The AMD processor programming reference has revealed an interesting bit of information regarding the Ryzen 7000 “Phoenix” chips. As per the documentation, the upcoming series of APUs will feature SKUs with a hybrid architecture, meaning they'll pack performance and efficiency cores.
InstLatX64 (via VideoCardz) found a Phoenix 2 hybrid APU (2 P-cores + 4 E-cores) on MilkyWay@home. This APU has the “A70F80” CPUID, which belongs to the upcoming series of Phoenix 2 APUs. Based on what we've heard, we would assume that the two performance cores are Zen 4, while the four efficiency cores use the Zen 4c architecture.
#AMD in the Phoenix1 Processor Programming Reference (PPR) uses the same phraseology for the big and little cores as #Intel https://t.co/4gWXpC8Bkg https://t.co/2RbTR2DRWV pic.twitter.com/8JmBB0RIzt
— InstLatX64 (@InstLatX64) March 24, 2023
Days later, the same user found that the Phoenix 1 (AMD Family 19h Model 70h) processor programming reference mentions both performance and efficiency cores in the documentation, suggesting that chips based on this design can also employ a hybrid architecture. If that's the case, Phoenix 2-based APUs won't be the only ones using a hybrid architecture, as Phoenix 1-based chips can also feature performance and efficiency cores.
Elsewhere on the web, Xino (via Wccftech) shared a graph demonstrating the clock frequency behaviour of an early engineering sample of the 2C+4c Phoenix APU on the Cinebench R23 benchmark. Here, you can see that the performance cores can go up to 5GHz, while the efficiency cores max at 4GHz. Although the leaker didn't share the benchmark scores, they stated that P-core single-core performance is on par with the Ryzen 7000HX/HX mobile chips.
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KitGuru says: Intel has been releasing hybrid CPUs for a while now and if these leaks are accurate, it looks like AMD will soon have its own.