System does not run up to speed

[yurikvelo]

Install RyzenMaster utility to monitor Temperature and clocks.
Even if CPU is able to run higher clocks, after it approaches certain Temperatures - clocks go down.

[mclane]

If the system is not fast the temperature throttles it down.

[wickedpotus]

That‘s not the point.
Doubling kn/s will bring between +1 and +5 elo = +3 elo (= 10 wins and 990 draws), depends on what he is doing and how he is testing.

A 5900x is more like 4-5 times the speed of an M1 max. and your estimates of speed doubling are Sh*t.. With your brainless reasoning he should just buy a Snapdragon 662 based phone and run SF on.. Better than half the performance of an overprices poser-laptop from Apple and much less power-draw...

[Ras]

Conclusion: New cooling solution required

Cooling is easy to go wrong with. It starts out with brands who exploit their "big brand" image to push overpriced prebuilt crap to customers (Dell, HP), but today's PC cases in general are often misdesigned nonsense with no proper airflow, like massive glass front panels. There should be flow from the front to the back, ideally with more intake than outlet to build up positive pressure, and a dust filter mesh at the front.

Then the CPU cooler itself should be a twin tower cooler like Noctua NH-D15. Or water cooling, but then a big solution because usual AIOs tend to perform worse than a NH-D15 while also being less reliable and requiring more maintenance. Thermal paste is another factor, and for that kind of build, I'd go with Noctua's NT-H2. Finally, forgetting to peel off the plastic sheet from the bottom of the cooler does happen in reality.

[Modern Times]

Then the CPU cooler itself should be a twin tower cooler like Noctua NH-D15. Or water cooling, but then a big solution because usual AIOs tend to perform worse than a NH-D15 while also being less reliable and requiring more maintenance. Thermal paste is another factor, and for that kind of build, I'd go with Noctua's NT-H2. Finally, forgetting to peel off the plastic sheet from the bottom of the cooler does happen in reality.

Well, a decent AIO should run for several years maintenance-free. I'd argue it is less maintenance than a tower cooler - cleaning the fans and filter periodically on an AIO is a darn sight easier than removing the fans from an air cooler and blowing all the dust out of the fins, and re-fitting them. Some of the fan clips used are an absolute nightmare to re-fit in situ.

What not to expect from an AIO water cooler is a noise reduction. My 360 AIO makes far more noise than something like the the Noctua NH-D1 ever would. I think I'm going to alter the fan profile to slow them down and let the CPU run a bit hotter, within its design specs.

[Ras]

removing the fans from an air cooler and blowing all the dust out of the fins, and re-fitting them.

That's what you shouldn't need to do if you have a case with intake filters and positive pressure. It also helps to put the case somewhere elevated, not directly on the floor. Plus that air coolers don't break, except maybe the fans which you also have with an AIO anyway, but you don't have the pump as weak spot.

Even the cooling performance is dubious with AOIs. Linus Tech Tips have a video, here a direct link to the relevant slide: https://youtu.be/23vjWtUpItk?t=533. A Corsair 360mm AOI performed worse than Noctua NH-U12A (that's not even NH-D15 level) while also being louder and more expensive. They used an Intel 9700K which should be comparable to a 5900X in terms of power draw.

[cma6]

[quote=ChickenLogic post_id=910895 time=1636172004 user_id=11578]
[quote=cma6 post_id=910887 time=1636156819 user_id=7478]
I'm running the latest SF an a system with AMD Ryzen 5900X 12-core, overclocked to 4.3 GHz. Large Pages have been enabled. But while using infinite analysis in the Aquarium GUI, CPU never goes above 3.9 GHz. Is there some setting I must change in SF parameters or in BIOS?
Thanks to the experts.

A) fixed overclocks with Zen based CPUs make little sense imho
B) The CPU will throttle down a lot if it gets too hot. It isn't the first time Stockfish has proven cooling solutions to be insufficient.
C) No you can't change that behaviour. Even if you could, it would cause your CPU to overheat way past 110°C and probably break it in a very short period.
Conclusion: New cooling solution required to run SF at 4.3 GHz. Don't go for a fixed clock. Instead, adjust PBO II to use less voltage so the CPU is cooler and clocks higher. This way it'll also go much higher than 4.3 GHz if a single threaded work load is thrown at it.

I should have been more specific in procedure used. I don't have PBO but rather a program called Ryzen Master, which I use in Manual mode to O/C CPU Clock Speed to 4.725 Ghz with voltage of 1.38125 volts and a stable O/C.
However, after reboot (immediately or next morning), even though the above manual settings remain, system will run only at 4.4 Ghz.
Therefore, how do I use PBO to get the settings which I know work: 4.725 Ghz with voltage of 1.38125?