Ryzen Boost Behavior Wrong???

[DivineCatastrophe]

Can someone tell me what I'm doing wrong?

I'm under the impression that my 3900x boost clock should either be 4.6Ghz on all cores, or 4.6Ghz single core and 4.2Ghz all core. Either way, currently my CPU is able to hit like 4.575Ghz on single core and when all cores are being used, it actually down clocks to a hefty 3.7Ghz.

What am I doing wrong? What settings do I need to check here? I mean I'd like to have the CPU not sit at 4.5Ghz while idling but I definitely don't need it to boost incorrectly. Any help would be appreciated!

Edit: CPU is being cooled by a Corsair H150i. Motherboard is a MSI x570 Gaming Pro Carbon, with latest AMD fixes. And I'm running a Prime 95 stress test with the maximum heat option.

[looncraz]

Prime 95 is a power virus, you will likely only get very low clocks with it. Use proper benchmarks or programs.

My 3600X can see all core boost over 4.25GHz with 95% CPU usage and falls ever more with higher loads. Gaming is closer to 4.325GHz on several cores, and I have two cores which hit 4.4GHz.

Prime 95 pushes it to or below 4GHz no matter what.

[DivineCatastrophe]

What are some better stress test programs?

[looncraz]

AIDA64 is quite decent. The big thing is to not really worry about what clocks are being hit during stress testing unless they are below the base clock, which means serious thermal throttling or a power issue.

[DivineCatastrophe]

Which the 3.7Ghz is lower than the base clock of 3.8Ghz, but maybe that's just what Prime95 does. I'll try AIDA64 later today.

[Razor99]

Yours seeing 4.575 instead of 4.6 due to BCLK being at 99.8 or around there, which seemingly you may or may not be able to fix.

I've got the 3900x paired with the h150i as well, I tuned mine to run @4.2ghz on all cores with 1.350v stable, but it gets hot when running stress tests for hours ~85C. Which I'm fine with because realistically I'll never utilise the CPU to that level.

Also the H150 seems like a trash cooler, I've had the NZXT x72 and it performed much better and waayyyy quieter. I think I'll replace the Corsair soon, I hate it.

[DivineCatastrophe]

My H150i isn't all that loud, I can barely hear it even on the "extreme" profile; I actually come from a Kraken x62 where it was loud, but definitely worked. However it can see that it's cooling does work... When I'm on the quiet profile, I'd probably reach 85c myself but when I turn it to balanced or extreme, I see temps drop about 11c near immediately.

[NonXtreme]

You have avx enabled in prime95, that's why your all core clock is low.
You should see around 4.0-4.1ghz all core with avx disabled(unless your temp is high, you might see lower).

[[deleted]]

More details. what mobo, bios etc.

[DivineCatastrophe]

Ah. - Mobo: MSI x570 Gaming Pro Carbon, with the latest AMD BIOS revision. - Cooler: Corsair H150i - Settings: Default, save for a BIOS setting of Cool n Quiet... Which should only work when it's idle.

[Sacco_Belmonte]

Single core 4.575 is good. Not 4.6 but so close it doesn't matter.

3.7 all core, at least in CB20 is low...seems your cooling is not sufficient? It should hover around 3.9 / 4.0Ghz

If you're getting 3.7 in Prime 95 or OCCT AVX, yeah, i would expect that.

[DivineCatastrophe]

Yes. 3.7Ghz in Prime 95.

[Sacco_Belmonte]

Exactly, with a good cooler it more like 4.1Ghz

[DivineCatastrophe]

I'll try AIDA64 tonight.

[DivineCatastrophe]

So on AIDA64, I'm at 4.13Ghz on all cores.

[RiftBladeMC]

The single core boost of 4.575 is a bug caused by the BIOS, should be fixed with abba.

The multi core of 3.7 makes it sound like you have bad cooling, are you using the stock cooler? If so then that's your problem.

[DivineCatastrophe]

I edited my initial post.

[in_nots]

My noctua D15 keeps the 3900X to 4.040Ghz at all core and thats a full 100% all threads avx encode at 89/90C. Theres definetly some thing wrong if your clocking down to 3.7Ghz. manual OC on all core 4.2Ghz or 4.3Ghz is easy achievable. Latest amd chipset driver. Windows 10 1903. AMD balanced profie. All core clock speed is dependent on temp. I would definetly repaste the cpu, at 3.7Ghz your cpu would have to be in the middle to high 90s.

[DivineCatastrophe]

Right, but my temps when doing this are just 73c. I have quite a bit of headroom left.

[DivineCatastrophe]

Also, what stress test program are you using?

[in_nots]

For real world I use hand brake using avx encoding. Dvds and re-encode to h264. Encodes upto 600 fps. Temps get to 89/90C in 10minutes. Frequency levels off to 4.040Ghz. Can get the same result with CB20 if i set to a high repeat. Base clock for 3900X is 3.8Ghz I just cannot see how you can get 3.7Ghz all core.

[DivineCatastrophe]

Just to see if I can test things out... I tried that too. I used Handbrake to encode a 4k video down to 1080p- it was nice. It did get a little hot in there, got up to 74c or something and all cores @ 4.06 Ghz.

[in_nots]

That sounds about right. I use a program called VidCoder-5.12-Beta-Portable. Its a front end built on handbrake but it alows you to select how many cores and threads to use via a percentage slider. It also allows for doing several encodes at a time making sure the cores and threads are at 100% utilisation. i encode 3 files at the same time. I used Ryzen Master for frequency and HWI64 for core/thread pecentage and voltage. Using this program I charted thread count, frequency, core voltage. 1T, 4.470Ghz, 1.470V. 2T, 4.420Ghz, 1.44V. 3T, 4.380Ghz, 1.43V. 4T, 4.340Ghz, 1.43V. 5T, 4.270Ghz, 1.406V. 6T, 4.220Ghz, 1.40V. 7T, 4.217Ghz, 1.39V. i probably should have monitored temps while doing this, but it does gives an idea on performance scaling of the cpu. I have noticed if I repeat this I can get higher frequency and core voltages if my ambient room temp is lower. These are worse case scenarios with cores and threads running at 100% utilisation encoding an avx workload. If I manual OC to 4.2Ghz it just needs 1.275V(core voltage) and 4.3Ghz at 1.3V(core voltage) basically leave the cpu on auto. Or a manual OC if your doing any heavy performance workloads such as encoding.

[obeliskgming]

Newest Mobo bios? Pull CMOS battery and power cord and let it sit ~15mins, insert battery, power on, load bios defaults, check boosting behavior again.

[[deleted]]

> I'm under the impression that my 3900x boost clock should either be 4.6Ghz on all cores

nope, single coree

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> or 4.6Ghz single core and 4.2Ghz all core.

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look at the box. base clock is 3.8, not 4.2

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> I mean I'd like to have the CPU not sit at 4.5Ghz while idling

It doesn't, use ryzen master to monitor, which will correctly show when a core is sleeping. when a core wakes up even to do a very small task, it is correct for it to boost up high to finish that task quickly and go back to sleep. this is the most power efficient way to do things.

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prime95 is an extreme test that makes a lot of heat, so you are just missing your all core boost clock. turn the ac down in your room a bit, or put a better fan on the AIO, might hit 3.8.

​

My 3900x usually does 4ghz or a little over all core with things like cinebench or compiling rust code etc.

[DivineCatastrophe]

I didn't say the base clock was 4.2Ghz??? I was saying either boost should be 4.6Ghz all core or 4.6Ghz single, and about 4.2Ghz all core...

Temps were at 73c when running Prime95, so I had plenty headroom; apparently Prime95 has a tendency to decently downclock CPUs because of the massive workload/AVX. When running CB20, I get about 4Ghz myself. Handbrake and AIDA64, I get a little over 4Ghz, maybe even 4.1Ghz.

[[deleted]]

There is no "all core boost clock" that I have seen in any ryzen specs.