PC Ekspert Forum - View Single Post - AMD Ryzen "ZEN5" (9000 CPU series) Info thread

The Exiled · 10.08.2024., 13:15

AMD keeps screwing up

EDIT:

Citiraj:

We found the missing performance: Zen 5 tested with SMT disabled

Citiraj:

We recently published our reviews of the AMD Ryzen 7 9700X and Ryzen 5 9600X processors powered by the Zen 5 architecture. These new chips offer contemporary levels of performance in their market segments, and are highly efficient, thanks to AMD building them on the low-power 4 nm TSMC N4P process, to the extent that AMD rated them with 65 W TDP. 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.

In conclusion, AMD's Zen 5 architecture offers promising advancements, with particularly impressive single-threaded performance, but the unexpected SMT scaling raises many questions. In the past AMD has made changes to the behavior of their processors through AGESA BIOS updates, I think they will address the scheduling similarly.

Izvor: TechPowerUp