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Ryzen 3000 core voltage - please clarify

 
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post #1 of 7 (permalink) Old 01-03-2020, 07:44 AM - Thread Starter
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Ryzen 3000 core voltage - please clarify

Ok, I need some help understanding the wording people use when discussing their Ryzen 3000 (Zen 2) manual overclocks.

Example: "I was able to run my 3900X at 4.4GHz @ 1.30V!"

What exactly does the "@ 1.30V" refer to?

Is that the voltage set in BIOS or is that the voltage measured under an all-core 100% workload?

If it's the BIOS setting, isn't the LLC setting highly relevant? Yet people rarely list this.

Should there be any concerns over idle or single threaded voltages? It seems stock settings with PBO allow this to get up to 1.45V.


Thanks for your help educating me before I attempt a manual overclock!

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post #2 of 7 (permalink) Old 01-03-2020, 10:25 AM
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it means whatever that person meant, lol. ask them. it should be what voltage the CPU needs at 100% all core load to be stable.

I (usually) don't list what LLC I'm using when telling people my OC because it's irrelevant information, and all that matters is what voltage the CPU is getting and not what I set in the BIOS.

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post #3 of 7 (permalink) Old 01-03-2020, 10:41 AM
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It's best to research the chip and socket when you want to OC.

Some people don't have to fiddle much with their Bios to be stable at for example 1.3v and others have to dig deeper into the various Bios settings to achieve the same results. It all depends.

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post #4 of 7 (permalink) Old 01-03-2020, 11:29 AM - Thread Starter
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Quote: Originally Posted by The Pook View Post
it means whatever that person meant, lol. ask them. it should be what voltage the CPU needs at 100% all core load to be stable.

I (usually) don't list what LLC I'm using when telling people my OC because it's irrelevant information, and all that matters is what voltage the CPU is getting and not what I set in the BIOS.
Good to hear this because this is what I would state as well as it is the most relevant. I didn't want to screw up and set 1.4V in BIOS to hit a measured 1.3V under load and find out what people really meant was to set 1.3V in BIOS and have it droop to something lower. The risk of assuming people are talking about 100% load voltage is much higher than assuming the BIOS setting.

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post #5 of 7 (permalink) Old 02-14-2020, 12:25 AM
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This should dispel doubts about what an LLC is and what it is used for https://elmorlabs.com/index.php/2019...ne-visualized/
Really nice article.

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post #6 of 7 (permalink) Old 02-14-2020, 03:30 AM
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When I still had the C7H mobo I was initially using the highest LLC setting for vcore. I read some things about it where high LLC sometimes create voltage spikes only visible with an oscilloscope. But I tested the vcore on the mobo's probelt with a multimeter and found a very minute drop with cpuz giving the most accurate vcore reading.

I then played with all of the LLC settings to see the differences and it was significant going lower on LLC.

I then tried AUTO instead of a set LLC and AUTO actually gave me the best vcore as in exactly what was set in the bios. I can also confirm it to be the same with my Msi Meg X570 Ace mobo.

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post #7 of 7 (permalink) Old 02-14-2020, 08:02 AM
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99% of the time, the person is reporting what vcore settings they input, not what the voltage stabilized at while under load.

You have to ask them to be sure, people in general are bad at being precise.

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