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Adept III
Adept III

When I disable SMT, standby mode disappears on Windows 10.

Hello.

System specs:

Ryzen 5 1600 - Stock Speed

MSI B350 PC MATE MOBO (BIOS VER. : 7A34vA7)

Crucial 2 x 8 GB DDR4 2133 Mhz CL15 RAM

WD10EZEX 1 TB HDD

ASUS DUAL GTX 1060 3 GB Stock Speed graphics card.

Seasonic S12ii 620W PSU.

Windows 10 Home 64 Bit Creator's Update ver. 1703

When I disable SMT in BIOS; motherboard, BIOS or Windows disables standby mode and I can't switch my PC to sleep mode.

Not just MSI, other mainboards are also have this problem:

gigabyte:

http://forum.gigabyte.us/thread/1991/ax370-gaming-windows-sleep-problems

asrock:

http://forum.asrock.com/forum_posts.asp?TID=5928&title=x370-taichi-sleep-issues

Asus:

http://www.overclock.net/forum/11-amd-motherboards/1626011-my-experience-asus-prime-x370-pro-362.htm...

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Can you help me about this? I don't know why disabling SMT also disables standby mode.

Thanks.

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4 Replies
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Esteemed Contributor III

Re: When I disable SMT, standby mode disappears on Windows 10.

From the ASUS thread you linked:

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Adept III
Adept III

Re: When I disable SMT, standby mode disappears on Windows 10.

My old processor (Athlon 64 X2 5000+) doesn't have SMT and it supports standby mode.

Why Ryzen doesn't support standby when SMT disabled?

Will AMD release BIOS update , agesa or something for this?

Disabling SMT, improves performance, lowers power consumption and reduces fps drop problems on some games.

So, I want to overclock it with 6/6 mode. But... no standby mode.

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Esteemed Contributor III

Re: When I disable SMT, standby mode disappears on Windows 10.

Standby mode on a desktop, especially with Windows 10, is fairly meaningless as Fast Boot brings you to the login screen within a few seconds anyway, less than 11 seconds for me.

If you think disabling SMT makes some games run better, and you want to use sleep mode on a desktop, then just disable it for those games by setting the processor affinity to use only the odd numbers in details. As for power consumption, it's not really a factor, even under Prime95 the difference is negligible.

8 threads, SMT disabled

8 threads, SMT enabled

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Adept III
Adept III

Re: When I disable SMT, standby mode disappears on Windows 10.

I tried Cinebench for power consumption testing.

Stock Speed SMT OFF --> 56W max.

Stock Speed SMT ON --> 75W max.

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I also watched some youtube videos. CPU has lower temps, lower power consumption and got better FPS on some games.

I didn't like fast boot, hibernation etc. things. I just want good old standby mode and AMD doesn't support it without SMT.

Do Ryzen 1200 and 1300X  support standby mode ? (They don't have SMT feature you know.)

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