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UPDATE: 2000 FCLK works !!? Is my 5950x a dud ?- wont do 1900Mhz FCLK no matter what

Cavokk

Cavokk

Cavokk

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Joined
1 Dec 2020
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18
UPDATE: It must be BIOS related as I just tried for the heck of it in frustration selecting 2000 MHZ FCLK in BIOS - and BAM booted up just like normal (in fact typing this running 2000 MHZ FCLK) - Time to experiment - will keep you posted :D

C

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Hey forum.

Just checking if I am too picky here - I recently exchanged an interim 5800x with a 5950x. Problem is that whereas the 5800x easily moved along fine at 2000 Mhz FCLK with full autosettings in BIOS, my new 5950x struggles even doing 1866Mhz FCLK.. Its quite s shame as I have just installed my shiny new 32 GB G.Skill 3800CL14 Ram (4*8) to replace my old 3200CL15 which now goes back into my 8700K build.

My Specs are in in the signature and I am running the latest 3001 Bios with AGESA 1.1.8.0 just released for the 570 Asus boards. I am running with all bios setting on default but enabling DOCP simply refuses to post POST at all. Even adjusting vSOC,, CCD, IOD, VDDP according to various guides on the forum like this one:
8 PACK MEMORY RANGE GROWING: SAY HELLO TO 8 PACK RIPPED EDITION & 32GB KITS!!! makes absolutely no difference no matter how high I set the different voltages.

I even tried disabling one of the CCD´s but no change - still no posting at 1900 FCLK :(

Anyone have a tip on what else I could try as I am currently out of ideas on how to get 1900 Mhz FCLK working and thinking of RMA'ing it?

Thanks in advance

C
 
Last edited:
Should test FCLK separate from memory and memory separate from FCLK to confirm which is acting up
1. keep memory at default 2133, raising fclk step by step and keeping voltages on auto or moderately increased. In realm of vsoc, vddg etc too much voltage doesn't help.
2. keep fclk at 1600 and try memory at xmp 3800. If that doesn't work, keep XMP but manually lower memory speed.
3. Its possible that XMP timings don't work, set some 16-16-16 rest on auto.
 
Cavokk said:
Hey forum.

Just checking if I am too picky here - I recently exchanged an interim 5800x with a 5950x. Problem is that whereas the 5800x easily moved along fine at 2000 Mhz FCLK with full autosettings in BIOS, my new 5950x struggles even doing 1866Mhz FCLK.. Its quite s shame as I have just installed my shiny new 32 GB G.Skill 3800CL14 Ram (4*8) to replace my old 3200CL15 which now goes back into my 8700K build.

My Specs are in in the signature and I am running the latest 3001 Bios with AGESA 1.1.8.0 just released for the 570 Asus boards. I am running with all bios setting on default but enabling DOCP simply refuses to post POST at all. Even adjusting vSOC,, CCD, IOD, VDDP according to various guides on the forum like this one:
8 PACK MEMORY RANGE GROWING: SAY HELLO TO 8 PACK RIPPED EDITION & 32GB KITS!!! makes absolutely no difference no matter how high I set the different voltages.

I even tried disabling one of the CCD´s but no change - still no posting at 1900 FCLK :(

Anyone have a tip on what else I could try as I am currently out of ideas on how to get 1900 Mhz FCLK working and thinking of RMA'ing it?

Thanks in advance

C
Click to expand...

I had the same problem

Check out the thread. Im running 1900 now no problem

G.skill Trident Neo 3800 CL14 issues | Overclockers UK Forums

One key factor for me though, was I think i tightened the waterblock too tight. Loosening it gave it more stability,
 
I was always under the impressing that 3600 was the Zen 3 sweet spot making FCLK likely best at 1800. Anything above that is down the silicon lottery, but I have a feeling it’s diminishing returns at that point and the extra power needed probably is not worth it. We are literally talking 1FPS type territory anyhow.
 
benjii said:
Those of you with a 1900 FLCK have you checked for WHEA errors?
Click to expand...

I think this is a good question, as I can't imagine a 1900 without really pushing up voltages, especially with the previous BIOS where basically these 5000 series chips were pretty unstable.

With the above in mind, what sort of voltage changes are people making to get to even 1800 on these beasts? I'm still sitting at base as I want to make sure my machine is totally stable now I have the new BIOS. The new BIOS alone has allowed me to enable XMP/DOCP as well as PBO, something not possible before. Mind you, before I was hardly able to run the machine even in default mode with patch C (was better in patch B). I might be prepared to do a little basic overclocking in a few days time once I feel comfortable that things are looking good. CB23 scores at the moment with PBO enabled get me over 27K (and around 24K without) which is pretty incredible as it is).
 
Daylight_Invader said:
I think this is a good question, as I can't imagine a 1900 without really pushing up voltages, especially with the previous BIOS where basically these 5000 series chips were pretty unstable.

With the above in mind, what sort of voltage changes are people making to get to even 1800 on these beasts? I'm still sitting at base as I want to make sure my machine is totally stable now I have the new BIOS. The new BIOS alone has allowed me to enable XMP/DOCP as well as PBO, something not possible before. Mind you, before I was hardly able to run the machine even in default mode with patch C (was better in patch B). I might be prepared to do a little basic overclocking in a few days time once I feel comfortable that things are looking good. CB23 scores at the moment with PBO enabled get me over 27K (and around 24K without) which is pretty incredible as it is).
Click to expand...

I've only had my 5900X a few days and I've been pretty busy, so not done too much overclocking. I managed 1900 FLCK with 3800Mhz RAM at 1.4v. I ran a mem test for an hour and it was fine, however, in that time it racked up 4000 WHEA errors. Including a bunch of CPU/BUS related ones, indicating the FLCK OC is not stable.

I need to just have a good sit down with it and test further. This is just my initial findings.
 
alec said:
Should test FCLK separate from memory and memory separate from FCLK to confirm which is acting up
1. keep memory at default 2133, raising fclk step by step and keeping voltages on auto or moderately increased. In realm of vsoc, vddg etc too much voltage doesn't help.
2. keep fclk at 1600 and try memory at xmp 3800. If that doesn't work, keep XMP but manually lower memory speed.
3. Its possible that XMP timings don't work, set some 16-16-16 rest on auto.
Click to expand...

Thanks Alec - yes I have tried setting 2133 standard Jedec timings to keep the memory it self out of the loop and that made no difference at all :( Its like there is a hard wall at 1866 ..

Cheers

C
 
I think you need to do more than just up the RAM voltage for a 1900 FCLK. I would be looking to update the die voltages to counter that sort of increase, but I think the power consumption increases and possible other issues might not be worth pushing the chip to those levels.

AMD still recommends just sticking to 1600 and obviously this pairs with low latency 3200 RAM. Behind the scenes they have stated 1800 as being some sort of sweet spot, suggesting this pairs best with 3600 RAM. The overclocking community seem to be able to push 2000 out of these puppies, but again you are going to be pushing the voltages to do that, which increases heat and therefore cooling requirements. At this point though you really are in the land of diminishing returns, and I doubt you will be able to push much more out of what you might get at 1800. There is also a point where you are probably better moving to a processor with quad channel ram +, and that means looking at TR and EPYC processors.
 
WHEA errors are most probably BIOS related. i had loads on 1 bios. none on an earlier one and none on this one. but the one in the middle had tons of them. exact same settings... all stable in all tests no mem errors etc...

Seee what other BIOS are available
 
try VDDG IOD and CCD at 1050mv, somewhere between 1.08 and 1.1v SOC. 1.45v DRAM if its BDIE.

Up your ProcODT to something like 48 or 1step higher
Gear down mode on
 
Cavokk - Out of interest, with defaults, what boosts are you seeing when enabling PBO (or even without)? I've seen over 5Ghz with at least two cores across both CCDs in my case suggesting I probably have some half decent silicon. In fact I think I might have seen 5.1 at some point the other day, but I want to see that again before saying that definitely happened. :)
 
Daylight_Invader said:
Cavokk - Out of interest, with defaults, what boosts are you seeing when enabling PBO (or even without)? I've seen over 5Ghz with at least two cores across both CCDs in my case suggesting I probably have some half decent silicon. In fact I think I might have seen 5.1 at some point the other day, but I want to see that again before saying that definitely happened. :)
Click to expand...

I am not overclocking or using PBO but I see 3 cores boosting to 5050, a couple at 5000, the rest between 4950-4975.

In benchmarks I get :

650 in R20 single, 10204 R20 multi,
1750 Geekbench 5 Single, 17144 Multi,
698 CPU-Z single and 12108 on multi

All in a 25 Celcius room at 3600Cl14, 1800 FCLK

C
 
UK_SPAWN said:
try VDDG IOD and CCD at 1050mv, somewhere between 1.08 and 1.1v SOC. 1.45v DRAM if its BDIE.

Up your ProcODT to something like 48 or 1step higher
Gear down mode on
Click to expand...

Thanks UK_Spawn - actually those voltages is what I now can run 1866 FCLK stable at :D - endless boot cycling between 3 q-codes when trying 1900 no matter the RAM speed setting - have to reset CMOS to get up and running again :/

C
 
I had one bios on my gigabyte x570 xtreme that would let me post and boot and run stress tests at 4000/2000 (f31l) i though it was stable infact until i started looking at the event viewer, a lot of WHEA errors but no crashes. I had to go down to 3200/1600 to get rid of the WHEA errors, so i ended up downgrading the bios the the latest "non beta" and now i can at least run 3600/1800 stable but i can't seem to go to 1900, it won't even post, i haven't tried doing anything to the voltages, i'm not that good at this.

Regarding PBO, has anyone else noticed that with PBO enabled your single core boosts are a lot less often at 5050 ghz? If i enable it i rarely see more than 1 or two cores touch 5050 ghz if ever. with PBO disabled almost all cores goes to 5050 at one point or another.
 
Daylight_Invader said:
I think this is a good question, as I can't imagine a 1900 without really pushing up voltages, especially with the previous BIOS where basically these 5000 series chips were pretty unstable.

With the above in mind, what sort of voltage changes are people making to get to even 1800 on these beasts? I'm still sitting at base as I want to make sure my machine is totally stable now I have the new BIOS. The new BIOS alone has allowed me to enable XMP/DOCP as well as PBO, something not possible before. Mind you, before I was hardly able to run the machine even in default mode with patch C (was better in patch B). I might be prepared to do a little basic overclocking in a few days time once I feel comfortable that things are looking good. CB23 scores at the moment with PBO enabled get me over 27K (and around 24K without) which is pretty incredible as it is).
Click to expand...


I run 1900 on mine at stock voltage - no whea errors or anything.

My current bios is poor as well as it's not controlling core clock voltages very well but FCLK is absolutely fine at 1900.
 
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