You'll wrong. Just some works on frontend.
No, there are a ton of uarch changes vs previous gen to gen changes with Zen.
The *big* change is wider pipelines. There are many others though and it's very significant.
This is why the performance issues might be compiler related. If so (and I think it pretty likely), then Zen 5 may see big bumps in performance as compilers are updated to make use of the uArch changes.
GN has a good write up here. Again, these are pretty extensive, it's really much more of a change to the uArch going Zen 4 -> Zen 5 than Zen 3 -> Zen 4.
Zen 4 was really much like Zen 3 with support for DDR5 and PCIe 5, which in and of themselves are not really uArch changes.
CPUs AMD Strikes Back: Zen 5 CPU Architecture Changes & Chipset Differences (X870E vs. X870, B850, B840) August 6, 2024 Last Updated: 2024-08-06 We take a look at AMD’s upcoming Zen 5 CPUs and examine architecture changes and accompanying chipsets The Highlights AMD’s Ryzen 9000 desktop CPUs are...
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