Lowering idle power on Zen 4?

[AleXXX666]

For example, my 7800X3D runs at 85-86 °C when I'm crunching with BOINC with 4800 MHz RAM and 1 VSOC at a constant 4.8 GHz core speed. If I enable EXPO at 6000 MHz, VSOC jumps to 1.3 (I could manually lower it to 1.2 with not much difference in power used), which also means the CPU reaches its 89 °C limit under load and lowers core clocks. I'd much rather have higher and stable core clocks and lower temperatures than a higher memory clock that I don't feel literally anywhere.

Well, I think RAM bandwidth is still important, so in your case you could use 5200/5600 JEDEC RAM which is 1.1V also, though (oh, no, big timings - IDC, literally, lol)

 

[Palladium]

My 9800X3D is 15W total package idling with VSoC 1.08V and VDDIO 1.1V, RAM 6000CL30 at 1.35V.

CPU is negative 30 CO all core with -0.1V VCore offset.

Idle wattage is same as my 5600 non-X that is only running VSoC @ 0.8V. Enabling ASPM on my 5600 shaves of 2-3W in SoC draw too.

I think can push the X3D VSoC even lower, when I'm bored.

 

[rubiconlexicon]

My 9800X3D is 15W total package idling with VSoC 1.08V and VDDIO 1.1V, RAM 6000CL30 at 1.35V.

CPU is negative 30 CO all core with -0.1V VCore offset.

Idle wattage is same as my 5600 non-X that is only running VSoC @ 0.8V. Enabling ASPM on my 5600 shaves of 2-3W in SoC draw too.

I think can push the X3D VSoC even lower, when I'm bored.

15W is quite amazing for Zen. I had heard from base Zen 5 users (9700X and such) that idle power was hardly changed from Zen 3/4, and remained around the 30W range. Does your 9800X3D idle at around 15W even on stock settings or did it require the curve optimiser and VSOC changes to reach that level?

 

[Palladium]

15W is quite amazing for Zen. I had heard from base Zen 5 users (9700X and such) that idle power was hardly changed from Zen 3/4, and remained around the 30W range. Does your 9800X3D idle at around 15W even on stock settings or did it require the curve optimiser and VSOC changes to reach that level?

Stock was around 25W idle without EXPO or voltage lowering.

 

[AusWolf]

Well, I think RAM bandwidth is still important, so in your case you could use 5200/5600 JEDEC RAM which is 1.1V also, though (oh, no, big timings - IDC, literally, lol)

Nah, I'm good. I don't feel any difference in performance anyway. I could probably detect it in certain edge cases with benchmark tools, but I don't care.

 

[AleXXX666]

Nah, I'm good. I don't feel any difference in performance anyway. I could probably detect it in certain edge cases with benchmark tools, but I don't care.

thanks for the input/feedback, as 4800 is MUCH cheaper than ALL higher freq LMFAO, and if the diff is only for AIDA64 game or some "serious" work, then, who cares?

 

[AusWolf]

thanks for the input/feedback, as 4800 is MUCH cheaper than ALL higher freq LMFAO, and if the diff is only for AIDA64 game or some "serious" work, then, who cares?

Keep in mind that this is MY opinion. What others say may differ. I'm not exactly a frame rate chaser, if I get anywhere north of 50-60, I'm fine. I can't be asked to put up with more heat and power for a few percent.

 

[Waldorf]

but once you have more than 6C, i dont see it making sense to spend money on a big cpu, and then "restrict" bus bandwidth.
or the other way: what pc usage doesnt need IF/Bus.

and a 64GB kit with 4800-5200CL36-38 cost the same or more, than 6000CL30..

 

[AleXXX666]

Keep in mind that this is MY opinion. What others say may differ. I'm not exactly a frame rate chaser, if I get anywhere north of 50-60, I'm fine. I can't be asked to put up with more heat and power for a few percent.

ooh, I loove POWER lmfao, only high-volume gasoline, and lots of kw gpu (though, at a price. I'm not fan of overprice products like **90 series lol)

but once you have more than 6C, i dont see it making sense to spend money on a big cpu, and then "restrict" bus bandwidth.
or the other way: what pc usage doesnt need IF/Bus.

and a 64GB kit with 4800-5200CL36-38 cost the same or more, than 6000CL30..

yeah I duno, but check the info above - 6000 CL 30 will eat more volts itself then SOC will eat more too - that was the question haha

 

[londiste]

thanks for the input/feedback, as 4800 is MUCH cheaper than ALL higher freq LMFAO, and if the diff is only for AIDA64 game or some "serious" work, then, who cares?

I know this will feel like nagging but it is not meant as such - What do you use a computer for if not for testing, gaming or serious work? A simple internet box?

 

[Athlonite]

For example, running 4800 instead of 6000 MHz RAM and 1 VSOC instead of 1.3 on my 7800X3D lowers idle power from 30 to 17-18 W. Sure, it doesn't explain where that 18 W comes from, but still...

90~95% comes from the IO chip which runs at 100% all the time

 

[Waldorf]

@AleXXX666
i can still run lower settings, if wanted..

 

[Zach_01]

Just strike me right now…

There is a power setting (deep into settings) on my AM4 board related to lnfinityFabric

DF C-States (Enabled/Disabled or Auto/Disabled)
(DF as DataFabric)

If enabled theoretically it will turn down IF clock when the interconnection is not used or it’s in low utility. Just like CPU frequency is dynamic.

I also think that the “Uncore/SoC OC mode” must be disabled.

It was recommended back in Zen2 launch for stability to keep DF C-states disabled for those who want IF overclocking.

May worth to give it a try for those who want to explore low idle power further and don’t have concerns about OC.