[SOLVED] Xeon 8280 dual processors don't work together ?

Nov 13, 2021
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[Updated] I use this system to simulate on Ansys HFSS.
[Updated1] Problem solved. Please read post #14
Hi everyone,

I'm building a system using dual xeon platium 8280. Everything works well until I run my task. It seem that the two CPUs can not work in parallel, you can see in picture below, only 1 CPU works when I do my task.

I try to set number of processor in system configuration to 56 cores but when my computer restart, it only shows 1 CPU with 28 cores.


image image

Here is my main board

image image

Please help me. Thanks a lot.
 
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Nov 13, 2021
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Uncheck that box!

That puts ALL CPUs, ALL cores into play.
But they don't work together, bro. I can only choose to run on CPU1 or CPU2, but not both at same time.

Please see the picture below. I have 2 systems, one is dual xeon 8280 and remaining is dual xeon 2680. You can see in 2680 system, I don't need to choose which core is used.
 
Nov 13, 2021
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Dual CPU is also based on the application. The vast majority of applications are not dual CPU aware.

So what application, and are you 100% sure of its capabilities?
I used the same application for my 2 systems. The problem only on system using dual xeon 8280. :(
 
Nov 13, 2021
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As said, the software needs to be multi-CPU aware.

Just because there are 2 does not mean the software can use 2.

Contact Ansys, to verify their particular software package is multiCPU aware.
Hi bro,

I found the problem, it comes from hyperthreading. Windows 10 Pro only allows 64 cores per processor group, hyperthreading doubles my physical core so I have 112 core in total. Therefore, 112 will be divided into 2 processor groups. I disabled hyperthreading and everything goes ok.
Hyperthreading can cause problem on Ansys's performance so disabing it is a good idea.
 
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