this post was submitted on 10 Aug 2024
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We found the missing performance: Zen 5 tested with SMT disabled (www.techpowerup.com)
submitted 1 month ago* (last edited 1 month ago) by [email protected] to c/[email protected]
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AMD advertised a roughly 16% IPC increase for Zen 5 over the previous Zen 4 architecture, and while we are fully aware that IPC doesn't linearly scale with gaming performance, we were a bit surprised to find that the 9700X and 9600X are no more than 3% faster than their predecessors in the most CPU-bottlenecked 720p gaming benchmarks.

Such a deviation from AMD's claims took everyone by surprise in the tech press, some reviewers even wondered initially if they had bad samples, there's plenty of discussion and drama in online communities. Like everyone else, we did several rounds of re-testing, and tried poking and prodding with the settings to figure out if we could better understand the architecture. Through the course of our testing, we found some interesting core scheduling behavior, and set out on an adventure.

Our argument with this article is not that SMT is the way to go [sic], but rather that there's something in the SMT or non-SMT behavior that affects performance on Zen 5 more than on previous processors.

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