Ryzen 5800x PBO help

[AugustineLofthouse]

I've recently received a build with 5800x that came with PBO already enabled with +200mhz core boost override enabled in bios (b550 elite v2). All seems stable and well for the most part, besides games crashing to desktop 3 or 4 hours into a session.

Can anyone explain to me why I hit higher performance and higher temperatures if I go back to stock (PBO disabled) vs the way it arrived to me? I'd have figured this was the opposite of what to expect. I remember reading somewhere if you set that core boost override too high you don't get any actual benefit and it has to be slowly incrementally increased from 0 until you stop seeing benefits. Is this the case? It's tough to find any explicit statement of how it works and ryzen feels like a bit of a dark art at this point.

 

[random_matt]

You done curve optimiser? LLC helps too I think.

 

[AugustineLofthouse]

I haven't, I've literally just bounced between the PBO +200mhz setting ocuk delivered to me and all stock pbo disabled. I haven't much desire to OC at all to be honest and was just wondering why both performance and peak temp increases with stock PBO disabled. Logically this seems the wrong way around.

 

[Joxeon]

It's probably being pushed to hard with the +200 boost and is clock stretching so while it looks like the core is running higher the actual effective clock isn't hitting those numbers.

As for why it's cooler when oc'd it could be that PPT has been adjusted so it forces it to use less power.

 

[AugustineLofthouse]

It's probably being pushed to hard with the +200 boost and is clock stretching so while it looks like the core is running higher the actual effective clock isn't hitting those numbers.

When running benchmarks etc Ryzen Master shows the cores running lower than stock. It just seems as if the auto pbo settings with the +200 set completely hits actual speed with the only benefit being slightly lower temps.

As for why it's cooler when oc'd it could be that PPT has been adjusted so it forces it to use less power.

I thought along these lines myself but it came to me with PBO limits set to motherboard which I can see in Ryzen Master raises the limits considerably above stock, so again, logically going in the other direction.

 

[Wing-Man]

Do you have the ryzen power mode (driver) for for windows installed and selected under power options?

 

[AugustineLofthouse]

Do you have the ryzen power mode (driver) for for windows installed and selected under power options

I don't, just running on the default w10 balanced plan. I did a bit of reading on this and it seemed like the ryzen specific plan was no longer needed as the oem windows one had been updated to provide the necessary functionality.

 

[Wing-Man]

I don't, just running on the default w10 balanced plan. I did a bit of reading on this and it seemed like the ryzen specific plan was no longer needed as the oem windows one had been updated to provide the necessary functionality.

if you not hitting the rated speeds for your CPU, i would give the ryzen one a go, just to tick a box.

 

[philo-sofa]

It's probably being pushed to hard with the +200 boost and is clock stretching so while it looks like the core is running higher the actual effective clock isn't hitting those numbers.

As for why it's cooler when oc'd it could be that PPT has been adjusted so it forces it to use less power.

^^ this, it sounds exactly like clock stretching.

 

[humbug]

Your games are crashing because your 'overclock' is not stable

Take off that +200Mhz, set it back to 0.

First thing to do is set PBO to Advanced, then look for Curve Optimiser sign, set that to negative, set Curve Optimiser Magnitude to 10.

Test that is your games, you should notice it run a little cooler too.

If you're not crashing you can try for +50Mhz on the Max Boost Clock Override, then 75Mhz.....

Play with that, the higher you set Curve Optimiser Magnitude the cooler it will run, its effectively under volting, the higher you set Max Boost Clock Override the higher it will "boost" boost being not all the times, just if it can.

So after testing you might try for Curve Optimiser Magnitude 12 and +75 Max Boost Clock Override.... and so on.

 

[TonyTurbo78]

Your games are crashing because your 'overclock' is not stable

Take off that +200Mhz, set it back to 0.

First thing to do is set PBO to Advanced, then look for Curve Optimiser sign, set that to negative, set Curve Optimiser Magnitude to 10.

Test that is your games, you should notice it run a little cooler too.

If you're not crashing you can try for +50Mhz on the Max Boost Clock Override, then 75Mhz.....

Play with that, the higher you set Curve Optimiser Magnitude the cooler it will run, its effectively under volting, the higher you set Max Boost Clock Override the higher it will "boost" boost being not all the times, just if it can.

So after testing you might try for Curve Optimiser Magnitude 12 and +75 Max Boost Clock Override.... and so on.

Good advice this, I went for a simpler method on my 5950x system I've just built. Set -30 Negative all cores PBO curve optimiser, disabled PBO limits job done. Now boosting to just shy of 5ghz at a fraction of voltage and not even hitting 60c under extreme CPU benchmarking stress tests. I love these Ryzen 5000 series Cpus.

 

[LtMatt]

If you set PBO limits to disabled you are running stock PBO limits, try setting it to Motherboard and see if you notice a change under different workloads.

 

[TonyTurbo78]

If you set PBO limits to disabled you are running stock PBO limits, try setting it to Motherboard and see if you notice a change under different workloads.

I thought that was the idea when it comes to undervoltung. I don't want PBO to throw more power at anything.

 

[LtMatt]

I thought that was the idea when it comes to undervoltung. I don't want PBO to throw more power at anything.

Or you can just manually set your power limits, that way you can fine tune the sort of max temps/performance you want to see.

 

[Twinz]

I think the stock 142w PPT limit is more than enough to get the single-CCD 5800X up against the temp limit. It's a lot of power/heat-density for a single CCD, so getting the cores to boost higher with less voltage (less heat) is probably the best approach.

That being said, I feel like the 5800X is running closer to its max potential "out of the box" vs the other SKU's.