Intel Arrow Lake-S CPU spotted with 24 threads, no Hyper Threading and AVX512 support

Intel Arrow Lake-S with no hyper threading

More evidence surfaces claiming that Intel’s next-generation client CPU series will not support hyper threading.

Hyper Threading, is a simultaneous multithreading technology that allows physical cores in Intel CPUs to perform two tasks at the same time, effectively acting as two logical cores. Intel introduced hyper threading in 2002 with its Xeon architecture. Upon its release, the consumer Core & Core 2 did not support this technology, but Intel eventually reintroduced this technology with Core i7 Nehalem microarchitecture in 2008. It appears that hyper threading may disappear from Intel Core CPUs once again.

Intel already introduced some changes to its Core CPU that limit hyper threading. The so-called Efficient cores (E-Cores) now present in the vast majority of Intel Core 12/13/14 CPUs, do not support HT. For this reason, defining the specs for each SKU is a real headache, especially now with the fastest CPU cores called Meteor Lake, which also introduce a third core type called LP-core located in the SoC die. Neither E-Core nor LP-Core support HT, and judging from the latest leaks, the next-gen P-Core will not support HT either.

Arrow Lake-S without HT, Source: YuuKi_AnS & InstaLaX64

The rumors started with slides leaked by YuuKi_AnS, which mentioned 8 IA cores and 8 threads, while it should have said 16 threads instead. These slides focus on Arrow Lake-S architecture (where S stands for desktop), based on MTL-S (Meteor Lake) platform. The new series is expected to launch in various configurations, featuring: 8P + 16E, 6P + 16E or 6P + 8E cores.

This rumor has now been supported by another leak from InstaLaX64, who spotted Arrow Lake-S CPU with 24 threads. If this was a 8P+16E core configuration, this output would have shown 32 threads instead.

It appears that Intel’s next-gen client series, the first to launch under the new Core Ultra branding, will not have hyper threading after all. What’s worth noting is that AMD’s Zen4 (classic) and Zen4c (dense) design does not limit hyper threading to the ‘classic’ cores. It is however not clear what will happen with future AMD microarchitectures, and whether they will continue to support multi-threading.

The leak from InstaLaX64 also mentions that the current engineering sample runs at 3 GHz and there is no support for AVX512 instructions.

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