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#1 2019-09-04 13:11:47

ratcheer
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From: USA
Registered: 2015-10-05
Posts: 219

Turn off hyperthreading with old Award BIOS

So, I've been reading more and more strong suggestions to turn off hyperthreading, and yesterday I decided to give it a whirl. I read a few articles on how to do it.

But my old desktop PC with a Gigabyte Z68A-D3-B3 motherboard uses an Award BIOS. I have looked through every menu and I cannot find a setting to disable hyperthreading. The articles made it sound easy: find a CPU menu, then a Properties sub-menu. But, I can't find it in mine, or anything else that would let me do it.

Oh, it is an Intel i5 CPU and the system is more than 8 years old. It is definitely running hyperthreading.

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#2 2019-09-04 13:35:31

C#Coder4ever
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From: /dev/zero
Registered: 2015-09-29
Posts: 261

Re: Turn off hyperthreading with old Award BIOS

You're good my man, Sandy/Ivy Bridge era i5's are actually not hyperthreaded, they only have 4 cores and 4 threads. If it were hyperthreaded it would look like it has 8 cores but is actually 4 cores 8 threads. Hope this helps!


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#3 2019-09-04 14:05:43

earlybird
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Registered: 2015-12-16
Posts: 717
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Re: Turn off hyperthreading with old Award BIOS

ratcheer, to make sure you can type 'lscpu' and if the line 'Flags' does not have the word 'ht' in it the CPU does not have hyperthreading support and you're golden. Alternatively, you can just look up the exact CPU model name (also from lscpu) on ark.intel.com.

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#4 2019-09-04 14:12:44

clusterF
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Registered: 2019-05-07
Posts: 143

Re: Turn off hyperthreading with old Award BIOS

Openbsd was right.

https://www.youtube.com/watch?v=jI3YE3Jlgw8

My old hardware has ht, not turning it off though.

Last edited by clusterF (2019-09-04 14:14:13)


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#5 2019-09-04 15:00:43

ratcheer
Member
From: USA
Registered: 2015-10-05
Posts: 219

Re: Turn off hyperthreading with old Award BIOS

@earlybird - The Flags does have ht in it.

Flags:                           fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm
                                  pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf p
                                 ni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 popcnt tsc_deadline_timer ae
                                 s xsave avx lahf_lm epb pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid xsaveopt dtherm ida arat pln
                                  pts md_clear flush_l1d

On the other hand, other parts of the output say 4 CPUs and 1 thread per core.

Last edited by ratcheer (2019-09-04 15:04:09)

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#6 2019-09-04 17:26:32

Sector11
The Tpyo Knig Mod
From: 77345 ¡#
Registered: 2015-08-20
Posts: 5,528

Re: Turn off hyperthreading with old Award BIOS

I'm new to the "Intel" world ...

 04 Sep 19 @ 14:24:22 ~
   $ cpu
CPU:       Dual core Intel Core i3-7100 (-HT-MCP-) cache: 3072 KB
           flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 15648
           clock speeds: min/max: 800/3900 MHz 1: 1509 MHz 2: 1969 MHz 3: 2052 MHz 4: 2246 MHz
 
 04 Sep 19 @ 14:24:26 ~
   $ 

lscpu - Flags: has ht ... so it is ON!

Why exactly would I want to turn hyper-threading off?

Would love an i5 or more.  i9 would be nice {evil grin} but i7 would be cool too.

Last edited by Sector11 (2019-09-04 17:27:13)


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#7 2019-09-04 18:05:29

eight.bit.al
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From: The top of the World
Registered: 2015-10-01
Posts: 297
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Re: Turn off hyperthreading with old Award BIOS

^

Intel CPUs fall to new hyperthreading exploit that pilfers crypto keys

8bit

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#8 2019-09-06 19:24:01

Sector11
The Tpyo Knig Mod
From: 77345 ¡#
Registered: 2015-08-20
Posts: 5,528

Re: Turn off hyperthreading with old Award BIOS

Awwwwwwwwwwwww so I gotta turn it off ... looked nice in my conky.

Intel Core i3-7100 = Kaby Lake

Wait a sec ... if I don't use any  cryptology or a cryptographic key is it still an OOPS?


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