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Any thoughts on the huge discrepancy in SSE performance? Something seems wrong there.

• TazeTSchnitzel 10y ago
  As mentioned elsewhere, these chips only have a 128-bit SIMD unit (either for power or for space savings?) and so 256-bit SIMD executes half as fast as it would on Intel.
  • acqq 10y ago
    But if I read the picture properly, AMD appears to be 8 times(!) faster than anything else: http://cdn.wccftech.com/wp-content/uploads/2017/02/AMD-Ryzen-7-1800X-CPU-Mark-SSE-Benchmark-WM-840x370.jpg http://cdn.wccftech.com/wp-content/uploads/2017/02/AMD-Ryzen... That seems to be untypically good, in the market where the new generations brought typically 10-20%. I still wouldn't say it's impossible, as, for example, Intel had (apparently until Sandy Bridge) much slower NaN handling than AMD, at least without SSE2. So maybe AMD discovered some weak point like that. But until I read some explanation, it does seem to be too good...
    • TazeTSchnitzel 10y ago
      Ah. Yeah, that looks impossible.