How to fine tune PBO

[WatEagle]

Hi all, I’m opening this thread to gain Knowledge on how PBO works.

Long story short, recently I built a rig for my friend and he as me has a r5 3600, the only different thing is the Mobo: mine is a b450 tomahawk max, he has a b450-f

i noticed that in the same game his CPU is constantly boosting between 4.1 GHz to 4.2, mainly staying at 4.150 or more
mine instead is always a bit lower in the clock, hanging at 4.075

he doesn’t use PBO but I use it: PPT 90W, TDC 60, EDC 70 as @Zach_01 suggested me when first I was trying to get more performance out of it

how can I get it to boost more often close to 4.2Ghz? Is it also possible to go over that limit tuning more PBO?

 

[Zach_01]

Your CPU is like mine, always around 4050~4100MHz (by avg) while gaming. There is really nothing you(we) can do about it. Its just worst binned.
1usmus's CTR has rated my CPU as "Bronze".

Fiddling with PBO makes minor difference. Currently have it PPT 95W, TDC 55A, EDC 65A and maybe boosts like +25MHz at best.
Just be happy with it and enjoy the gaming. 50 or 100Mhz makes maybe 1~2% difference at best in gaming performance...

 

[WatEagle]

Your CPU is like mine, always around 4050~4100MHz (by avg) while gaming. There is really nothing you(we) can do about it. Its just worst binned.
1usmus's CTR has rated my CPU as "Bronze".

Fiddling with PBO makes minor difference. Currently have it PPT 95W, TDC 55A, EDC 65A and maybe boosts like +25MHz at best.
Just be happy with it and enjoy the gaming. 50 or 100Mhz makes maybe 1~2% difference at best in gaming performance...

That's what I also thought. Setting edc to 7A was surely helping, almost capping it at 4200-4150 mhz in almost every situation in f1 2020
I also thought that it's a bit too much to boost like that with auto voltage so I got back to 70A

 

[Chrispy_]

Yeah, silicon lottery. All you can do is cool it hard and throw more power at it but IMO you're better off just accepting it for what it is an focusing your efforts elsewhere.

The MSI B450 boards I've used (Tomahawk, Mortar) did seem to throw an aggressive amount of power using PBO. It might be worth seeing if you get similar clocks using bone-stock AMD defaults as a PBO-override (88W/60A/90A). It'll probably run within 1% but much cooler and quieter, could even lead to longer durations at peak boost for heavier games than F1.

https://www.gamersnexus.net/guides/3491-explaining-precision-boost-overdrive-benchmarks-auto-oc is a good article if you want to read more about PBO, I don't think TPU has done one quite as in-depth.

 

[WatEagle]

Yeah, silicon lottery. All you can do is cool it hard and throw more power at it but IMO you're better off just accepting it for what it is an focusing your efforts elsewhere.

The MSI B450 boards I've used (Tomahawk, Mortar) did seem to throw an aggressive amount of power using PBO. It might be worth seeing if you get similar clocks using bone-stock AMD defaults as a PBO-override (88W/60A/90A). It'll probably run within 1% but much cooler and quieter, could even lead to longer durations at peak boost for heavier games than F1.

https://www.gamersnexus.net/guides/3491-explaining-precision-boost-overdrive-benchmarks-auto-oc is a good article if you want to read more about PBO, I don't think TPU has done one quite as in-depth.

at this point i'll leave as it is since I have no temperature problems
I trend also amd default for PBO but haven't seen any improvement

 

[EarthDog]

Can't really compare two different cpus/boards/cooling and call it apples to apples. Each board/bios is different from others. So is cooling the cpu and vrms as those are different too. Whats going on with the OS in the background is different as well. That said, the difference is 75MHz... negligible in the first place.

I also suggest you run stock and see what happens in your ecosystem to see if it's worth tweaking pbo.

 

[WatEagle]

Can't really compare two different cpus/boards/cooling and call it apples to apples. Each board/bios is different from others. So is cooling the cpu and vrms as those are different too. Whats going on with the OS in the background is different as well. That said, the difference is 75MHz... negligible in the first place.

I also suggest you run stock and see what happens in your ecosystem to see if it's worth tweaking pbo.

At first I didn't thought of that but then when I used 7A I could get better results than his and I think the only major factor is how mobo manages pbo

He doesn't use it but as I remember using ryzen master in his system pbo settings were cranked up like crazy, leaving all default into bios

 

[OneMoar]

I am only seeing all core boosts of about 4500 messed with negatives offsets and pbo power vars didn't seem todo much except make it blue screen when I pushed the boost override or offset too far