[davidelite10]

Good info, my 3900x arrives today I'm excited to see what I can push on it.

Didn't have much time last night to mess with it but I got to 4.3ghz on 1.25v stable, however ram isn't running at it's proper speed need to mess with that later.
Got around 7405/7415 on Cine R20 with the ram at 2133mhz. Hoping getting the ram to 3200mhz and FCLK to 1800mhz to pump it up to where it should be hopefully around 7600.

4.4 at 1.35v all core wouldn't work, might try it at 1.4v but don't want to run it too high on voltage. Also this chip is INCREDIBLY cool even at 1.25v full load. Never touching above 60C in gaming so far in VR.

Going from a i7 4770k to a R9 3900x removed my bottlenecks in VR which is great, haven't tested other games like Arma or DCS yet.

 

[hypespazm]

Didn't have much time last night to mess with it but I got to 4.3ghz on 1.25v stable, however ram isn't running at it's proper speed need to mess with that later.
Got around 7405/7415 on Cine R20 with the ram at 2133mhz. Hoping getting the ram to 3200mhz and FCLK to 1800mhz to pump it up to where it should be hopefully around 7600.

4.4 at 1.35v all core wouldn't work, might try it at 1.4v but don't want to run it too high on voltage. Also this chip is INCREDIBLY cool even at 1.25v full load. Never touching above 60C in gaming so far in VR.

Going from a i7 4770k to a R9 3900x removed my bottlenecks in VR which is great, haven't tested other games like Arma or DCS yet.

are you running 4.3 on all cores? at 1.25?

 

[davidelite10]

are you running 4.3 on all cores? at 1.25?

Yup! Got lucky there, just doesn't want to push 4.4 yet, going to mess with it.

1.25v stable in 99% loads, fails in Small fft in prime95 after 10 minutes, but after bumping to 1.3v it stuck for 20 no issue.
Realistically 1.25v or 1.275v is where I can keep it with no issues in gaming(3 hours vr no problem last night, and rendering in blender, and unity).

EDIT: I was able to 4.4 on some cores with per CCX clocking on 1.3v but want all across the board.

 

[Bal3Wolf]

Yup! Got lucky there, just doesn't want to push 4.4 yet, going to mess with it.

1.25v stable in 99% loads, fails in Small fft in prime95 after 10 minutes, but after bumping to 1.3v it stuck for 20 no issue.
Realistically 1.25v or 1.275v is where I can keep it with no issues in gaming(3 hours vr no problem last night, and rendering in blender, and unity).

EDIT: I was able to 4.4 on some cores with per CCX clocking on 1.3v but want all across the board.

my 3900x will do 4.3 all core on 1.23-1.26 prime95 1hr stable didnt really push that much longer, I can do 44 on first chiplet and 43 on 2nd with 1.26-1.30 i only pushed that for 15mins on prime then used other stuff to test it stable.

 

[davidelite10]

my 3900x will do 4.3 all core on 1.23-1.26 prime95 1hr stable didnt really push that much longer, I can do 44 on first chiplet and 43 on 2nd with 1.26-1.30 i only pushed that for 15mins on prime then used other stuff to test it stable.

That's a good chip mang! Going to try going for 4.4 at 1.325v to see if it sticks after I get the mem to where it should be.
Hopefully doesn't mess with my stability.

 

[Bal3Wolf]

That's a good chip mang! Going to try going for 4.4 at 1.325v to see if it sticks after I get the mem to where it should be.
Hopefully doesn't mess with my stability.

Yea i just got my memory tuned the other day 3200mhz clocked at 3533 crappy samsung c die memory.

 

[davidelite10]

Yea i just got my memory tuned the other day 3200mhz clocked at 3533 crappy samsung c die memory.

What fclk are you set at? Did you get any noticeable gains from it?

 

[Bal3Wolf]

What fclk are you set at? Did you get any noticeable gains from it?

setting on auto that is set to 1766 which is running 1:1 with memory i tried setting it to 1800 with memory still at 3533 and my latency went up to 85 so i put it back to auto that gets me 70-70.5.

 

[davidelite10]

setting on auto that is set to 1766 which is running 1:1 with memory i tried setting it to 1800 with memory still at 3533 and my latency went up to 85 so i put it back to auto that gets me 70-70.5.

Cool thanks brother, will post some screens on cine and updates when I get home.

 

[SpecChum]

Just throwing my hat in the ring on this one, but I've changed cooling solution since this; was H110i AIO before, but now a 3 x 360mm rad custom loop, so I need to test again at some point.

My 3900x is about 6 weeks old now and does 4.3GHz @ 1.181v (1.275v set in BIOS, auto LLC brings it down to 1.181v during P95 Small FFT) which was the FIT voltage with the H110i; not really had time to play since I got the custom loop set up, so I suspect the FIT voltage will go up slightly due to lower temps.

Also does 1800 FCLK with vSOC at 1v, not tried higher yet. This again has auto LLC, 1.025v set in BIOS, droops to 1.006v "idle" and 1.0v during heavy RAM loads like TM5.

Currently running stock with CB20 score 7302 - I use the PC for work, so not much chance to play with it recently.

Will update as I do

 

[JLMS2010]

My first time with an AMD CPU in YEARS, but I love the 3900X. I have mine set to all core 43.25 @ 1.264v with 1900 FCLK using GSkill memory. It's stable as I've been using it for the last week and a half now. I was planning to get the 3900XT, but some work related expense arose. :O

 

[SpecChum]

OK, quick update.

1900 FCLK works fine...and at 1v SOC :stun::bigeyedsm

1933 didn't boot even at 1.1v SOC and I couldn't be bothered to tweak VDDG etc

Still, 1v SOC at 1900 seems a bit...bizarre?

I've put ram up to 3800 and running TM5 now...

 

[SpecChum]

Update...

Had some time to play today and even tho TM5 passed and RealBench passed 1hr, I got a single WHEA error, but a slight bump to 1.019v SOC fixed that.

Overall I'm quite happy, going on posts on here and around the net that vSOC is quite low for a stable 1900 FCLK.

 

[Shenhua]

System:

Define S, 3 x nf a14 front intake, 1 stock fan rear exhaust. Front panel and filter removed.
Cooler nh d15
Mobo crosshair 6 hero (bios 7803)
3900x

In prime95 at 4,3ghz, 1,275v, 160w (core+soc power) hits 93-94ºC at max fan speed and 25ºC ambient temperature, which would make about 70ºC delta. Is that normal? Isnt that too much? Ik ryzen 3000 thermal density is high, but im seeing GN temps with 198w on 3950x (same exact internal layout like 3900x) sitting at 55ºC delta on a test bench, which is probably worst compared to the "wind tunnel" i have here.

 

[csoren]

Here's mine. I haven't had an AMD system since the K6-2 days, so tweaking this one was a lot of fun. Getting the last additional 50 MHz on two of the CCX'es increased voltage and temperature (+5 C) maybe a little too much. I'm still comfortable with this setup but may take those two back down a notch.

MB: ASRock Steel Legend X570
Cooler: Noctua NH-D15 (two fans)
Case: Corsair Carbide 275R TG Airflow (three fans)

CPU: 3900X
Batch: 1951SUT
CCX's: 4450 / 4450 / 4300 / 4350
RAM: G.Skill Ripjaws V 3600 CL16
Infinity fabric: 1800
AIDA latency: 69.8 ns

Ambient temp: 25 C
Temp idle: 35 C
Temp typical gaming: 60-65 C
Temp full AVX load: 85 C
Voltage full load: 1.312 (VID 1.35, LLC 1)

Scores: (median score of 11 runs)
Cinebench 20: 7852 (min: 7832, max: 7905)
Geekbench 5: 13754 (min: 13672, 13815) (median single core: 1349) (https://browser.geekbench.com/v5/cpu/2933569)
Geekbench 4: 52364 (min: 52129, max: 52510) (median single core: 6095) (https://browser.geekbench.com/v4/cpu/15630128)

 

[PraiseKek]

Is this any good?

 

[betam4x]

Voltage is way too high. You need to get it down close to 1.2V or you will kill your chip.

 

[kapf1979]

Hi all,

Finally upgraded from my old I7 3820 @4.5mhz to the new R9 3900x along with a Asus ROG X570-F Gaming, 32Gb Corsair 3600mhz (C18), Corsair H115i Platinum AIO, 1Tb Corsair MP600 m.2. I'm still using my old Asus STRIX GTX 1070 Ti which is fine for now. I'm very happy with the performance improvement as you can imagine! From reading many forums out there, the CPU stock voltage appears to be a topic of concern.

For my Asus X570-F (Bios 2407 July 2020) my stock voltage was something like 4.2v and base temp from Bios at 40+ degrees C. I have played around with it for 2 weeks now and have a stable all core OC of 4.3mhz @ 1.3v. DIGI + VRM set to VDDCR Level 2 @ 110% and VDDCR SOC Level 3 @ 120%. PBO is disabled and DOCP set to 3600 as per my RAM spec. I have not touched the timings. Everything else set to auto.

Within the OS, my temps are at 40 degrees C on idle and jump to 74 Degrees C on full load on Cinebench R20 with a score of 7499 and single core 496. I did try 4.4mhz leaving everything else the same and again stable with temp of 78. I've kept it at 4.3mhz for now.

From everyone's experience with the 3900x does this sound safe? I've read so many forums with an array of settings for a stable 4.3 OC. Some keep CPU voltage at auto and use a negative offset of -0.1v but as the stock voltage for my MOB was set too high, I kept set voltage to 3v.

I had fun with the initial build due to micro stuttering on everything but found doing a fresh install again but disabling MS driver update (Not MS software update) and downloading drivers / chipset direct from ASUS and AMD done the trick. Though initially I had a faulty component but all okay thankfully!

Any recommendations / assistance on recommendations on voltage for 4.3ghz would me much appreciated.

 

[tcclaviger]

Is this any good?

Please provide more info on setup, ram timings, EDC/TDC/PPT values during run and temperatures too if you don't mind. Vcore and LLC would be great too!

I have a good 3900x and 6580/53750 is where it tops out.

I'm currently torn between a 3900xt and 3950x, the 3900x is going wife's PC so I have room for a new baby, which will go to her at Zen 3 release and the 3900x will go to eBay lol.

In theory they should have the same clocking potential, but, I dunno, I suspect the XT will do better.

 

[kapf1979]

My first time with an AMD CPU in YEARS, but I love the 3900X. I have mine set to all core 43.25 @ 1.264v with 1900 FCLK using GSkill memory. It's stable as I've been using it for the last week and a half now. I was planning to get the 3900XT, but some work related expense arose. :O

Hi, did you change the LLC in your bios to achieve this? If so, what settings? Thanks