And also why they use it for zen5c.
But if they can't get high enough clock speeds compared to the mediocre IPC gains or it will be too costly using 3nm, then it is probably why they stick with 4nm.
According to Apple, N3 sucks. Great for efficiency, but no uplift in performance. Apple would know, they bought the entire run of N3. They had to use the efficiency gains to offset the lack of uplift to increase power to gain more clocks. They should have made M3 more efficient in their design and increased their IPC.
For servers, Turin which is based on N3. It will be just fine because servers run low clocks and are designed for super loads and efficiency.
The clock regression that Zen 5 was supposed to have was due to N3. The clock regression went away because Zen 5 is still based on the 5nm silicon. Albeit a much more advanced process for power and efficiency. Whether the next 3nm TSMC process will be N3P or an N3X that will bring even better efficiency and an uplift in performance. TSMC 3nm is way overpriced currently if you base it on return on investment based on price/efficiency/performance.
Meanwhile the Intel haters are either in denial or ignoring that 20A is right around the corner. 20A will put pressure on TSMC to execute better with their 3nm process. From what I see in the TSMC 3nm pipeline. A Zen 5+ next year on standard N3 looks like the only option. Consider that Intel said they would regain market leadership with 18A. By this I think they are saying they would put AMD and TSMC in their rear view mirror. I am not saying they are right. Intel was comparing 20A to Zen 5 being on N3 3nm TSMC which it will not be.
Let's just say the Arrow Lake CPU should be compared to the Alder Lake release. All new cores and design with a silicon node shrink for both architectures. Intel has never struggled with IPC gains when introducing a new core. We have not seen many Node shrinks from Intel over the years. I totally agree with people when you compared TSMC 7nm and 5nm to the Alder Lake 10nm which is terribly inefficient by comparison.
If any forum members can give us evidence or release notes for Zen 5 silicon, that would be great. It's either on N4, N4P or N4X. It matters what silicon AMD uses for the sake of performance and efficiency. Every since Zen 2, AMD has had an impressive silicon advantage. 7nm TSMC was great for the time. 5nm was very good but not as good considering how great 7nm was. I am not giving all your hope and dreams, gone. Never to be seen again for TSMC or AMD. I think maybe AMD and Nvidia should be asking for discounts from TSMC. Meanwhile, Intel is offering to sell silicon to AMD and others in the future.