Hi all, apologies if this has already been answered a million times, but I'm looking for advice on whether my planned PBO settings will be fine or if I should look to add/change anything. Another alternative is whether I should not even bother enabling PBO but from my understanding the below is actually safer.
My CPU & MOBO combo is a 9800X3D & Aorus B850 Elite WIFI7.
I'll be disabling fast boot and windows sleep mode as I've read these can cause issues.
For the PBO settings.
Enable PBO advanced option.
Set PBO limits to manual.
Set PPT limit at 115 W
Set TDC limit at 90 A
Set EDC limit at 105 A
Leave PBO scalar as auto
Change curve optimiser to all cores and set it at -10. If it's stable in Aida64 I'll try my luck with -15 and test it again.
I'm not looking to push the limits or get the maximum performance out of my CPU, I just want the CPU to be safe, not reach high temps, be stable and most importantly not fry itself.
I feel like BIOS updates have entirely solved the 9800x3d issues. With that being said the settings you're proposing are fine. -10 should be fine and stable.
Thanks for few more ideas. I at the moment have only set VSOC to 1.2V (with EXPO on) and curve optimizer to -20.
I'll try some of these.
My settings are pbo advanced, pbo limits set to motherboard, scalar auto, boost override +150, CO -20 all cores. Anything above 20 crashes Aida instantly. My temps in cpu intensive games are 64 at most usually more around 60. 85 when preloading shaders or whatever. Your 9800x3d has insane thermal head room. You dont have to push it to the max. I think my settings are modest. You can also set the chip to throttle at 85 so it will forever stay ten degrees under its thermal limit even if it were to start boosting all crazy. All that being said, find what works for you. But also these babies got all kinds of safety features to stop you from frying your chip either way.
Hey, thanks for the recommendations! I did read into setting the chip to throttle at 85, sounds like a good idea! Did you change any of the PPT, TDC or EDC values or have you only increased boost override by +150, done a -20 CO and set the throttle limit to 85•
Yeah I’ve only tinkered with pbo and co
Keep Vsoc and VDDIO as low as possible.
Do you think 1.25v for Vsoc is fine or should I try 1.2V to be safe? ill try 1.4v for vddio
1.4 is way higher than necessary, pretty sure I’m at 1.2V 6000/2200fclk. Vsoc as low as possible while achieving stability
Ok appreciate the advice, I'll give it a try
With running only 115 w tdp you should easily get -20 to -35 max curve optimizer
Yea I thought so too. My initial thought was to set it to -25 but ill start off lower and test it from there.
I have my tdp set to 160 something watts and thermal limit at 90c. Whenever I start game and it runs shaders the cpus pegged in 140s to 150 watts range and its cooking at 90c for few minutes at time. Its 65c to 70s in mid game. I think its overkill and not worth the high temps. Im gonna lower the tdp back to 120w. The gains from more power arnt even noticeable and Id rather have cooler running cpu again
The newer 9800X3Ds don't seem to stay stable with larger CO values. I don't know if the introduction of the 9950X3D or the upcoming 9850X3D are pulling better-binning CCDs out of the 9800 or what, but it is what I suspect. If OP just got his, I'd encourage him to heavily test for stability if trying to get to a higher CO value than -10.
I'm picking it up today and installing in a few days, just getting prepared in advance. Realistically I could probably get to -25 before I start running into stability issues so I can't foresee myself having issues at -10. Either way ill be running extensive tests to ensure my system is stable
The magnitude of CO a cpu is capable of doesn’t mean anything, what matters is how low the vcore can go and still be stable at given clock speeds. The V-F curve is unique for every core and cpu and the CO is relative to that unique curve.
To explain by example, each CO point is worth about 4mv. One 9800x3D set to +200 might ask for 1.35v stock and be stable with -30 all core CO and thus pull 1.23v vcore. Another 9800x3D set to +200 might ask for 1.23v stock and be stable with only -7 all core CO and thus pull 1.2v vcore. The second cpu is actually binned better despite taking less CO.
What matters is vcore. My 9800x3D has a ridiculous stable -40 to -50 per core CO but it’s actually binned ass because it asks for such massive voltage because one core is dogshit. The lowest vcore I can get stable at 5425mhz is 1.26v, there are bins that get that at 1.2v. At least my memory controller is pretty good, I can get 6400 cl28 stable on dual rank 64gb ram.
And this is precisely why people need to slowly ramp up the CO offset instead of just going with big numbers to start. This isn't the old days where a static vcore gets set.
You don't have an Asrock board and as long as the bios is from the past year then there's no risk