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The laptop chips have never had "downclocking problems" in the sense that Skylake-SP did. AFAIK they are actually some of the top performers for ps3 emulation/
by paulmd 4y ago
The laptop chips have never had "downclocking problems" in the sense that Skylake-SP did. AFAIK they are actually some of the top performers for ps3 emulation/etc.
https://travisdowns.github.io/blog/2020/08/19/icl-avx512-freq.html https://travisdowns.github.io/blog/2020/08/19/icl-avx512-fre...
Actually supposedly Skylake-X/Xeon-W had much lower AVX downclocking than Skylake-SP too... InstLat64 made a tweet at one point showing this was 10-20% for workstation vs 30-40% for server iirc. Tweet has been removed unfortunately.
Intel really throttled it down on server chips, for whatever reason. Probably didn't want datacenter chips to run the Unlimited Voltage that was necessary for full-clock dual-unit AVX-512 on 14nm.
- celrod 4y agoYou can configure throttling in the bios if you have Skylake-X. You can set it to whatever you want. The caveat being it won't necessarily be stable (depending on voltage) nor will your cooling necessarily be able to handle it. My 10980XE runs AVX2 at 4.2 GHz all core, and AVX512 at 4GHz.
- janwas 4y agoIt depends on the CPU type (bronze/silver < gold/platinum). My workstation saw 1.4-1.6x end to end application speedups, including throttling (even on multiple cores) for JPEG XL decoding and vqsort. [ General observation, not directed at parent comment: ] Frequency throttling, even on the most affected Skylakes, has always been a non-issue if you run say 1ms worth of continuous SIMD instructions. How could a 10-40% drop negate speedups from 2x vector width plus double the registers and a much more capable instruction set? It is time we buried this myth :)