9800X3D, great OC potential, what to do next?

jayecin · Mar 19, 2025

I have a 9800X3D with an MSI MAG x870e and 32GB GSkill Trident Hynix 6000-CL28 A Die, Arctic Freezer III 360MM with TPM7950. I followed the per core undervolt guide and set my FCLK to 2200, Ram to 6200 and bumped the voltage to 1.42, what should I do next? I havent touched the RAM timings yet, but im not really sure how to improve them. Should I try to go higher FCLK than 2200? Any guides on how to stabilize FCLK?

CO adjusted values

Core	Clock	Effective Clock	SVI3	PBO
Core0	5425	5468	1.181	-20
Core1	5425	5464	1.18	-27
Core2	5425	5468	1.188	-25
Core3	5425	5466	1.181	-25
Core4	5425	5468	1.18	-19
Core5	5425	5467	1.18	-25
Core6	5425	5467	1.192	-30
Core7	5425	5465	1.19	-29

Screenshot Font Software Video Game Software Diagram

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gupsterg · Mar 19, 2025

I have a 9800X3D that does FCLK 2233MHz, most things it's fine. But will shows issues in heavy CPU only tests. Bumping VDDG CCD & IOD may help, some CPUs it doesn't. Setting FCLK VDCI Mode Predicative may help, some CPUs it doesn't.

kovyrshin · Mar 19, 2025

There's a good chance you can run same timings at 6400 with higher voltage. After that, you can try higher BCLK/ECLK - CPU will boost past 5.5.
I would try higher FCLK 2233, but you might spend week working on it and got nothing in the end.

jayecin · Mar 19, 2025

I dont think I can do ECLK, i think only the MSI GODLIKE series has that and aint no way im spending that much on a motherboard for an extra 100-200mhz. With the ram is was at 6000CL28, i set it to 6200CL28 using all the same EXPO timings and I was getting errors, I bumped the voltage from 1.4 to 1.42 and the errors went away. You think I could just set to 6400 with like 1.45 volts? In terms of mclck, uclck and FCLK, is my understanding right that I want to run mclock and uclock 1:1 and FCLK just as high as I can run it? FCLK doesnt need to relate to either of the other clocks for best performance right?

kovyrshin · Mar 19, 2025

Generally, yes, FCLK as high as possible, and then bump MCLK/UCLK. There's discussion about having UCLK:FCLK as 3:2 (so 6400(3200):2133) but I found no difference in performance and staying at 2200.

You can try more than 1.45 voltage at 6400. Check AM5 stability thread for 6400C28 timings/voltages.

Also, next logical step (6200 or 6400) is running GDM off and/or lowering tRFC.

Imprezzion · Mar 23, 2025

Meh, just add some BCLK as high as it'll go before the GPU fails to initialize on cold boot and adjust PBO boost override accordingly.

101.4 would give you 5500 on the CPU and 6287 on the RAM which should be fine. FCLK set to 2167 would be 2197 so.

102.3 (if GPU still initializes properly this high) is 5550 CPU, 6342 RAM and either 2216 FCLK (if that works) or 2182 one step lower.

And also as said above GDM Disabled is the most important performance boost left right now. And maybe ArRdPtrInitValue to 1 or 0 to push the tPHYRDL into a match a set lower. With 0 I can match 33/33 at 6400C26 GDM Disabled on mine.

ZOONAMI · Mar 23, 2025

Is there any reason to set fclk higher than 2000 if running 6000 cl30 ram?

Imprezzion · Mar 23, 2025

ZOONAMI said:
Is there any reason to set fclk higher than 2000 if running 6000 cl30 ram?

Of course there is. At 6000/2000 you're heavily bandwidth limited by FCLK and any latency penalty from unsynced is cancelled by the speed. 2133 would match and above is faster.

ZOONAMI · Mar 24, 2025

Imprezzion said:
Of course there is. At 6000/2000 you're heavily bandwidth limited by FCLK and any latency penalty from unsynced is cancelled by the speed. 2133 would match and above is faster.

So 2200 if it runs fine is better than 2133?

ZOONAMI · Mar 24, 2025

Welp, doesn't post at 2133. Think I'll just leave it at 2000. 6000 ram with PBO and 200 offset gets me 16500 timespy CPU and much less headache vs fiddling with stuff, so I think I'm good lol.

ZOONAMI · Mar 24, 2025

Display device Electronic device Technology Computer Gadget

This is just PBO -30, +200 offset, 6000 expo cl30 with aggressive timings. 2000/default fclk. Don't see the reason to **** around with fclk when it doesn't post.

Taraquin · Mar 24, 2025

jayecin said:
I have a 9800X3D with an MSI MAG x870e and 32GB GSkill Trident Hynix 6000-CL28 A Die, Arctic Freezer III 360MM with TPM7950. I followed the per core undervolt guide and set my FCLK to 2200, Ram to 6200 and bumped the voltage to 1.42, what should I do next? I havent touched the RAM timings yet, but im not really sure how to improve them. Should I try to go higher FCLK than 2200? Any guides on how to stabilize FCLK?

CO adjusted values

Core Clock Effective Clock SVI3 PBO
Core0 5425 5468 1.181 -20
Core1 5425 5464 1.18 -27
Core2 5425 5468 1.188 -25
Core3 5425 5466 1.181 -25
Core4 5425 5468 1.18 -19
Core5 5425 5467 1.18 -25
Core6 5425 5467 1.192 -30
Core7 5425 5465 1.19 -29

View attachment 2703372 View attachment 2703374
View attachment 2703373

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Timings: Ras 64, rc 100, Rrdl 12, rfc 372, wr 48, rtp 12, scls 8, refi 65535 if you have airflow to ram.

Imprezzion · Mar 24, 2025

ZOONAMI said:
Welp, doesn't post at 2133. Think I'll just leave it at 2000. 6000 ram with PBO and 200 offset gets me 16500 timespy CPU and much less headache vs fiddling with stuff, so I think I'm good lol.

It probably won't POST because of the way too high vSOC. FCLK wants low vSOC when not pushing UCLK above 3000. Try 2133 or even 2200 FCLK with 1.05 vSOC, 1.30 VDDIO and 1.00 or 1.05 VDDP.

High vSOC is only needed for 6200+ in 1:1 mode. For example in 2:1 mode vSOC is irrelevant for memory clock speeds due to UCLK being 4:1. It only needs what it needs for FCLK.

gupsterg · Mar 24, 2025

jayecin said:
I dont think I can do ECLK, i think only the MSI GODLIKE series has that and aint no way im spending that much on a motherboard for an extra 100-200mhz.

I don't think you need to spend price tag of Godlike for eCLK. May not be worthwhile spend to change boards though.

I went open box X670E Hero with 12mths warranty to have a board with eCLK. Price at purchase time Nov 24, was very keen.

Prices of board have been rising since 300 series, one reason I never moved to AM5 until found a board cheap. My TUF X670E WiFi was again open box, cost what a B350 cost back in 2017.

ZOONAMI · Mar 25, 2025

Imprezzion said:
It probably won't POST because of the way too high vSOC. FCLK wants low vSOC when not pushing UCLK above 3000. Try 2133 or even 2200 FCLK with 1.05 vSOC, 1.30 VDDIO and 1.00 or 1.05 VDDP.

High vSOC is only needed for 6200+ in 1:1 mode. For example in 2:1 mode vSOC is irrelevant for memory clock speeds due to UCLK being 4:1. It only needs what it needs for FCLK.

Thanks for this. I was able to get 2133 working but I actually lost like 300 points in 3dmark timespy CPU score. Should I go back to 2000? I am guessing 1.2 soc voltage overall results in better performance than lower voltage to achieve an fclk overclock.

Fwiw I scored 17100 with cl30 6000 tight timings and 1.2 soc voltage and 16800 with 2133 fclk. I guess could just be run to run variance.

Imprezzion · Mar 25, 2025

ZOONAMI said:
Thanks for this. I was able to get 2133 working but I actually lost like 300 points in 3dmark timespy CPU score. Should I go back to 2000? I am guessing 1.2 soc voltage overall results in better performance than lower voltage to achieve an fclk overclock.

Fwiw I scored 17100 with cl30 6000 tight timings and 1.2 soc voltage and 16800 with 2133 fclk. I guess could just be run to run variance.

Personally I don't use 3dmark for CPU testing. Only cinebench / Y-Cruncher.

Lower vSOC allows for more power budget for the PBO OC so it reduces throttling slightly and allows for higher boost at higher loads as well.

ZOONAMI · Mar 25, 2025

Imprezzion said:
Personally I don't use 3dmark for CPU testing. Only cinebench / Y-Cruncher.

Lower vSOC allows for more power budget for the PBO OC so it reduces throttling slightly and allows for higher boost at higher loads as well.

It's a gaming build/I only really care about gaming so timespy CPU score seems relevant.

Maybe I'll do some cinebench comparisons though. I'm not sure if I want to push 2200 fclk as from internet chatter that rarely ever actually is stable.

Imprezzion · Mar 25, 2025

ZOONAMI said:
It's a gaming build/I only really care about gaming so timespy CPU score seems relevant.

Maybe I'll do some cinebench comparisons though. I'm not sure if I want to push 2200 fclk as from internet chatter that rarely ever actually is stable.

Mine is lol. And it's not exactly a specially good sample. 2200 FCLK @ 1.015 vSOC with 8000C34 memory. Or 2200 @ 1.235 vSOC with 6400C26. Both fully stable. Cores at 5500 all core with a bit of eCLK
As a comparison, that's around 24400 in Cinebench R23.

ZOONAMI · Mar 25, 2025

Imprezzion said:
Mine is lol. And it's not exactly a specially good sample. 2200 FCLK @ 1.015 vSOC with 8000C34 memory. Or 2200 @ 1.235 vSOC with 6400C26. Both fully stable. Cores at 5500 all core with a bit of eCLK
As a comparison, that's around 24400 in Cinebench R23.

Isn't it weird you can post with that high of voltage for the 6400 set up with 2200 fclk?

Imprezzion · Mar 25, 2025

ZOONAMI said:
Isn't it weird you can post with that high of voltage for the 6400 set up with 2200 fclk?

It's the absolute max for my chip. 1.245 makes FCLK 2200 unstable. I'm lucky I can run both 2200 FCLK and 6400 memory at 1.235v. Some can do 6600/2200 at 1.30 but that's very rare.

9800X3D, great OC potential, what to do next?

jayecin

gupsterg

kovyrshin

jayecin

kovyrshin

Imprezzion

ZOONAMI

Imprezzion

ZOONAMI

ZOONAMI

ZOONAMI

Taraquin

Imprezzion

gupsterg

ZOONAMI

Imprezzion

ZOONAMI

Imprezzion

ZOONAMI

Imprezzion

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