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Discussion Starter · #1 · (Edited)
Good morning,

I have the following setup:

MB: MB ATX Asus ROG Crosshair VIII Hero (Wi-Fi)
PSU: ATX Asus ROG Strix 850W 80 Plus Gold Full Modular
CPU Cooler: iCUE H100i H115i H150i Elite Capellix
CPU: AMD Ryzen 9 5900x
Memory Bios OC: D.O.C.P.
Bios Version: Last stable version 4006
RAM Memory Kit: G.Skill Trident Z RGB DDR4-4800 CL20-30-30-50 1.55V 32GB (2x16GB) - F4-4800C20D-32GTZR - F4-4800C20D-32GTZR - G.SKILL International Enterprise Co., Ltd.

Is it possible to reach 4800mhz with my setup above? What should I change?

Mobo accept setup even higher than 4800mhz OC.

I tried the standard D.O.C.P. profile and my computer keeps rebooting reporting as unstable configuration.

Standard D.O.C.P profile:
Voltage: 1.55v (1.53v at bios read)
Frequency: 4800mhz
Latency: 20-30-30-50

I was able to reach 4400mhz with the same configuration above, but benchmark reported 1 memory error and then I came down to 4333mhz.

I am currently using:
Voltage: 1.55v (1.53v at bios read)
Memory Frequency: 4333mhz
BCLK Frequency: 100.0000
FCLK Frequency: Auto (2166mhz at benchmark read)
Latency: 18-27-27-47
PowerDown: Disabled
BGS: Disabled
BGS Alt: Enabled
GDM: Enabled
VSOC: Auto (1.11v at bios read)

Memories are at slot B2 (16GB) and A2 (16GB) as specified at motherboard manual.

Is there something else that I could do to reach the 4800mhz having my system stable? Or any other configuration to have a better OC setup even bellow the 4800mhz?

Thank you in advance.
 

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Discussion Starter · #3 · (Edited)
Are you sure your FCLK is 2166? In 1:1:1 mode? If so, it's excellent. I hear most Zen 3 CPUs top out around 1900.
Did you try to raise the vSOC a bit? Like 1.15.
I am not sure. My FCLK is set to auto, but the benchmark softwares says it is 2166 wich is pretty much half of my frequency 4333mHz. Have no clue hat is 1:1:1 mode. Sorry.

I didnt raise the vSOC because I tried to make some others changes and windows started to crash after a few minutes of use. I came back again with the last setup. I was able even to reach 4400 mHz but came down again to 4333 mHz which I made some tests and it is completly stable.

I did also send a message to G.Skills and someone replied saying that my memory is not fully compatible with my mobo and I might not be able to reach 4800 mHz at all.
 

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11900KF, Unify-X, 2x16 3733 13-15-15-30, 5700XT
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D.O.C.P. is just AMD's name for XMP. They are 2 different names for the same thing. Intel calls it XMP.

If your RAM says 4333 MHz, the actual memory clock is 2166 MHz. DDR memory transfers data twice per clock, so the effective speed is 4333, and everyone uses that number as frequency for the memory. Mine is at 3733 MHz effective speed, but the actual memory clock is 1866.
Very fast memory isn't very good for Ryzen, because you get the most performance when FCLK = memory clock. And the infinity fabric (FCLK) usually tops out around 1866 or 1900. That is why most people on Ryzen go for memory speeds like 3600, 3733 or 3800, and low timings.

What benchmark software are you using?
 

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I am not sure. My FCLK is set to auto, but the benchmark softwares says it is 2166 wich is pretty much half of my frequency 4333mHz. Have no clue hat is 1:1:1 mode. Sorry.

I didnt raise the vSOC because I tried to make some others changes and windows started to crash after a few minutes of use. I came back again with the last setup. I was able even to reach 4400 mHz but came down again to 4333 mHz which I made some tests and it is completly stable.

I did also send a message to G.Skills and someone replied saying that my memory is not fully compatible with my mobo and I might not be able to reach 4800 mHz at all. Well, I told them that my bios uses D.O.C.P. and tech guy keeps saying to setup the XMP. So, I dont know how smart is the person that replied to me. Maybe it is someone that only looks to a list of tested mobos and reply with a pattern emails. Who knows?
CPU internal memory controller quality is unknown so it is up to the user to test and see how high it can be pushed. You can tune the memory for Infinity Fabric ratio 1:1 DDR4-3600 (DRAM bus frequency/FCLK 1800MHz - average) to DDR4-4000 (DRAM bus frequency/FCLK 2000MHz - highest for Ryzen CPUs), or you can attempt highest DRAM Frequency without IF 1:1 and benchmark to see which way you like.
 

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Discussion Starter · #6 ·
D.O.C.P. is just AMD's name for XMP. They are 2 different names for the same thing. Intel calls it XMP.

If your RAM says 4333 MHz, the actual memory clock is 2166 MHz. DDR memory transfers data twice per clock, so the effective speed is 4333, and everyone uses that number as frequency for the memory. Mine is at 3733 MHz effective speed, but the actual memory clock is 1866.
Very fast memory isn't appropriate for Ryzen, because you get the most performance when FCLK = memory clock. And the infinity fabric (FCLK) usually tops out around 1866 or 1900. That is why most people on Ryzen go for memory speeds like 3600, 3733 or 3800, and low timings.

What benchmark software are you using?
I am using some softwares at moment. I am not sure what is a really benchmark but here it goes the list:
ZenTimings_v1.2.5
thphn167
DRAM-Calculator-for-Ryzen-1.7.3
thphn167
TestMem5 v0.12 (best configs)English
memtest
CPU-Z 2.01 ROG Edition
GPU-Z 2.46.0 ROG Edition
hwmonitor_1.45
 

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In CPU-Z, in the memory section, what is your NB frequency?
If it's 2166, sounds like you have an excellent CPU.

Try 1.15 vSOC, 4400 memory, 2200 FCLK, and loosen the memory timings by 1. See if it's stable in the stress test. This is to see how fast you can run the memory and keep the 1:1 ratio. You can tune it more later
 

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Discussion Starter · #8 ·
In CPU-Z, in the memory section, what is your NB frequency?
If it's 2166, sounds like you have an excellent CPU.

Try 1.15 vSOC, 4400 memory, 2200 FCLK, and loosen the memory timings by 1. See if it's stable in the stress test. This is to see how fast you can run the memory and keep the 1:1 ratio. You can tune it more later
Nope. The NB frequency is 1083.1 MHz. I am starting to think that I bought a very wrong memory.
 

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Well, this RAM is not optimal for Ryzen, but I don't think you'll notice except from benchmarks.

You can try how fast it'll go while keeping the 1:1 ratio. Around 3800 MHz usually, with appropriately low timings. Run a benchmark, I suggest a built-in benchmark from a game. I use Far Cry New Dawn and Shadow of the Tomb Raider. See which configuration is faster. This, or 4333 without 1:1 ratio. Like G.Skill Support said earlier.
 

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Discussion Starter · #10 ·
Well, this RAM is not optimal for Ryzen, but I don't think you'll notice except from benchmarks.

You can try how fast it'll go while keeping the 1:1 ratio. Around 3800 MHz usually, with appropriately low timings. Run a benchmark, I suggest a built-in benchmark from a game. I use Far Cry New Dawn and Shadow of the Tomb Raider. See which configuration is faster. This, or 4333 without 1:1 ratio. Like G.Skill Support said earlier.
What do you think it will be the best to try?
4000 mHz / 2000 FCLK / VSOC 1.15 / 18 27 27 27 47
3800 mHz / 1900 FCLK / VSOC 1.15 / 17 27 27 27 47 or even try 16 26 26 26 46

I will try to download those games. I usually play CSGO and Valorant, but I also use the computer for development and video making.
 

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Try the first (4000). If it doesn't work, try the next lower frequency (maybe 3933, I'm not sure what it is). If that doesn't work too, go one more step lower. Until it works and it's stable. You can lower the timings later, focus on the frequency for now.

Shadow of the Tomb Raider on Steam has a trial version that has the benchmark. Far Cry doesn't. It's just what I play, maybe the games you play have a built-in benchmark too.
 

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Discussion Starter · #12 ·
Try the first (4000). If it doesn't work, try the next lower frequency (maybe 3933, I'm not sure what it is). If that doesn't work too, go one more step lower. Until it works and it's stable. You can lower the timings later, focus on the frequency for now.

Shadow of the Tomb Raider on Steam has a trial version that has the benchmark. Far Cry doesn't. It's just what I play, maybe the games you play have a built-in benchmark too.
I just checked the Shadow of Tom Raider benchamark and looks like a lot Heaven Benchmark 4.0. I am also using Cinebench R23.

I will try what you've said, but I am still a little bit lost about if I should setup also FCLK to half of frequency, VSOC to 1.15 and timing. It is just my first time trying to handle this.
.
 

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Set FCLK manually to half the memory frequency. So, start with 4000 memory and 2000 FCLK, 1.15 vSOC, timings to 18-26-26-46, and memory voltage to 1.5v.
If it doesn't work, set the memory frequency and FCLK to one step lower, leave everything else the same, and try again.
If it boots, run some stress tests to see if it's stable.

Cinebench doesn't tell you much about the memory, it's mostly a CPU benchmark.
 

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Discussion Starter · #14 ·
Set FCLK manually to half the memory frequency. So, start with 4000 memory and 2000 FCLK, 1.15 vSOC, timings to 18-26-26-46, and memory voltage to 1.5v.
If it doesn't work, set the memory frequency and FCLK to one step lower, leave everything else the same, and try again.
If it boots, run some stress tests to see if it's stable.

Cinebench doesn't tell you much about the memory, it's mostly a CPU benchmark.
The way I see here Shadow of Tom Raider benchamark only show the fps. I will try the way you said.
 

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Discussion Starter · #16 · (Edited)
Did it work?
If it's stable at 4000/2000, try 4066/2033.
It worked at 4000/2000 but I am still doing some performance and stress tests. I was about to try 4066/2033 that yesterday. I will post the results later this week. What about trying to lower the timing in 1? What do you think? Maybe 18-25-25-45?

I will try to do both 4066/2033 and 18-25-25-45? If I have any memory error, is it better to rise the timing and keep frequency or lower the frequency and keep timing?

Thankx
 

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I would leave the timings and voltage alone for now, and see how high the FCLK will go. Maybe one extra step, to 4133/2066.
After you see where the FCLK tops out, then lower the timings.

It's worth it to drop the frequency by 66/33 MHz in order to lower the timings by one. But this is for later.

I'm not saying it's the right way, it's just how I would do it. I've never had a Ryzen system.
I've heard that if you have Gear Down Mode enabled, the timings have to be even numbers, so if you set 25 it'll change to 26 on its own. I'm not sure. Try 16-24-24-44.
 

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Discussion Starter · #18 ·
I would leave the timings and voltage alone for now, and see how high the FCLK will go. Maybe one extra step, to 4133/2066.
After you see where the FCLK tops out, then lower the timings.

It's worth it to drop the frequency by 66/33 MHz in order to lower the timings by one. But this is for later.

I'm not saying it's the right way, it's just how I would do it. I've never had a Ryzen system.
I've heard that if you have Gear Down Mode enabled, the timings have to be even numbers, so if you set 25 it'll change to 26 on its own. I'm not sure. Try 16-24-24-44.
Sounds good. I will move back the timing and try to raise the frequency again since this setup gave me 1 memory error while testing it. And you are right I tried to lower the timing to 17-25-25-45 and CPU-Z shows 18-25-25-45. I made some testes with this setup anyways. I am taking notes of all tested setup I've made so far and then I will post the results. Thank you again.
 

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Discussion Starter · #19 ·
Sounds good. I will move back the timing and try to raise the frequency again since this setup gave me 1 memory error while testing it. And you are right I tried to lower the timing to 17-25-25-45 and CPU-Z shows 18-25-25-45. I made some testes with this setup anyways. I am taking notes of all tested setup I've made so far and then I will post the results. Thank you again.
I tested the following with no success:
4133/2066 18-26-26-46 - had my windows rebooted twice.
4066/2033 16-24-24-44 - bios didn't started. I had to raise the timing.

Testing now:
4066/2033 18-24-24-44 - bios started and windows is working ok so far.

Let's stress it and see if it will be stable or rebooting and/or with memory error.
 

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Discussion Starter · #20 ·
Well, I made a stress test using MEMBench from DRAM-Calculator-for-Ryzen-1.7.3 which actually uses memtest program. Only let them run for 100% with all left memory tests and 24 threads. I had no errors so far. I will try to let them run for 400% with all left memory tests and 24 threads tomorrow and see if it keeps with no errors. And then I post all results that I've got so far.
 
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