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post #1 of 19 (permalink) Old 07-24-2019, 11:33 AM - Thread Starter
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Help with undervolting FX-9590

Hi all,

So it's summer and i live in a house that has no AC and is old wooden floor and its around ambient 32c spiked at 35c outside so cant tell what it is inside my room. And it only going to get warmer!

Idle temp cpu 36c to 38c

Im using a custom water cooling loop. D5 pump top, Koolance CPU-380A, 480 radiator.
Motherboard: TUF SABERTOOTH 990FX R3.0
RAM: Corsair Vengeance 4x4GB

I never done undervolting or overclocking this 220W cpu.

What i want to ask you guys how to undervolt my cpu currently its at 1.5v
I want to lower it but still run at 4.7GHZ
Some guy lowered the voltage to 1,368 V still runs at 4.7GHZ. And also lowered his temps.

Link:
https://linustechtips.com/main/topic...peratures-and/

Can some one tell me what to change in the BIOS in a simple manner without harming my pc. Note i just use stock settings.
Is it just simply lowering the cpu voltage and thats it?

Anyway help is much appreciated
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post #2 of 19 (permalink) Old 07-24-2019, 11:48 AM
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Quote: Originally Posted by Cobra26 View Post
Is it just simply lowering the cpu voltage and thats it?

yes.

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post #3 of 19 (permalink) Old 07-24-2019, 12:00 PM - Thread Starter
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Quote: Originally Posted by The Pook View Post
yes.
Thanks for the reply,

Could you give the specific option name in the BIOS in order for me to lower the voltage. Just to verify are you sure that's the only thing i need to change no other settings like turn of turbo etc?

Example:

1.5+ VCORE to say 1.368 and disable TURBO as well as LLC?
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post #4 of 19 (permalink) Old 07-24-2019, 12:15 PM
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you're not going to get 1.368v stable on a 9590 without underclocking.

LLC deals with vdroop. If vdroop is fine now, there's no reason to change it.

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post #5 of 19 (permalink) Old 07-24-2019, 12:25 PM - Thread Starter
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Quote: Originally Posted by The Pook View Post
you're not going to get 1.368v stable on a 9590 without underclocking.

LLC deals with vdroop. If vdroop is fine now, there's no reason to change it.
Thanks again,

Yeah underclocking 4.7GHZ is plenty with turbo it can reach 5GHZ with turbo no need for that. So have to disable TURBO correct?
So what would you do? In order to lower temps obviously lowering the vcore to 1.368 and let it stay @ 4.7GHZ (disabled turbo). Im no expert when it comes down to overclocking or underclocking.
Can you give me a simple setup what to change in the BIOS without to much risk. Maybe lowering to example 1.368 is to low but something a little bit higher is also fine as long as it gets lower temps and stability.
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post #6 of 19 (permalink) Old 07-24-2019, 12:46 PM
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FX-9590 was binned for high leakage so undervolting and, as The Pook suggested, 4.70 GHz

I would manually set 4.7GHz (disable Turbo) and start at 1.40 volts and keep on dropping volts after every stability test. keep paper and pen handy.
After finding your chips sweet spot you can switch to offset for vCore in BIOS or try MrsTweaker.

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post #7 of 19 (permalink) Old 07-24-2019, 01:57 PM
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Worst voltage hog I've ever owned surprised it was able to do this. I'll try some other stuff with it and report back. ( the thing hits 1.58 volts at default turbo speeds/core volts without llc boosting it). 240mm clc cooling it , 22c ambient.

Will run Aida 64 stress test for about 20 mins before a cache fail - seems like it would run forever without the cache being stressed. 4x4 mem at 2400 is a pretty tall order for FX.

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post #8 of 19 (permalink) Old 07-24-2019, 08:41 PM - Thread Starter
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Ok...

So i went into the BIOS disabled AMD turbo core. Must i use "Offset" or "Manual"?
Proceed to CPU voltage current @ 1.512v so i tried to lower it to 1.400v is it 1.512 - 1.400 = 0.112?
Is 0.112 the sequence you need to type or just 1.400? I did on both and got some numbers but i didn't trust it so i used F5 and bring it back to "optimal default" but still disable Turbo. Press F10 save exit.

Gosh i sound like a complete NOOB terrible sorry guys!
I can build pc, do custom watercooling, BIOS update but i never thinkered with overclocks nor underclocks. Even something simple like lowering the voltage...

Last edited by Cobra26; 07-24-2019 at 09:02 PM.
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post #9 of 19 (permalink) Old 07-25-2019, 08:23 AM
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I don't remember how I did it but my 9590 at 4.7 ghz ran at 1.425 volts and was stable. Still have it.

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post #10 of 19 (permalink) Old 07-25-2019, 02:22 PM
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Best way to get lower voltage and higher clocks is going with chilling. The hotter FX runs, the more voltage it will want to consume.
As mentioned very high leaker, so really good for sub ambient and sub zero clocking.

You could also drop it to a quad core to significantly lower temps to utilize a higher voltage to achieve a higher clock speed assuming you don't need all 8 cores.

From some testing I've done, around 0-5c load and 2 cores would produce clocks at 5.6ghz and using 1.560v (bench stable testing - not daily) are some numbers I came up with with a FX-8350. Same cpu at 5.4Ghz was able to test and run benches at 1.464v. 5.2ghz at 1.440v and sub zero.
These are examples with 2 cores enabled under TEC cooling solution.

FX is temp limited, not voltage limited. Find a way to run it cooler.


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