Threadripper 1950x but StockFish 8 with low KN/s?

[corres]

I think producers know what kind of connector needs their motherboard.
Naturally you need an appropriate power supply, too.
But before over clocking your PC must work well at default settings.
New AMD CPUs are very sensitive to the settings of motherboard and memory. Moreover a CPU with 16 cores needs a very good water cooler,
in particular if it is over clocked.

[Lion]

Well, I have now connected the 2nd cable and it didn't show a difference.

[Lion]

Is it possible that it's because I use Windows 10-64 home and not Pro ?

I have re installed latest bios & chipset, but it hasn't changed anything....

[Modern Times]

Ah, worth checking. Previously the "lower" Windows versions have had a limit on sockets or cores. The NUMA-like architecture of the Threadripper CPU may be confusing things ?

[Lion]

It had to my knowledge a limit on socket but not on cores ?!
I anyway see it using all 16/32 cores 100%

[Eelco de Groot]

It had to my knowledge a limit on socket but not on cores ?!
I anyway see it using all 16/32 cores 100%

I'm just curious, I have no idea what is going on but what are you using to determine that. The taskmanager from Windows 10 is not showing Stockfish, it only shows the GUI It seems to be seriously broken compared to even Windows XP Taskmanager.

I don't know what other people are using, Milos advised Process Explorer. Never got around to trying that but seems worth a try. Have you tried asmFish or Cfish because they have better NUMA awareness, or so I'm told. On the Threadripper that might be important?

If on my modern i7 6700 I go from 4 threads to 7, that is three hyperthreads, the taskmanager goes from 60% to almost a 100%. This actually is another bug in Windows I am told. You also don't see the chess engines listed in the list of processes, so in that list of processes you can't see where the 100% is actually coming from. This bug was not in old Windows XP taskmanager. XP more than 10 years old now. But back to hyperthreading, just one example with 7 threads.

I am surprised that there are still ppl that use Windows Taskman. Just replace it with Process Explorer (practically a Microsoft tool that exists for almost 2 decades now) it is infinitely better.

[corres]

I can not imagine why you unwilling to set BIOS to DEFAULT??
At first your PC must work well at default settings!
If it does not work well at default settings you ought to check all main component of PC: power supply, cooler and the temperature of CPU at full load, memory and its type to be appropriate to your motherboard und so weiter.
You get a lot of information about your PC and every each cores with the help of HWINFO 550 (64bits) what you can download from internet. This tool shows not only the frequency of each cores but the power consumption and temperature of them. So you can see really that all cores work or not.
But.
Before all, you do check the chess GUI used by you and the settings of Stockfish 8 (MODERN, no BMi2 or other!) x64 in that GUI.
A note: From Arena-s the version of 3.5.1 is appropriate to modern CPU.

[Lion]

I did all you said, reason I am writing here.
Other than Arena/Cb Gui running chess engines, other benchmark such as CB15 seems to provide good results.

[corres]

You wrote about "second cable" only.
If CB15 is good for you use it.
I use ChessBase Fritz 11 GUI because the newer Fritz GUIs have some issue.
If you do not use Arena 3.5.1 download it from internet and try it.
Good luck!

[Lion]

Thanks.
I tried with Arena and it displays about the same kn/s as Fritz GUI.
What is surprising is when doing a Cinebench B15 test, it seems to perform normally with more than 3'000 score.