Windows won't use all threads on 6 core CPU with hyperthreading

Hello guys,

I remade this post, as the previous one apparantly got lost, and I also forgot to include the Windows Version Number, which is Windows 10 64-bit version 1903 (Build 18362.418).

My CPU is a Xeon X5650 in an ASUS P6X58D-E motherboard with 12GB of RAM.

I turned Hyperthreading (HT) off, to test whether I got more FPS in a game. Then I turned HT back on, but windows would not see the extra threads anymore. It only sees 6 core/6 threads now, whereas it saw 6 cores/12 threads before I turned off HT.

I have reset the bios, by clearing the CMOS several times, and loaded defaults, and set everything up again, and made sure HT is enabled, but windows keeps being stubborn.

Is there a fix to this? Has anyone experienced HT being stuck like this? Is there a way to force windows to use HT again?

Thanks in advance, Peter.

bro67 said:

What bios ver. is flashed on your motherboard?

0803, but this morning I booted up on a Ubuntu CD to check the CPU. It listed it as 2 threads per core. Then I rebooted into windows, and it correctly showed all 12 threads... Makes no sense... But it works now :)

Closing thread.