[SOLVED] How does ryzen boost work ?

[simmyx]

Ryzen 5 3600. How does boost work ?

 

[Colif]

It is a good guideline to know that light workloads experience the highest boost frequencies, while heavier multi-core and/or sustained workloads are more likely to encounter a limit and receive less boost.

See here for how Precision Boost 2 works - https://www.amd.com/en/support/kb/faq/cpu-pb2

 

[drea.drechsler]

Ryzen boosting works on the basis of available thermal and power (from the VRM) headroom. It will boost to maximum clocks on light, bursty type loads and on a single core at a time. As the processing load increases, across multiple threads of execution, it will lower boosting to a mid-range clocks on all cores. As temperature in the CPU core begins to rise it will pull back on the mid-range clocks in order to protect the CPU.

The max single-core clock and mid-range clock speeds depend on particular CPU, as is the lowest rated clock at high temperatures. The boosting can be 'gamed' a bit with PBO which basically tells the algorithm to pretty much ignore current and power limit established for your VRM. You can also keep it at the mid-range clocks longer with better cooling.

The whole thing is very much temperature sensitive. Different cases and cooling and even heat load from adjacent GPU's can affect exactly how individual CPU's will perform. On my 3700X, running in PBO under a 240mm AIO, I get 4.4-4.425Ghz boosts when I run a Defender quick scan. Playing a game that's heavily threaded it's running in the 4.3-4.35Ghz range (but lots of changes as it only boosts when needed). In a Cinebench 20 MT run it will drop to about 4.2-4.25Ghz, all cores and pretty constant throughout the whole run. A 3700X is rated with 3600 base clock, 4400 boost.

In no case will you ever see the rated max clock in an all-core AVX heavy workload like Cinebench.

 

[simmyx]

Thanks
So the fact when I'm playing cyberpunk, most of the cores are running about 3.8ghz and that's fine right? As it is a 3.6ghz cpu

 

[Colif]

3.6 is base clock, if its boosted to 3.8 it should be fine.

I ran cinebench yesterday, single core test, one core hit about 4.4ghz and multi was around 4.2ghz each core.
3600XT

 

[drea.drechsler]

Thanks
So the fact when I'm playing cyberpunk, most of the cores are running about 3.8ghz and that's fine right? As it is a 3.6ghz cpu

If you're using Ryzenmaster it's probably just averaging 3.8Ghz over a long polling period. It's probably boosting frequently, as a process needs attention, and then idling back for a bit before another process makes it boost again.

For reporting out CPU core clocks RyzenMaster is very limited, you might try using a different monitoring program. The best one is HWInfo64 with the polling interval set to 500mS. You can create a graph for each core's boost clock to monitor it over time and you'll see the boosting action in light loads (which games tend to be, even CyberPunk).

 

[Colif]

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www.hwinfo.com

it opens with too much info, you could probably just tick sensors and click run
to change the polling, once its installed and running, go to sensors/settings/General Tab. Polling period is right at top -
Once you enter 500 you need to click set or it won't change it.
I just did it myself

I have2 sensor temps showing in my notification area so can always see GPU & Tdie score

He sets his cpu sensor on the package but I found my package always showed same temps recently, might be conflict with Icue, but Tdie is fine.

At least the spikes don't look so bad when you see them immediately drop again

 

[simmyx]

Ok I understand.
I haven't changed any settings in ryzen master however I'll check that auto overclock is enabled .

 

[simmyx]

Can't see auto overclock or anything like that. however whilst using cinebench one core gets to 4.18Ghz

 

[Colif]

that is pretty close

 

[Jmusic88]

Cinebench isn't really a good program to find out what your cpu boosts to. It doesn't really max out your cpu that well.

If you want to truly know what it boosts to, just use a stress program like cpu-z, do a quick stress on it and you'll see what it boosts it to. Or just go in game, and you'll see your cpu will max out its speed. Cinebench isn't a good program to see what it peaks it to at all because it never does. Didn't do it on my 5 3600 and doesn't do it on my 7 5800x.

 

[simmyx]

Cinebench isn't really a good program to find out what your cpu boosts to. It doesn't really max out your cpu that well.

If you want to truly know what it boosts to, just use a stress program like cpu-z, do a quick stress on it and you'll see what it boosts it to. Or just go in game, and you'll see your cpu will max out its speed. Cinebench isn't a good program to see what it peaks it to at all because it never does. Didn't do it on my 5 3600 and doesn't do it on my 7 5800x.

After nearly two hours of cyberpunk, here are the peak speeds. Do they look right ?

 

[drivinfast247]

After nearly two hours of cyberpunk, here are the peak speeds. Do they look right ?

Perfect!

 

[Jmusic88]

After nearly two hours of cyberpunk, here are the peak speeds. Do they look right ?

I use hwinfo64, msi afterburner osb and even ryzen master. Not sure what you used. Seems a little low to me on your other cores, but you could of just lost your silicon lottery. Looks like core 3+4 boosts almost to 4.2ghz. Looks fine for me with respect to that, but normal overall.

For me based on hwinfo64, all my cores fluctuate but they all boost to the same max speeds. On my 5 3600 they all boosted to 4.2ghz and on my 7 5800x they all boost to 4.85ghz (so the peak is the same across all cores).

 

[Colif]

might be cyberpunk also isn't an ideal test either.

i didn't stress test in CPU -Z, just benchmark

All cores =
#00: 4241.40 MHz  #01: 4216.45 MHz  #02: 4216.45 MHz  #03: 4216.45 MHz
#04: 4241.40 MHz  #05: 4216.45 MHz

link

numbers sure are similar.

 

[Jmusic88]

might be cyberpunk also isn't an ideal test either.

i didn't stress test in CPU -Z, just benchmark

All cores =
#00: 4241.40 MHz  #01: 4216.45 MHz  #02: 4216.45 MHz  #03: 4216.45 MHz
#04: 4241.40 MHz  #05: 4216.45 MHz

link

numbers sure are similar.

Yours is an XT version though. It suppose to boost up to 4.5ghz. Vanilla version is 4.2 ghz. So similar but not.

I would just do a quick stress test (literally within secs it should go to your CPU's max speed) and see what's the max.

For me all my ryzens boost up to the the chips's max speeds, cyber punk, cs go, cod warzone/cold war. My in game is always maxed out for those games.

 

[Colif]

does the stress test end itself or you stop it? How long it go for?

 

[Jmusic88]

does the stress test end itself or you stop it? How long it go for?

I don't think it has a limit. I think you need to stop it yourself. I never really use it, I only use it to figure out peak speed really. Prime95 would be the best stress program (in my opinion).

 

[Colif]

that was what i figured. CPU wasn't really going any faster. I will figure this out

CPU -Z seems to be mostly multi core
As if I look at my HWINFO for today, its showing threads boosting to 4.4 (since its threads it shows 12)
columns are Current, MIn, Max & Avg

But that's likely pb2. I know it can go faster, it just isn't. I assume the tests work better if its cooler and its summer here and I need to run AIO fans faster to get temps lower.

Not overly concerned with stressing pc during summer.

 

[Jmusic88]

that was what i figured. CPU wasn't really going any faster. I will figure this out

CPU -Z seems to be mostly multi core
As if I look at my HWINFO for today, its showing threads boosting to 4.4 (since its threads it shows 12)
columns are Current, MIn, Max & Avg

But that's likely pb2. I know it can go faster, it just isn't. I assume the tests work better if its cooler and its summer here and I need to run AIO fans faster to get temps lower.

Not overly concerned with stressing pc during summer.

Whether it gets to 4.4ghz or 4.5ghz, you probably won't notice the difference anyway!

If you use your build for gaming and you upgrade to the 5000 series on the other hand you'll definitely notice the difference 😉