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There's nothing rebranded about the 4000-series APUs. Sure, they are based on the Zen 2 architecture like the 3000-series CPUs, but they are an entirely new silicon design. 3000-series APUs (Picasso) were 14nm Zen+ chips with up to 4 cores and up to 11 Vega CUs at =>1500MHz. 4000-series APUs are 7nm Zen 2 with up to 8 cores and up to 8 Vega CUs at => 2100MHz. 3000-series CPUs are MCMs (multi-chip module) with 1-2 CCDs (compute core die) and an IOD (I/O die) and up to 8/16 cores depending on the number of CCDs. They have no iGPU at all. 4000-series APUs are monolithic chips which integrate a single CCD as part of their design, but with a distinctly different interconnect architecture due to the monolithic die. They are similar (but not identical) in clock-for-clock CPU performance to the 3000-series CPUs, but still have significant underlying differences (a better memory controller supporting faster RAM, decoupled IF clock rates, lower memory latency due to the monolithic die, etc.). They aren't a new architecture like the Zen 3-based 4000-series CPUs will be, but neither are they rebrands in any understanding of the word. Which is, of course why people are eager to get their hands on them due to the massively increased performance compared to the previous generation of APUs.