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Yes, well you're comparing silicon photolithography process nodes that are a decade apart and core architectures that are 5+ years apart, that's the difference.
by easygenes 5y ago
Yes, well you're comparing silicon photolithography process nodes that are a decade apart and core architectures that are 5+ years apart, that's the difference. The Pi 4 is using Cortex-A72 cores, released in 2016 [1]. And is made on the 28nm node, released in 2011 [2][3][4]. Compare that to the Snapdragon 888, which uses the 5nm node (and the low-power version of it, at that), and Cortex-X1 cores from 2020. That's where your difference comes from. It's like comparing a Pentium III to a Core i7.
The Pi is cost-optimized to hit an entry level price target of $35. They have to use old cores and cheap lithography processes. High-end smartphones are cost-optimized for a $700-1200 price window with massive economies of scale and stiff competition, so they will naturally use the latest process nodes and cores. It's completely apples and oranges.
Compare the RasPi to other sub-$100 SBCs and it compares quite favorably.
There are lots of reasons the 28nm node has such longevity, mostly coming down to the fact it is the last silicon process node which uses simple gate topographies and is thus highly cost-effective to produce. [5][6]
1: https://en.wikipedia.org/wiki/ARM_Cortex-A72
2: https://en.wikipedia.org/wiki/32_nm_process#28_nm_&_22_nm
3: https://www.tsmc.com/english/dedicatedFoundry/technology/logic/l_28nm
4: https://www.techinsights.com/blog/review-tsmc-28-nm-process-technology
5: https://arstechnica.com/gadgets/2021/04/chipmaker-says-it-will-ramp-up-production-of-older-28nm-chips/
6: https://omdia.tech.informa.com/OM016176/28nm-to-be-a-long-lived-node-for-semiconductor-applications-in-the-next-five-years