alt Hacker NewsThe performance with LNL is not apples-to-apples, like the comparison with Arrow Lake H.
LNL has a much lower power consumption in the memory interface, like the Apple CPUs, which has nothing to do with the fabrication process. Also LNL is a lower performance CPU, for which it is normal to have better energy efficiency.
Only the comparison between Panther Lake and Arrow Lake H, which have equivalent structures, can be used to compare the Intel 18A and the TSMC 3-nm fabrication processes.
This comparison shows that Intel 18A ensures a better performance per watt, i.e. energy efficiency, which leads to a better multithreaded performance, but the TSMC 3-nm process, at least for now, allows higher maximum clock frequencies, which make possible a higher single-thread performance.
On-package memory disproportionately affect idle power more than load power. The benchmark was done with Cinebench 2024 which is a heavy load test. Therefore, LNL's on package memory would have made little to no difference overall to perf/watt in Cinebench 2024 ST.
Panther Lake uses a new core design which likely contributed to better perf/watt regardless of which node was used. For example, Zen3 had a 19% increase in IPC despite being on the same N7 family node as Zen2. Panther Lake has 3 tiers of cores instead of 2 in Arrow Lake. The MT design is very different. New core and layout designs can make a huge difference in efficiency on the same node. We should compare ST perf/watt instead of MT. MT has too many factors including core count, die size, transistor count, clock speed.Based on ST perf/watt, Intel 18A is likely a bit worse than N3B (2022 node) and a bit better than N4P (2021 node).