is this how you turn off SMT on ryzen ?

[wassil]

hey guys new to pc i have ryzen 5 3600 is this how you turn off SMT?

 

is turning off SMT will harm your cpu ?

[Mateyyy]

I'd do it in the BIOS instead of Ryzen Master.

It's not harmful, just probably not really beneficial either.

[Haro]

7 minutes ago, wassil said:

is turning off SMT will harm your cpu ?

Not harmful 

But pointless.

[wassil]

13 hours ago, Mateyyy said:

I'd do it in the BIOS instead of Ryzen Master.

what will be the diffrence ?

 

13 hours ago, Mateyyy said:

just probably not really beneficial either.

i saw videos that there is fps gain in gaming i'll test it and see

[wassil]

13 hours ago, TofuHaroto said:

Not harmful 

But pointless.

100% true just tested i even had stutters when the cpu hit 100% usage

[GoldenLag]

6 minutes ago, wassil said:

what will be the diffrence ?

Lower performance in general of anything multithreaded. 

 

7 minutes ago, wassil said:

saw videos that there is fps gain in gaming i'll test it and see

Very few titles. 

 

You get lower performance in most titles. 

 

This includes stuttering in newer ones. Mostly due to lack of threads. 

[BlackManINC]

 

53 minutes ago, wassil said:

what will be the diffrence ?

 

i saw videos that there is fps gain in gaming i'll test it and see

The performance boost you may see at all will be very hit or miss at best. You're likely not going to see an improvement in most of your games, and you might even see a decrease in performance. The only game I have where disabling smt worked was Hitman 2. 

 

 

 

[Nena Trinity]

Disable SMT in BIOS, also check that the desired game actually benefit before doing it. HAVE FUN! O3O

[DeadlyMixRecordingStudios]

Kind of an old post BUT... It is absolutely NOT pointless in certain situations. Infact, if you're asking how to disable it there is one VERY good reason you may be asking.

Steinberg's Cubase and Nuendo (from v6 on) have a feature called ASIO-Guard. ASIO-Guard is meant to boost performance but, it often conflicts with Intel's Hyperthreading and AMD's SMT. If you're using a PC, you're able and may be looking to disable SMT if:

You're using what seems like a rather light workload for your CPU yet you keep getting clicks, pops, or even freezing due to overloading on the VST meter. If you're experiencing issues due to the VST meter in Nuendo/Cubase showing spikes/peaking/overload but you've checked your CPU and RAM performance in task manager and it shows your CPU usage nowhere near 100%... You'll need to disable SMT/Hyperthreading in BIOS.

Take it from me. I was experiencing this issue for months when I first updated from Nuendo 4 up to v9. It forced me to close the studio down for awhile because I had no idea what was causing it. The CPU exceeded the requirements, boosted RAM past the 64gb everyone says is the max any DAW will use, ran performance tests  in other DAWs that far exceeded the workload in Nuendo; yet the issue remained. My workaround came by building a network of servers to offload plugin processing but, as soon as I started patching out through hardware audio processors (analog EQs/compressors, etc), the issue came right back.

The reason is a conflict between ASIO-guard and SMT/Hyperthreading. Disable it, if you have this issue with Nuendo or Cubase.

Hopefully posting this response will help anyone Googling this problem.

[TecnoGaming]

I wanted to post my findings for posterity because I just CAN'T BELIEVE people rushed so fast in making asumptions without any bit of actual evidence of it.

I had been suffering stuttering for as long as I can remember and the worse, kind, micro-stuttering.  Mostly on CPU intensive games.

My current PC is as follows:

• Ryzen 9 3950X @ 4Ghz
• 80GB DDR4-3200 @ 2866
• Gigabyte X570 Master
• Latest BIOS as of October 2022

The stuttering with my RTX 3080 was so high that I ended up getting an RTX 3090 Ti a month ago (yes, days before the 4090, I know).

The card itself was noisy as hell so I went on full open loop here.   A 360mm 30mm think radiator, custom corsair loop with an EKGW pump and massive fans (Phanteks T30-120).  My temps are now 51 degrees celcius full load for an RTX3090 Ti running at 2070Mhz clock!

 

I say this so you have a background of my current predicament and how I solved it.

 

Massive lag spikes and microstuttering was experienced on:

• Fortnite (as of 10/20/2022)  (average FPS 105, low 22)
• Dying Light 2 (average FPS 59, low 27)
• Shadow of the Tomb Raider (average FPS 96, low 46)
• A lot of other games.

 

Now, what I did.

I simply disabled SMT in BIOS.

 

Since not having SMT also improved my overclocking,  I could bump the core clock to 4.27 rock solid with 1.26v but just at the same clock speed (4Ghz) I get now

 

• Fortnite (as of 10/29/2022) (average 110, low 68)
• Dying Light 2 (averange FPS 61, low 51)
• Shadow of the Tomb Raider (average 95, low 58)

 

The change for me was MASSIVE in the low-FPS.  I can also see a much better CPU utilization across the board,  Fortnite for example was using no more than 29% of CPU while  now it reaches up to 43%, Dying Light 2 was using barely 11% while now it's using 29%).  Granted it has fewer threads but the output temp is mostly the same, meaning it is NOT using more power but in fact using a similar amount, just more efficient.

 

Windows is also more snappier than before.  Now I only have 16-cores but I prefer this any day to a 32-threads monster that invade my gaming sessions with micro-stutter.  Maybe this is not happening on more recent CPUs,  I will transition to the 7000 series soon, but Rayzen 9 3000 series definitely has some internal issue with SMT that is affecting games.

 

I'm not using any AMD drivers or power profile whatsoever,  just plain old Windows.  My reasoning is that I don't want to software patch the CPU,  it should work correctly as it is.  My assumptions were correct,  similar issues happened to me on Windows 11 when I've tried it,  maybe this CPU does not cut it with SMT in gaming but after days of searching the internet, I got 0 references or articles testing micro-stuttering AT ALL.

 

I hope that my experience is useful to anyone that may still be suffering this issues.  For me, turning off SMT gave me 4 instant benefits.

 

• Micro-stutter in games was completely eliminated.
• Better low-FPS in almost all games.
• Higher overclocking than before, able to reach frequencies not possible with SMT On
• A more snappy Windows experience.