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Intel's “Cripple AMD” Function
- dr_zoidberg 7y agoFor these kind of stuff it was particularly shocking (or telling of the raw power Zen 2 achieves) that AMD Epycs surpassed Intel in one of their own benchmarks this year.
- BubRoss 7y agoThis is a message board thread from 2009 FYI.
- Phylter 7y agoThere is a recent post discussing the idea that AMD Phenom processors are unfairly disadvantaged because they do not support SSE3 and modern games are targeting SSE3/4.2. I think that's what this post it trying to point out. I really don't see any modern relevance to this post though since modern AMD processors support these instructions. I'd still be curious to know if Intel is doing this though. I guess there are some other Ryzen related conversations too that are relevant.
- flyingfences 7y ago> modern AMD processors support these instructions ... and that's the whole point of the post. AMD CPUs support the instructions, but Intel's compiler ignores that support on non-Intel processors.
- deleted 7y ago[deleted]
- ncmncm 7y agoThere is a useful recent note, toward the end, about an environment variable that, apparently, may be set when running a program built with Intel's compiler, and that will enable the program to run at full speed on an AMD cpu.
- tracker1 7y agoNot sure if it's still the case... would be interesting to see a post-compiler tool that bypasses the GenuineIntel checks for certain cases.
- flyingfences 7y agoIntel is still doing it [1], at least in some of their libraries. [1] https://www.extremetech.com/computing/302650-how-to-bypass-matlab-cripple-amd-ryzen-threadripper-cpus https://www.extremetech.com/computing/302650-how-to-bypass-m...
- skunkworker 7y agoIt's interesting how this is still a major issue today, Last month I learned about the Matlab AMD crippling issue. With the workaround AMD performance on a 3960x increased by 30%. "[...] the Intel MKL uses a discriminative CPU Dispatcher that does not use efficient codepath according to SIMD support by the CPU, but based on the result of a vendor string query. If the CPU is from AMD, the MKL does not use SSE3-SSE4 or AVX1/2 extensions but falls back to SSE1 no matter whether the AMD CPU supports more efficient SIMD extensions like AVX2 or not." https://www.extremetech.com/computing/302650-how-to-bypass-matlab-cripple-amd-ryzen-threadripper-cpus https://www.extremetech.com/computing/302650-how-to-bypass-m... https://www.reddit.com/r/Amd/comments/e24jqp/extremetech_how_to_bypass_matlabs_cripple_amd_cpu/ https://www.reddit.com/r/Amd/comments/e24jqp/extremetech_how...
- colejohnson66 7y agoWasn’t there a lawsuit about the ICC doing this a few years ago?
- downerending 7y ago"Windows ain't done 'til Lotus won't run."