Ryzen 3rd gen Core Voltage

[Eumel2]

I just saw this video:

Is this legit?

Can someone check this?

[Jurrunio]

He's stressing everything with words like "you have to" and "otherwise it won't run properly", implying there are serious consequences to which there are not.

 

All Ryzen 3rd gen does when you set voltage too low for that frequency is that the performance starts to drop even though it doesn't crash, that's why you have to validate each voltage and frequency setting with benchmarks on top of stability, say Cinebench R20 and 3DMark Fire Strike physics score. If you think stock voltages (safe btw) makes you uncomfortable, you can undervolt and underclock the CPU, no one's stopping you. 

 

Cool'n quiet is just a power saving feature, with it disabled the CPU will just burn more power.

 

None of these cause irreversible damage.

 

Bad software choice too. Since Zen 2's clock modulation works faster than other CPUs, you need Ryzen Master to read the clocks properly.

 

The only thing totally correct is that the CPU runs a single core at max speed and max voltage in the bios. AMD did make the power management on single threaded workloads super aggressive, way too aggressive if you ask me. Guess they are doing everything to break the "AMD single core performance suck" image.

[bignaz]

3 minutes ago, Jurrunio said:

He's stressing everything with words like "you have to" and "otherwise it won't run properly", implying there are serious consequences to which there are not.

 

All Ryzen 3rd gen does when you set voltage too low for that frequency is that the performance starts to drop even though it doesn't crash, that's why you have to validate each voltage and frequency setting with benchmarks on top of stability, say Cinebench R20 and 3DMark Fire Strike physics score. If you think stock voltages (safe btw) makes you uncomfortable, you can undervolt and underclock the CPU, no one's stopping you. 

 

Cool'n quiet is just a power saving feature, with it disabled the CPU will just burn more power.

 

None of these cause irreversible damage.

 

Bad software choice too. Since Zen 2's clock modulation works faster than other CPUs, you need Ryzen Master to read the clocks properly.

 

The only thing totally correct is that the CPU runs a single core at max speed and max voltage in the bios. AMD did make the power management on single threaded workloads super aggressive, way too aggressive if you ask me. Guess they are doing everything to break the "AMD single core performance suck" image.

 

 

Intel wish's they did that. They would bee selling 5.3ghz i9's lol.

 

But year there single core voltages are through the roof. I mean there safe and will last at a min of 3 years but PBO gets really aggressive with single core voltages. I seen 3600's pull 65w fur 100% load across all cores then pbo put it to 65w load for 1 core. Thats just crazy.

[Jurrunio]

1 minute ago, bignaz said:

But year there single core voltages are through the roof. I mean there safe and will last at a min of 3 years but PBO gets really aggressive with single core voltages. I seen 3600's pull 65w fur 100% load across all cores then pbo put it to 65w load for 1 core. Thats just crazy.

I hope they dont do the same on laptops. A mere annoyance on desktop will be a massive throttling pain on laptops.

[Eumel2]

19 hours ago, Jurrunio said:

All Ryzen 3rd gen does when you set voltage too low for that frequency is that the performance starts to drop even though it doesn't crash, that's why you have to validate each voltage and frequency setting with benchmarks on top of stability, say Cinebench R20 and 3DMark Fire Strike physics score. If you think stock voltages (safe btw) makes you uncomfortable, you can undervolt and underclock the CPU, no one's stopping you. 

Im not worried about stock really but since anthony recommended a 1,35 V core i was wondering if that does actually reduce single core performance or alternatively is a big waste of electricity of they cant tune down the voltage on lower loads

[Jurrunio]

12 minutes ago, Eumel2 said:

Im not worried about stock really but since anthony recommended a 1,35 V core i was wondering if that does actually reduce single core performance or alternatively is a big waste of electricity of they cant tune down the voltage on lower loads

It may or may not drop performance. It depends on the CPU you're using (silicon lottery). Anthony presumably is being safe here since it's risky to recommend aggressive voltages without knowing whether something else nad is going on

[Guest]

On 8/27/2019 at 5:02 AM, Jurrunio said:

It may or may not drop performance. It depends on the CPU you're using (silicon lottery). Anthony presumably is being safe here since it's risky to recommend aggressive voltages without knowing whether something else nad is going on

Basically yeah. I was also taken to task on it as being too high in the overclocking guide video as a result of The Stilt's findings on silicon degradation past 1.325V... But he's talking about high currents. In other words, setting even higher than 1.35V isn't going to hit 1.325V at full load due to vdroop unless you've got really aggressive LLC enabled, so it's a safe value.

 

Steve over at Gamers Nexus did a video on undervolting Ryzen 3rd-gen and found that Ryzen can and will undervolt well, unless you go too low. In the case of the overclocks I was able to achieve, thermals were the big constraining factor on the 3900X, while the 3700X and 3600 were limited primarily in terms of silicon - Higher voltages did nothing for stability nor performance.

 

TL;DR 1.35V maximum manual voltage setting is mainly a guideline based on my observations and not wanting to stray too close to the sun on silicon degradation. The maximum safe voltage in general was determined to be 1.47V, although transient voltages will be higher than that even at stock and that's fine - It's sustained you need to worry about.

 

A note regarding voltages and hardware monitors: Some core voltages will remain "high" at idle as a result of software being incapable of reading the state of a parked core, which means the last measurement before parking becomes the "current" measurement whether it's accurate or not. Ryzen Master can show the status of each core and their true current clocks, but unfortunately doesn't show each core's voltage as HWINFO does.

 

Much of this is also going to vary from board to board, BIOS to BIOS, and chip to chip. Early BIOSes had poor voltage management, so in these cases the CPUs might have been starving or otherwise not boosting properly. This is less of a concern now.

[Eumel2]

@GabenJr If i pin it at 1.35V can it still reduce it voltage to save energy (and heat) when it idles?

[Mallith]

On 8/29/2019 at 2:12 AM, Eumel2 said:

@GabenJr If i pin it at 1.35V can it still reduce it voltage to save energy (and heat) when it idles?

The CPU will automaticly draw less voltage (if you do it via ryzen master) when you are idling.