3 ms·

What's the SSEs and AVXs performance like on Ryzen/EPYC compared to intel?

• gcp 9y ago
  SSE performance is comparable, so is 128-bit AVX. 256-bit AVX is in theory half as fast. Despite this, apparently Ryzen beats Kaby Labe on SPECfp, so theorethical max throughput is only part of the story. It does not help that Intel needs to heavily reduce their boost speeds when using the full AVX unit.
  • TazeTSchnitzel 9y ago
    I wonder how the AVX situation will play out. Will 128-bit SIMD with more cores and higher clockspeed beat 256-bit?
  • AlphaSite 9y ago
    It's not actually half as fast, because these chips run a AVX at the full clock speed, rather than down clocking as Intel does.
    • Keyframe 9y ago
      So, any benchmarks regarding SSE and AVX out there yet?
      • oakridge 9y ago
        For the new AMD releases there's none yet, but for Ryzen 7 Phoronix did one comparison for code compiled with -mavx2 and Ryzen did really poorly. The other benchmarks which use more integer math or relies heavily in multithreading puts AMD in an advantage. The post was in 18 May 2017 and AMD may have released some microcode updates that nullifies the results. The review: http://www.phoronix.com/scan.php?page=article&item=ryzen-kabylake-may&num=6 http://www.phoronix.com/scan.php?page=article&item=ryzen-kab...