Based on what? Besides TSMC, nobody has made any formal announcements as to what N3B will be used for. And what TSMC said was that N3B will be used for smart phone and HPC chips, with nothing about PCs or tablets.
OTOH, there have been some rumours that Macs will wait for N3E.
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Gurman claims new M3 Macs will come in the fall, but that doesn't jive with the above rumours, and I personally don't believe they will be based off N3B either as there isn't really a great advantage for Apple to use it for Macs, esp. since these Macs get made for several years.. So that leaves N4P, which I don't think the M3 Macs will use either.
Apple is essentially saving TSMC's investment in N3B - otherwise the initial N3 family tooling would have been a total waste/disaster. Everyone else in the industry (AMD, Nvidia, Qualcomm, etc) is waiting for N3E, because its cheaper.
Apple will eventually release N3E products as well (starting in Fall 2024 with A18, 2025 for M4), but TSMC has given them a decent deal on N3B wafer pricing, because without it, N3B is basically irrelevant and would have yielded a financial loss for TSMC.
N3B Products -
iPhone 15 Pro + Max (September 2023)
Apple iMac (October 2023) + Macbook Air (October 2023) + Macbook 14/16 Pro (early 2024)
Mac Mini (Mid/Late 2024)
Mac Studio / Pro (Mid/Late 2024)
iPhone 16 - (September 2024)
N3E Products -
iPhone 16 Pro + Max (September 2024)
Apple iMac (early 2025) + Macbook Air (early 2025) + Macbook 14/16 Pro (Summer/Fall 2025)
Mac Mini (Late 2025 or early 2026)
Mac Studio / Pro (Mid/Late 2025 or early 2026)
N3B uses 26 EUV layers while N3E uses 19, from what I recall. Google Dylan Patel / Semi Analysis, he has done all the work on this.
N3E being cheaper makes sense for Macs, but it isn't just cheaper. It's also better. It also arrives in the fall in volume, which means Apple will begin receiving N3E chips in late 2023, with new Mac releases in early 2024.
The way I envision it:
N3B: A17 - iPhone 15 Pro in 2023, early 2024
N3E: A17 - iPhone 15 Pro in 2024, iPhone 16, iPads
N3E: A18 - iPhone 16 Pro, iPads
N3E: M3 series - Macs, iPads
N3B is basically just used to cover the initial batch of iPhones, and after that it is killed off.
I could very well be wrong, but I'll believe it when I see it. I'm just don't think people should
count on new M3 Macs in fall 2023. It could happen, but I'm not at all optimistic.
Maybe I've misunderstood your comment, but you seem to be conflating yield and performance. They're not the same thing. Yield is the number of good chips vs bad chips produced from a line, usually expressed as a %. If yield is low, the faulty chips are often discarded/recycled back into production, depending on fault, and this has two effects: overall per-unit cost of the chips increases, line efficiency decreases, so there can be insufficient devices to meet demand.
Yeah but you can mitigate yield issues to a certain extent by decreasing required performance thresholds. So it can affect performance in that regard.