AMD Motherboards - 2700X on B450 Pro 4: cannot disable SMT

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2700X on B450 Pro 4: cannot disable SMT

Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=12856
Printed Date: 22 Dec 2024 at 6:14pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: 2700X on B450 Pro 4: cannot disable SMT

Posted By: h3r3t1k
Subject: 2700X on B450 Pro 4: cannot disable SMT
Date Posted: 12 Nov 2019 at 10:52pm

I have the same problem as this guy: http://forum.asrock.com/forum_posts.asp?TID=11614&title=help-with-disabling-smt

In an effort to raise efficiency (only non-AAA gaming use) I wanted to disable SMT. It doesn't work. Prime95 keeps seeing 16 threads. Power cycle didn't help and disabling suspend to RAM didn't work either. I'm on BIOS 3.31 and it explicitly states in the notes that disabling SMT is supposed to work.

Also setting cTDP as seen here: https://www.reddit.com/r/Amd/comments/9mxs88/ryzen_7_2700x_ctdp_test_15w_vs_35w_vs_65w_vs_auto/ is not working either. The option doesn't exist.

The only thing I can do is set downcore to 4+0 in order to get 4c/8t which acutally works. I'd much rather disable SMT or set cTDP to 65W tho.