[SOLVED] Ryzen 5 1600AF needs high voltage on O.C.

[xurmirac]

People work it on 3.9GHz with 1.275V average but i have to increase 1.375V if i want 3.9GHz and it is proportional. While they work it 3.75GHz without giving voltage, but i had to. Why? If i don't give enough voltage, monitor shows me "no cable connected", "no signal" , or " no display" messages, USB ports don't work on back panel and ethernet port also does not. Also the GPU fans are working at full capacity and when i reboot, everything is default. Why does it need too high voltage?

 

[drea.drechsler]

... Why does it need too high voltage?

First off is to understand "too high" a voltage is relative as every CPU is different, some with less leakage current that can function with lower voltage and some with more leakage current that needs more voltage.

Second is that you need to make sure you're reading the same voltage reading as they are. In most motherboards you can read out Vcore which is the output of the VRM somewhere between between the capacitor bank and the CPU base, and there is SVI2 voltage which is the actual core voltage inside the CPU. At various loads they can be vastly different. And then there's something called 'VID' which isn't really a voltage readout at all but people erroneously use it anyway.

Third is your motherboard VRM can have poor power delivery so you'll need a higher voltage to avoid low-side dropouts that make the CPU unstable.

 

[xurmirac]

First off is to understand "too high" a voltage is relative as every CPU is different, some with less leakage current that can function with lower voltage and some with more leakage current that needs more voltage.

Second is that you need to make sure you're reading the same voltage reading as they are. In most motherboards you can read out Vcore which is the output of the VRM somewhere between between the capacitor bank and the CPU base, and there is SVI2 voltage which is the actual core voltage inside the CPU. At various loads they can be vastly different. And then there's something called 'VID' which isn't really a voltage readout at all but people erroneously use it anyway.

Third is your motherboard VRM can have poor power delivery so you'll need a higher voltage to avoid low-side dropouts that make the CPU unstable.

First off is that my English isn't good. I'm gonna answer you as I get, if i get sth wrong, i'm sorry.

My mobo is Gigabyte B450M S2H.

Off course i know that "too high" is relative as every CPU is different. I mean, nobody passes over 1.4V and they get 3,7-3,8-3,9-4,0GHz. My mobo doesn't allow to pass 1.41V and people suggest max 1.425V and they get 4.2GHz on that voltage. Me? Even i can't get 3,9GHz with 1.4V 🙁

As i get, you mean that you might have checked wrong values. I watched videos that they show how to overclock and what are their values with my CPU and my mobo. Third is the related to that already. I agree that my mobo i sn't perfect for O.C. but it shouldn't have meant that i never can do.

 

[drea.drechsler]

First off is that my English isn't good. I'm gonna answer you as I get, if i get sth wrong, i'm sorry.

My mobo is Gigabyte B450M S2H.

Off course i know that "too high" is relative as every CPU is different. I mean, nobody passes over 1.4V and they get 3,7-3,8-3,9-4,0GHz. My mobo doesn't allow to pass 1.41V and people suggest max 1.425V and they get 4.2GHz on that voltage. Me? Even i can't get 3,9GHz with 1.4V 🙁

As i get, you mean that you might have checked wrong values. I watched videos that they show how to overclock and what are their values with my CPU and my mobo. Third is the related to that already. I agree that my mobo i sn't perfect for O.C. but it shouldn't have meant that i never can do.

First thing to do is get HWInfo64. That is the monitoring utility that will tell you what the SVI2 core voltage is.

Second something that puts a heavy load on the system, CPUz will do for now it has a BENCH and STRESS section that's good enough to start.

Now simply set the 1.41 or 1.425 V and 3.9Ghz overclock you're able to get. Now run HWINfo and watch the SVI2 core voltage reading to see what voltage your processor is really getting both when idling around in Windows and under load with the CPUz stress test.

EDIT add: also, just occurred to me...are you positive you have an AF? did you get it in a sealed box with cooler? and checked the heatspreader for markings?

Then too, I have to think it would easy to turn AE's into AF's with the right kind of etching laser. Not that I've heard of it or whether it would be worthwhile... just wondering is all. I think HWInfo might help with CPU info.

 

[xurmirac]

First thing to do is get HWInfo64. That is the monitoring utility that will tell you what the SVI2 core voltage is.

Second something that puts a heavy load on the system, CPUz will do for now it has a BENCH and STRESS section that's good enough to start.

Now simply set the 1.41 or 1.425 V and 3.9Ghz overclock you're able to get. Now run HWINfo and watch the SVI2 core voltage reading to see what voltage your processor is really getting both when idling around in Windows and under load with the CPUz stress test.

EDIT add: also, just occurred to me...are you positive you have an AF? did you get it in a sealed box with cooler? and checked the heatspreader for markings?

Then too, I have to think it would easy to turn AE's into AF's with the right kind of etching laser. Not that I've heard of it or whether it would be worthwhile... just wondering is all. I think HWInfo might help with CPU info.

3,9 - 1.41V setted. On CPUz stress test;

https://imgur.com/y640aUP

View: https://imgur.com/y640aUP


I'm sure that i have an AF. It shows on CPUz "12nm" and "Pinnacle Ridge". Also HWInfo shows same. It was in a sealed box with cooler. I couldn't get rest of them

Edit add: On prime95 small FFTs test pc crashed again. 1.41V 3,9GHz same.

 

[drea.drechsler]

...
Edit add: On prime95 small FFTs test pc crashed again. 1.41V 3,9GHz same.

Well, it was just a thought but good to be sure it's an AF model any way.

And at any rate...do you see the line labeled 'CPU Core Voltage (SVI2 TFN)? The one that's showing your core voltage as 1.075 or so volts in the middle of the stress test? Running extreme heavy loads that should be in the 1.2-1.3 volt range, maybe closer to 1.2 in P95 small FFT's, so it's very little wonder it crashed.

What is that voltage line reading when at idle? it will probably bounce around some so focus on the maximum column. You don't want that to be going over 1.38V at idle. If you have to raise whatever you think is the VCore above 1.41 it should be OK so long as the SVI2 TFN voltage is not going over 1.38V.

When you get it to be about 1.38V when idle, then if it doesn't remain stable then you have to lower clocks until it will. And oh yeah, if it gets way to hot (like up to 90+C) then you have to lower clocks too until you get better cooling on it.

So that's the voltage line you should be looking at now.

 

[kmd89]

hi,
good day, I'm new here and also new to OC for Ryzen CPUs.
Recently changed my platform from old Intel i7 3770 to Ryzen 5 1600 AF and decided to check the OC for sports. Quite some years ago I had done OC on LGA775 to C2D and a good OC on oldish 2500k and was sitting for very long on a i7 3770 with turbo oc only.

I was reading this thread and saw the SVI2 TFN in the HWinfo. In the past I always used CPUz core voltage.
And just when I had though my CPU is just simply bad as was getting OC 3800 at almost 1,4V in CPUZ. Then I saw in HWinfo that the voltage there is with a difference of 0,1V between the readings.
Question now which is the correct value for Ryzen??
In bios I also have a way lower value for the voltage and indeed the CPUZ vcore seems just high...

Under OCCT stress at 3800:
screen
reading:
hwinfo ~1,287V
cpuz - 1,363V
occt - 1,37V