AMD Strix Point SoC "Zen 5" and "Zen 5c" CPU Cores Have 256-bit FPU Datapaths
AMD in its architecture deep-dive Q&A session with the press, confirmed that the "Zen 5" and "Zen 5c" cores on the "Strix Point" silicon only feature 256-bit wide FPU data-paths, unlike the "Zen 5" cores in the "Granite Ridge" Ryzen 9000 desktop processors. "The Zen 5c used in Strix has a 256-bit data-path, and so does the Zen 5 used inside of Strix," said Mike Clark, AMD corporate fellow and chief architecture of the "Zen" CPU cores. "So there's no delta as you move back and forth [thread migration between the Zen 5 and Zen 5c complexes] in vector throughput," he added.
It doesn't seem like AMD disabled a physically available feature, but rather, the company developed a variant of both the "Zen 5" and "Zen 5c" cores that physically lack the 512-bit data-paths. "And you get the area advantage to be able to scale out a little bit more," Clark continued. This suggests that the "Zen 5" and "Zen 5c" cores on "Strix Point" are physically smaller than the ones on the 4 nm "Eldora" 8-core CCD that is featured in "Granite Ridge" and some of the key models of the upcoming 5th Gen EPYC "Turin" server processors.
It doesn't seem like AMD disabled a physically available feature, but rather, the company developed a variant of both the "Zen 5" and "Zen 5c" cores that physically lack the 512-bit data-paths. "And you get the area advantage to be able to scale out a little bit more," Clark continued. This suggests that the "Zen 5" and "Zen 5c" cores on "Strix Point" are physically smaller than the ones on the 4 nm "Eldora" 8-core CCD that is featured in "Granite Ridge" and some of the key models of the upcoming 5th Gen EPYC "Turin" server processors.