The naked die appears on Twitter via a prolific hardware leaker named @9550pro/HXL. It shows both Zen 4 and Zen 4c cores side-by-side for the first time, indicating AMD is set to launch this new piece of hardware soon, focusing on efficiency over outright horsepower. According to a further breakdown provided by HXL, the Zen 4c cores are roughly 35% smaller than their big brothers. Yet, they offer the same instructions-per-clock (IPC) along with the same ISA as Zen 4, a different approach compared with Intel. So far, the Zen 4c dies have only appeared in its newest server chip, the 128-core Epyc Bergamo CPU.
AMD's first hybrid APU reportedly sports 2 Zen 4 cores, and 4 Zen 4c cores for 6-cores and 12-threads. Credit: @HXL On Twitter/X
According to Videocardz, the pictured die features two Zen 4 cores and four Zen 4c dies, offering six cores and 12 threads. In contrast to Intel's approach with its efficiency cores, AMD's smaller cores also offer two threads per core, or hyperthreading to borrow Intel's terminology. This hybrid chip will be used for midrange and entry-level laptops and gaming handhelds and is designated for two CPUs, including the Ryzen 3 7440U and Ryzen 5 7540U.
Despite appearing kind of large in the photo, it's a bit smaller than its Zen 1 predecessor, which sports eight Zen 4 cores. The Zen 1 die reportedly measures 178mm squared, with Phoenix 2 at 137mm squared. AMD seemingly cut down the GPU portion of the APU by a significant amount to make the chip smaller, as its GPU features just four RDNA 3 compute units, compared with 12 and eight found in Phoenix 1. Despite the smaller GPU, it's expected to be featured in Z1 non-extreme APUs for handheld gaming devices, but nothing has been announced so far. https://www.extremetech.com/computing/amds-first-hybrid-processor-has-been-photographed