PBO / XFR 3000 series - Definitive values

[opethdisciple]

I want us to agree on what we think are the most generally optimal settings for XFR / PBO for the 3000 series.

I find it frustrating that across different forums and the internet people are using a whole breath of values which I refuse to believe can be so variant.

For example Buildzoid will have you believe that this the best:

PPT: 300
TDC: 230
EDC: 230
Scalar 2x

Others use EDC bugs and set it to 0 or 1 or 10 etc... which I have tried and have seen better scores in benchmarks but I refuse to use something that has no logic.

At the moment I am using the following which @Kevin Matthews gave me in another thread. At least these are based on some logic. I.e these values are the default for 105w CPUs. I can live with that as it is based on science.

PPT: 142
TDC: 95
EDC: 140
Scalar 5x

However is this it, can we say that this is the most optimal XFR / PBO settings there are (with out taking advantage of bugs, as they will get 'fixed' in newer BIOSes)

So what do you say?

I don't want this thread to become a ramble. I want this to be to the point. These values cant possibly be so variant amongst us as we are all running the same 3 to 4 CPUs (3600/x, 3700x, 3800x, 3900x)

It's quite impossible for one to say I'm running 195, 150, 65 and another one say I'm running 76, 3, 99 because I get the impression that a lot of people are just punching in random numbers. (If you look across the internet and forums)

So the point of this thread is to agree on what we think are the most optimal values given everything else is as intended. I.e no third party things like power plans etc.

Official AMD only.

 

[opethdisciple]

I disabled it on my 3950x and got better boosts lol

Well I definitely gain from having it on. 5% in Intel Burn Test and about 250 points in Cinebench. From 4750 to close to 5000.

 

[opethdisciple]

PBO auto
boost override +200
c-States enabled
CPPC enabled
Also other suggestions from ususm like low idle and CnQ enabled.

Also like set my voltage to 0.6 - offset as there was a spreadsheet with values and scores there wasn't much difference.

So you mean your not punching in any values and just setting it to auto values?

 

[opethdisciple]

So it sounds like choosing the option to set the boards default XFR values is the right direction to go down.

What about scalar do we know what's a safe value to use? Aggressiveness.

 

[opethdisciple]

AMD needs to clean this up. PBO should just be an on/off button imo.

Also not duplicated in two separate locations in the BIOS. Honestly who the hell thought it was a good idea to duplicate parts of the bios?

They complain about the 16Mb limitation of the earlier x370 BIOS chips well it isn't helped by unnecessary bloat in the BIOS them selves in the first place.

 

[opethdisciple]

Buildzoid said x4 ( x5 max) in a vid i watched.

Everything i've tested on this chip comes around to the same conclusion - Use AUTO

There are no mystery settings that will unlock any hidden boosts. XFR PBO/PBO2 all behave identical in as much as they do virtually nothing.

Temps ( which are easily managed ) / RAM / Silicon lottery are the only key performance factors.

I've spent hours testing BIOS combinations and voltages etc and guess what i run at now ?

CPU Voltage - AUTO
XFR PBO / PBO2 - Disabled

Confused about this one a bit.

Surely that should be:

CPU Voltage - AUTO
PBO2 enabled
XFR AUTO

That will give it a little more headroom.

At least for me I see about 5%.

 

[opethdisciple]

What's your cooling like @Brizzles ?

Not disputing your results. They are what they are, it's just strange that when you give the CPU more headroom to perform it actually performs slower.

This would indicate that PBO/XFR isn't functioning properly because the very definition of it (if it had a definition) is raising the power limits to enable your CPU to boost higher and for longer.

Given the net result you are seeing is less performance then I'd say it isn't working to specification.

For me it definitely is worth it. + 200 points in Cinebench and a good 5% more flops in Intel Burn test.

In the end I have just left it enabled with auto scalar.

 

[opethdisciple]

As a test I disabled PBO And I am hitting 100% limits in either PPT or EDC and I have lost 5 flops in Intel Burn test.

As far as I'm concerned for the CPU to be achieving what it's capable of it should never hit 100% of any of the three metrics.

 

[opethdisciple]

I gave up on this in the end. 4-5% extra overall.

Instead I've switched to pushing my ram harder.