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Ryzen 3900X thread

Panos said:
Advanced\AMD CBS\NBIO Common Options\XFR Enhancement\Accepted

Set Precision Boost Override Manual
PPT Limit 999
TDC Limit 999
EDC Limit 999
Overdrive Scalar - Manual
customized - 5x

However make sure the actual PBO is OFF that's under
Advanced\AMD Overclocking\Accept\Precision Boost Overdrive
Set Precision Boost Overdrive - Disabled

Wording might seem weird, especially why we are turning on boost under the XFR settings but disabling it on the actual PBO settings. But works like a charm with the 1usmus powerplan :)

And that because I am trying to push the system to it's limits because X4 is hammering hard 2 cores (constant 100% load) and lightly 4-8 cores (60-80% load) depending the area we are in.
eg quiet areas is pretty low, on battlefield areas where there are dozens of ships per side it cranks the core usage up.

So with the above settings I get a 4600 & 4650 2 core 100% hammering for hours, while the rest are boosting as they go. Which is the point of gaming settings, as the system considers them light threaded applications.
Click to expand...

Awesome, appreciate it!
 
Minstadave said:
Awesome, appreciate it!
Click to expand...

Welcome :D

By the way. If you run CB20 on single core, don't worry yourself why the load bounces between your 2 strongest cores and their threads. In my case these are CCD0 4 & 5 cores, where the load is moving around their 4 threads. The final number is 522 single core perf which can go 530 if you turn off SMT.
 
Last edited:
I haven't turned off SMT, CPUs all at stock just RAM OC, all 3x R9 3900X hit ~530 points for CB20 single. Thanks for info though :) .

Recently moved a R9 3900X to closed case.

Cooling is:-

Bykski A-Ryzen-ThV2-X (TIM AS5)
EK D5 PWM
2x Magicool G2 Slim 360mm
6x Arctic Cooling F12 PWM
1x Be Quiet Silent Wings 3 140m 1K RPM

Also changed the PCI-E slot to 4x/4x to use 2x Adata SX8200 Pro 1TB NVMe on an ASUS Hyper M.2 x16 Card, 1x Intel 660P 1TB NVMe on mobo slot, Kahru RAM Test ~3000% run WMV for 4x8GB 3733MHz using SOC: 1.025V, CLDO_VDDP: 0.901V, CLDO_VDDG: 0.951V, VDIMM: 1.35V, VTTDDR: 0.675V.
 
Just a couple of questions

1. Which CPU Core Voltage to be concerned about
I have my BIOS set to 'Auto' for core voltage with a load line calibration of '4'
Using HWInfo:
I have the "Asus WMI" report "CPU Core Voltage" of 1.325 @ idle and 1.375v under load
But under "CPU" reports "CPU Core Voltage (SV12 TFN) of 1.300 @ idle and 1.281v under load
Individual Core VID's under load are 1.038v

I wanted to keep the CPU voltage to < 1.3v for longevity, but not sure which CPU Core Voltage is important, my gut says the Asus one is irrelevant as that is only what it supplies the socket and the CPU reported one is probably the one you want kept low?

2. PBO on my Asus X470 Prime Pro
If I just use Ryzen Master to enable PBO from Stock BIOS settings, I get single cores nearly hitting 4.6Ghz, but all core clocks around 4.075Ghz under load, the PPT is always maxed out at 142W, which I suspect is the limiting factor.
So I pop in the BIOS and as mentioend a few posts above, I can increase PPT to 999 (then shows as 342w in Ryzen Master).
I've tried disabling PBO as mentioned (under Advanced\AMD Overclocking\Accept\Precision Boost Overdrive \Set Precision Boost Overdrive - Disabled) and enabling it
Whatever I try, any change in BIOS settings has my all core PBO drop to 3.85Ghz!

I think the ASUS bios is just broken at this point (it's their latest release) but anyone have any suggestions?
 
Demon said:
Just a couple of questions

1. Which CPU Core Voltage to be concerned about
I have my BIOS set to 'Auto' for core voltage with a load line calibration of '4'
Using HWInfo:
I have the "Asus WMI" report "CPU Core Voltage" of 1.325 @ idle and 1.375v under load
But under "CPU" reports "CPU Core Voltage (SV12 TFN) of 1.300 @ idle and 1.281v under load
Individual Core VID's under load are 1.038v

I wanted to keep the CPU voltage to < 1.3v for longevity, but not sure which CPU Core Voltage is important, my gut says the Asus one is irrelevant as that is only what it supplies the socket and the CPU reported one is probably the one you want kept low?

2. PBO on my Asus X470 Prime Pro
If I just use Ryzen Master to enable PBO from Stock BIOS settings, I get single cores nearly hitting 4.6Ghz, but all core clocks around 4.075Ghz under load, the PPT is always maxed out at 142W, which I suspect is the limiting factor.
So I pop in the BIOS and as mentioend a few posts above, I can increase PPT to 999 (then shows as 342w in Ryzen Master).
I've tried disabling PBO as mentioned (under Advanced\AMD Overclocking\Accept\Precision Boost Overdrive \Set Precision Boost Overdrive - Disabled) and enabling it
Whatever I try, any change in BIOS settings has my all core PBO drop to 3.85Ghz!

I think the ASUS bios is just broken at this point (it's their latest release) but anyone have any suggestions?
Click to expand...

I have the "Asus WMI" report "CPU Core Voltage" of 1.325 @ idle and 1.375v under load
I think you have these 2 the wrong way around, if so, those look perfectly fine, myself I use CPU-z and it reports pretty much the same results that you are getting, 1.3875v set in the bios on an MSI X570 Ace, with LLC set to level 4, under load gives me 1.328v, and idle and light workloads between 1.36v and 1.3875v.

I dont really trust motherboard software, they have been known to tamper with it to make things look better than they really are, I think it was ASUS recently that was doing it with their MOSFET temps on X570.
 
Jamin280672 said:
I have the "Asus WMI" report "CPU Core Voltage" of 1.325 @ idle and 1.375v under load
I think you have these 2 the wrong way around, if so, those look perfectly fine, myself I use CPU-z and it reports pretty much the same results that you are getting, 1.3875v set in the bios on an MSI X570 Ace, with LLC set to level 4, under load gives me 1.328v, and idle and light workloads between 1.36v and 1.3875v.

I dont really trust motherboard software, they have been known to tamper with it to make things look better than they really are, I think it was ASUS recently that was doing it with their MOSFET temps on X570.
Click to expand...

I've just double checked and they numbers are the right way around,

IDLE
ASUS WMI - CPU Core Voltage - 1.286v - 1.308v fluctuating
[CPU #0] - CPU Core Voltage (SV12 TFN) - 1.300v rock solid

LOAD (CB20 RUN)
ASUS WMI - CPU Core Voltage - 1.373v
[CPU #0] - CPU Core Voltage (SV12 TFN) -1.281v

So under load, the 3900x reported SV12 TFN CPU Core Voltage goes down, but the reported motherboard voltage goes up.

If I manually set 1.325v in the BIOS, then the 3900x reported CPU Core Voltage is 1.325v @ idle and drops to 1.281v under load, but the Asus reported voltage is 1.330v @ idle and still goes up underload.

I'm just going to leave it in Auto, the 3900x reported values look fine and only under severe 100% all core loads does the ASUS reported value increase, and I don't benchmark all the time, it's mainly used for video/photo editing so short bursts of load.
 
Pretty much any reputable review shows that all core overclocking a 3900X for gaming is pointless. The all core boost you get in a manual OC is less than you get from letting the CPU boost cores as required.

My testing during gaming shows any lightly threaded games will show 2 cores will boost to around 4.45 - 4.5GHz. All core OC comes in a few hundred MHz less.

Best results are to be gained from tweaking your RAM.
 
For sure.. managed to get about 20-25% better CPU benchmark scores in game related benches (eg 3d mark) by changing from the standard ram profile to 3600 CL14

Important your cooling is maxed out though, I'm just using the stock cooler while I wait to build a custom loop. I actually saw a very small drop in performance going from 3600 C16 to C14 during my fiddling which initially I thought was due to pushing the ram too hard and getting some errors that weren't enough to crash but enough to reduce perf. Doesn't appear to be the case though and what was actually happening was that with the higher voltage at CL14 was causing the CPU to throttle more, so when comparing average core frequency it was a little lower than with the looser but lower volted ram.

I think the extent of my overclocking for this chip will be slapping it under water, enabling PBO and running the ram maxed out!
 
Last edited:
Panos said:
Advanced\AMD CBS\NBIO Common Options\XFR Enhancement\Accepted

Set Precision Boost Override Manual
PPT Limit 999
TDC Limit 999
EDC Limit 999
Overdrive Scalar - Manual
customized - 5x

However make sure the actual PBO is OFF that's under
Advanced\AMD Overclocking\Accept\Precision Boost Overdrive
Set Precision Boost Overdrive - Disabled

Wording might seem weird, especially why we are turning on boost under the XFR settings but disabling it on the actual PBO settings. But works like a charm with the 1usmus powerplan :)

And that because I am trying to push the system to it's limits because X4 is hammering hard 2 cores (constant 100% load) and lightly 4-8 cores (60-80% load) depending the area we are in.
eg quiet areas is pretty low, on battlefield areas where there are dozens of ships per side it cranks the core usage up.

So with the above settings I get a 4600 & 4650 2 core 100% hammering for hours, while the rest are boosting as they go. Which is the point of gaming settings, as the system considers them light threaded applications.
Click to expand...

I've tried hard to get these settings to work and they're worse than stock for me.

With the settings what PPT/TDC/EDC limits does Ryzen master show you? Mine are stock 142W/95A/140A.
 
Has anyone here tried these pads instead of paste? Any good?

https://www.overclockers.co.uk/thermal-grizzly-carbonaut-thermal-pad-38-38-0.2-mm-th-02g-tg.html

On another point, I just took the following screenshot and noticed that the memory latency readings were lower when I cleared CMOS.
I cleared it not due to instability but because having ultra-fast boot enabled (I think it's called) never gave me enough time to enter the BIOS. :D
Anyway, back on topic. When I had my memory set to 1800Mhz instead of the stock 1200, the numbers highlighted below seemed much higher (like 26 vs 16).

MtWeqrJ.png
 
What you said,your running 32gb of ram at 2400mhz with cas 16 timings and you changed it to 3600mhz and timings were cas 26? The mb will alter timings to suit the ram speed/quantity and whats stable,its up to you to try and lower the 26.26.26 to the lowest stable,while upping dram voltage the the minimum thats stable aswell

Theres a dram calculator that helps you from what ive read
 
wazza300 said:
What you said,your running 32gb of ram at 2400mhz with cas 16 timings and you changed it to 3600mhz and timings were cas 26? The mb will alter timings to suit the ram speed/quantity and whats stable,its up to you to try and lower the 26.26.26 to the lowest stable,while upping dram voltage the the minimum thats stable aswell

Theres a dram calculator that helps you from what ive read
Click to expand...

Yeah, thanks, I'm aware of the calculator. I have already used it once though I need to re-enter the numbers again. :)

nhseNbM.png
 
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