

[Hairless Monkey Boy]

5 minutes ago, joser1813 said:

Hi, I've just ran CPU Z stress test and Vcore voltage stays low

What frequency is that? The score seems low to me. Looks like you are underclocked.

[joser1813]

8 minutes ago, HairlessMonkeyBoy said:

What frequency is that? The score seems low to me. Looks like you are underclocked.

It's well over 3,2 GHz base clock. It's worth mentioning that I only have 1 stick of ram and that could be hurting the score in this case

 

[Hairless Monkey Boy]

3.2Ghz is low. From what I am seeing the all core boost should be something like 3.4Ghz.

 

https://www.techpowerup.com/review/amd-ryzen-7-2700/16.html

 

3 minutes ago, joser1813 said:

I only have 1 stick of ram and that could be hurting the score in this case

That'll be part of it.

[joser1813]

37 minutes ago, Jurrunio said:

Then it's vdroop, add some LLC to compensate. Need LLC if you dont run auto voltage

Shouldn't that be working fine on default settings?

[Jurrunio]

2 minutes ago, joser1813 said:

Shouldn't that be working fine on default settings?

didnt you say you played with overclocking?

 

Otherwise you could

1. clear CMOS (.e. wipes BIOS settings)

2. update BIOS

3. dont use newest Windows versions (i.e. 2004)

[joser1813]

15 minutes ago, Jurrunio said:

didnt you say you played with overclocking?

 

Otherwise you could

1. clear CMOS (.e. wipes BIOS settings)

2. update BIOS

3. dont use newest Windows versions (i.e. 2004)

Yea but the issue have been present since I got the CPU. I've just started playing with some settings but the OC profile is not active at the moment. I can recreate the crash when I overclock with Ryzen master which has 1 V by default in the profile, that causes the CPU to go out. I think the issue is related to low voltage on default setting. However, I don't know why the voltage is low. BIOS is up to date. Chipset drivers are up to date. The crashes don't happen very often so I can use the PC all day long, except when it crashes every once in a while and that anoys me a lot. 

[Guest]

2 minutes ago, joser1813 said:

Yea but the issue have been present since I got the CPU. I've just started playing with some settings but the OC profile is not active at the moment. I can recreate the crash when I overclock with Ryzen master which has 1 V by default in the profile, that causes the CPU to go out. I think the issue is related to low voltage on default setting. However, I don't know why the voltage is low. BIOS is up to date. Chipset drivers are up to date. The crashes don't happen very often so I can use the PC all day long, except when it crashes every once in a while and that anoys me a lot. 

Find the Cpu LLC setting and take it off of auto. Set it to the maximum setting and test.

 

[joser1813]

42 minutes ago, ShrimpBrime said:

Find the Cpu LLC setting and take it off of auto. Set it to the maximum setting and test.

 

See attached images. I've just manually adjusted the Vcore voltage to 1,25 but it stays closer to 1,05 on default settings. LLC in mode 8 on the BIOS. Looks like my CPU or the drivers aren't working properly. As far as I know, the CPU should be doing fine on default settings. 

I don't understand which voltage they are talking about on this image. What am I missing?

 

 

[Guest]

Your Cpu looks pretty close to where it should be actually. 

The first screen shot with 4ghz the voltage is a lie. Under a load it would be greatly increased to what they had set, around 1.4v respectively for 4000mhz. Which is accurate for that kind of manual overclock.

 

Your Cpu has a base clock of 3.2ghz. The Max single core XFR boost is 4.1ghz. 

So your all core clocks between 3500 and 3600mhz are ok because they are boosted frequencies. 

 

The 2700X model only boosts 3.8-3.9ghz stock. So everything looks ok from my seat.

 

Run the LLC higher to help prevent the Cpu from hanging. If that works, stick with it. V-droop and V-drop are real things. FX-9590 suffered from it very badly as an example from the past.

 

 

[joser1813]

2 minutes ago, ShrimpBrime said:

Your Cpu looks pretty close to where it should be actually. 

The first screen shot with 4ghz the voltage is a lie. Under a load it would be greatly increased to what they had set, around 1.4v respectively for 4000mhz. Which is accurate for that kind of manual overclock.

 

Your Cpu has a base clock of 3.2ghz. The Max single core XFR boost is 4.1ghz. 

So your all core clocks between 3500 and 3600mhz are ok because they are boosted frequencies. 

 

The 2700X model only boosts 3.8-3.9ghz stock. So everything looks ok from my seat.

 

Run the LLC higher to help prevent the Cpu from hanging. If that works, stick with it. V-droop and V-drop are real things. FX-9590 suffered from it very badly as an example from the past.

 

 

I hope this works, I shouldn't need to replace any hardware if it does and that'd be fantastic. I will investigate more on that topic. Thanks a lot

[Guest]

Just now, joser1813 said:

I hope this works, I shouldn't need to replace any hardware if it does and that'd be fantastic. I will investigate more on that topic. Thanks a lot

I hope it works as well. Cause if it does, You'll lower the LLC down one click and test some more.

 

[Jurrunio]

8 minutes ago, ShrimpBrime said:

I hope it works as well. Cause if it does, You'll lower the LLC down one click and test some more.

 

yeah definitely dont go max LLC, that stomps on voltage regulation like me on cockroaches

[Guest]

Just now, Jurrunio said:

yeah definitely dont go max LLC, that stomps on voltage regulation like me on cockroaches

The board on auto is probably set to second highest.... At least my Asus boards are. 

 

It won't hurt anything. It's a stock 65w part. It's hardly loading the VRMs. 

 

Good looking out though!

[joser1813]

33 minutes ago, ShrimpBrime said:

The board on auto is probably set to second highest.... At least my Asus boards are. 

 

It won't hurt anything. It's a stock 65w part. It's hardly loading the VRMs. 

 

Good looking out though!

A quick question. I just watched GamersNexus video on LLC. Vdrop is a safety measure as far as I'm understading. Could Vdrop be causing the random crashes when the system is on completely default settings except for the memory (Auto everything)?

As I said, they happen, maybe once every 20 days in average with the tomahawk board. The crashes were more frequent on the Asrock B450 HDV R4.0. 

Edit: If I go for 3,45 GHz manually with 1 V, I can recreate what happens randomly

[Guest]

3 minutes ago, joser1813 said:

A quick question. I just watched GamersNexus video on LLC. Vdrop is a safety measure as far as I'm understading. Could Vdrop be causing the random crashes when the system is on completely default settings except for the memory (Auto everything)?

As I said, they happen, maybe once every 20 days in average with the tomahawk board. The crashes were more frequent on the Asrock B450 HDV R4.0. 

Well the Load Line Calibration is exactly for the v-droop remedy. Something you can play with. You don't have to use max, you could try a lower setting like lvl 2 maybe and see if the issue occurs more often.... It's flexible like that. 

[joser1813]

On 6/15/2020 at 11:19 PM, ShrimpBrime said:

Well the Load Line Calibration is exactly for the v-droop remedy. Something you can play with. You don't have to use max, you could try a lower setting like lvl 2 maybe and see if the issue occurs more often.... It's flexible like that. 

Hi! I have an update on the situation. The problem has persisted, I think I've identified it as low voltage on the CPU (I don't know the cause yet). Tt might still be Vdroop but it doesn't go away even after playing with LLC. I've just experienced an slow down on my cursor which normally happens when the system is about to crash. This is time it didn't crash and Hwinfo registered a very low cpu voltage around 0,54 V. Reading about LLC on MSI boards, it appears the mode 1 is the highest, instead of mode 8. I'm trying mode 3 this time.