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tappytap
Journeyman III

3700x OC What do you recommend? I'm running 4.4GHZ all cores on 1.4V right now.

 What do you recommend? I'm running 4.4GHZ all cores on 1.4V right now. I'm also running an h100i rgb platinum, I idle at 39-40C and while running Cinebench R15 I see 63-64C.

Some people say that 1.4 is a significant amount of voltage, but I reverted the OC and went to factory and my voltage was staying at 1.45 while idling, and 1.5 under load!

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5 Replies
cosmicdance
Elite

Re: 3700x OC What do you recommend? I'm running 4.4GHZ all cores on 1.4V right now.

You're fine up to 1.45 volts on a permanent basis. 

How does it hold put under gaming?

When I tried OC my 3700X it would be stable in Cinebench up to 4350 MHZ but freeze during gaming.  

I just run it at stock now with PBO Enabled.  

Andy

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tappytap
Journeyman III

Re: 3700x OC What do you recommend? I'm running 4.4GHZ all cores on 1.4V right now.

So far it's been really stable, I have never crashed in game, but when I run Cinebench R20 it typically crashes. It doesn't do it for R15 which is strange.... I'm just happy I'm holding on to 98.8 %tile on userbenchmark lol. https://www.userbenchmark.com/UserRun/24798322 

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papoulka
Adept I

Re: 3700x OC What do you recommend? I'm running 4.4GHZ all cores on 1.4V right now.

Everything seems "fine" as-is; given that you apparently have a good cooler and don't mind the extra 24/7 heat from the manual OC.  Personally I'd just let the Ryzen PBO etc do its job, and would place a small bet that you'll end up there too.

That said, my only suggestion is that 1.4V at load indicates Load Line Calibration in action, which is probably unnecessary.  You could try turning it off ('Mode 8' on an MSI BIOS) and then run your same benchmarks.  See if the scores drop and / or if CPU package power changes.  You may well get the same performance with significantly less heat and somewhat lower temperatures / wear / noise.  If you do try that, please report back on the results.

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zx128k
Adept I

Re: 3700x OC What do you recommend? I'm running 4.4GHZ all cores on 1.4V right now.

People are posting on reddit that they get degradation above their cpu's FIT and Fmax. 

So the idea goes, you run prime95 with PBO on 8k fft and power limits set to maximum.  Then you record the fmax and FIT voltage.  With my 3800x FIT will be 1.306 volts to 1.344 volts.  So 1.306 volts is the max constant safe vcore.  Fmax at this voltage is 4.2GHz.  So to get to 4.3GHz which is a 2.4% overclock.  You have to reduce the FIT voltage by 2.4%.  So my new FIT for that frequency is 1.275627906976744186046511627907 volts vcore.

‭4.3/4.2*100= 102.38095238095238095238095238095‬

1.306/1.275627906976744186046511627907 volts = ‭1.0238095238095238095238095238095‬

102.38095238095238095238095238095‬/‭1.0238095238095238095238095238095‬=100

Would imply that there is no safe overclocking left for the cores.  You should focus on the RAM.  Whither it's true or not.... but people are reporting degraded chips.  Wonder what AMD thinks about this....

So yeah, 1.325V is not safe. The maximum safe voltage for your personal zen 2 cpu is... I have no clue. If you want to be able to find this voltage turn on PBO and max PPT, TDC and EDC and run a worse-case workload as of The Stilts recommendation.

Also do not push past the Fmax on your cpu while at maximum FIT voltage. It can actually make the situation your cpu is in dangerous and add a risk of degradation.

If you have any questions feel free to ask :)

TLDR Pushing past your chips maximum FIT voltage is not safe and will cause accelerated degradation.

source

"For x% over fmax, voltage must be lowered by x% of the maximum FIT voltage, in theory anyways, that may not be safe in actuality. Though I would doubt it not being safe." - MadLad81#9445 (discord tag)

If you push over Fmax you are going over the rated spec meaning your current draw will be higher then spec. Let's just say at 4.2ghz 1.3V you are pulling 100A. In this situation you are on the FIT maximum voltage and on the Fmax so you are within spec.

If you then raise the clocks to 4.242ghz at the same 1.3V your current will be ~101A. Due to close to linear current increase when frequency is raised. (4.242/4.2 * 100 = 101)

Now if you lower your voltage by the same amount you raised your frequency (1%) your current will be back in safe limits. This works because voltage raises or lowers current by the same amount that is was changed. (101 / (1.3/1.287) = 99.99)



View: https://www.reddit.com/r/overclocking/comments/ejd5c9/1325v_is_not_safe_for_zen_2/fcxrk78/

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dimmestStraw
Journeyman III

Re: 3700x OC What do you recommend? I'm running 4.4GHZ all cores on 1.4V right now.

Wild, I'm doing 4400MHz all core at 1.285V with big droop LLC...

With per-CCX I got 4500MHz on the first four and 4450MHz at 1.325V, again big droop LLC settings... I'm not saying this to be a **bleep**, I'm letting you know that it's pretty highly likely you don't actually need all that voltage

 

 

 

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