OFFICIAL 3900X and 3900XT Overclocking thread - Page 9 - Overclock.net - An Overclocking Community

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OFFICIAL 3900X and 3900XT Overclocking thread

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post #81 of 91 (permalink) Old 07-30-2020, 01:14 AM
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VDDG voltage on 3900xt

Mine is 1050 from start, if I try to lower it to like 950 it wont boot.
Someone know if they config the XT versions to use more voltage than before? Seems kinda odd that you need that high voltage.

I am thinking of returning the XT cpu and buy a X one instead, people claim you got better oc capabilities but tbh, you cant raise bclk, you cant go over 1900 FCLK etc etc..

When using my 3800x my mem could do 1933 FCLK etc, but when switching cpu they can only do 1900 FCLK.

I shouldnt complain, I get really good scores in Aida64 with my mem oc, changed them so they run pretty damn fast at 1900, 63,1 - 63,5 NS.

Membench done in 100,33 sec etc.. But I wanna use bclk OC and it seems that it aint working with XT cpus.

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post #82 of 91 (permalink) Old 07-30-2020, 09:07 PM
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Thought I'd try fixed 1.225 Vcore for 1.2v for my 3900xt.

Used p95 29.8 b6 small fft for 30min.

4450/43.25

CB20 7911
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post #83 of 91 (permalink) Old 07-31-2020, 02:19 AM
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Quote: Originally Posted by glnn_23 View Post
Thought I'd try fixed 1.225 Vcore for 1.2v for my 3900xt.

Used p95 29.8 b6 small fft for 30min.

4450/43.25

CB20 7911
okey sounds nice, but what single score in CR20?

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post #84 of 91 (permalink) Old 07-31-2020, 06:27 AM
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Quote: Originally Posted by glnn_23 View Post
Thought I'd try fixed 1.225 Vcore for 1.2v for my 3900xt.

Used p95 29.8 b6 small fft for 30min.

4450/43.25

CB20 7911
That's extremely impressive for this voltage. I need closer to 1.26-1.27 to get those scores. Then for me heat becomes an issue on sustained loads. My office is fairly small and ambient temp is affected by the PC.

I just went from 44-45-43-43 @1.26 stable - to 44-44-43-43 @1.25 stable. I can fun FAH 100% now for about 40m straight temps in the 78-82C range. My 1.26v config would be about 3-4C warmer If outside throws a summer heatstroke at me that will be a different story lol.

You have a better example of the 3900xt than most it seems.
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post #85 of 91 (permalink) Old 07-31-2020, 01:24 PM
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Quote: Originally Posted by Dyngsur View Post
Mine is 1050 from start, if I try to lower it to like 950 it wont boot.
Someone know if they config the XT versions to use more voltage than before? Seems kinda odd that you need that high voltage.

I am thinking of returning the XT cpu and buy a X one instead, people claim you got better oc capabilities but tbh, you cant raise bclk, you cant go over 1900 FCLK etc etc..

When using my 3800x my mem could do 1933 FCLK etc, but when switching cpu they can only do 1900 FCLK.

I shouldnt complain, I get really good scores in Aida64 with my mem oc, changed them so they run pretty damn fast at 1900, 63,1 - 63,5 NS.

Membench done in 100,33 sec etc.. But I wanna use bclk OC and it seems that it aint working with XT cpus.
Yes, XTs use voltage to achieve the higher clocks. The PB2 behavior is far more aggressive in multicore workloads than x chips, at least that's how my 3600xt behaves.

FCLK is sample specific, not model specific.

3900x - 1910 fclk
3600xt - 1907 fclk

As long as you're hitting 1900 be happy, a lot of samples won't even hit 1900.

Regarding my settings, on my board I don't set ratio just FCLK and MCLK directly, so yes I lower the divider to get them to target 1900ish frequency.

LLC 2 on C7H is 2nd lowest.

Last edited by tcclaviger; 07-31-2020 at 01:33 PM.
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post #86 of 91 (permalink) Old 08-02-2020, 10:50 PM
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Quote: Originally Posted by tcclaviger View Post
Yes, XTs use voltage to achieve the higher clocks. The PB2 behavior is far more aggressive in multicore workloads than x chips, at least that's how my 3600xt behaves.

FCLK is sample specific, not model specific.

3900x - 1910 fclk
3600xt - 1907 fclk

As long as you're hitting 1900 be happy, a lot of samples won't even hit 1900.

Regarding my settings, on my board I don't set ratio just FCLK and MCLK directly, so yes I lower the divider to get them to target 1900ish frequency.

LLC 2 on C7H is 2nd lowest.
Tryed another 3900Xt, cant even boot into win10 with 1900fclk... GG me...

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post #87 of 91 (permalink) Old 08-07-2020, 03:46 AM
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Can anyone tell me how to get the most out of the 3900x without overclocking it please? specs of build in sig below thanks

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post #88 of 91 (permalink) Old 08-07-2020, 04:42 AM
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Quote: Originally Posted by rchads89 View Post
Can anyone tell me how to get the most out of the 3900x without overclocking it please? specs of build in sig below thanks
Depending on your cooling solution the easiest way is to optimize PBO. Manually set PPT, TDC and EDC, scalar and apply a slight negative offset to vcore. I set my values so that when Cinebench R20 is running I hit about 80% of the maximum on those values. For me that is PPT 188w, TDC 125A, EDC 208A and scalar x6. Negative offset is -0.0625. As for offset that will vary by chip and you have to find stability. A quick way to do this is to pick an offset and run Prime95 Small FFT, too low of an offset will cause certain workers (your weakest ones) to fail pretty quickly. Keep bumping up your offset a little bit at a time until workers do not fail. I'm no expert but have been playing around with these settings for a year to try and dial it in and it's kind of like trying to hit a moving target at times. Lots of changes for relatively small gains. If you can keep your temps below 70c during heavy workloads (e.g. CB20) then your chip should boost pretty well in single and multi-thread.
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post #89 of 91 (permalink) Old 08-07-2020, 05:16 AM
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Quote: Originally Posted by MikeS3000 View Post
Depending on your cooling solution the easiest way is to optimize PBO. Manually set PPT, TDC and EDC, scalar and apply a slight negative offset to vcore. I set my values so that when Cinebench R20 is running I hit about 80% of the maximum on those values. For me that is PPT 188w, TDC 125A, EDC 208A and scalar x6. Negative offset is -0.0625. As for offset that will vary by chip and you have to find stability. A quick way to do this is to pick an offset and run Prime95 Small FFT, too low of an offset will cause certain workers (your weakest ones) to fail pretty quickly. Keep bumping up your offset a little bit at a time until workers do not fail. I'm no expert but have been playing around with these settings for a year to try and dial it in and it's kind of like trying to hit a moving target at times. Lots of changes for relatively small gains. If you can keep your temps below 70c during heavy workloads (e.g. CB20) then your chip should boost pretty well in single and multi-thread.
I have something in bios called game boost or something i usually just run that it worked well on my 3800x can i not just do that?

I only changed from the 3800x to a 3900x because it cost me literally nothing to do so.

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post #90 of 91 (permalink) Old 08-08-2020, 07:44 AM
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If I have a Aorus master X570, and a 3900xt, what could be a good stsrt volatfe for an allcore 4.4-4.5 ghz. Could someone help me out.

Dunno exactly where i can change the stuff in bios when ccx clocking, cause i guess you get the most of oc with ccx than normal PBO?

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Cooling
Corsair Hydro H150i PRO RGB
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