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Do they support AVX-512?

I don't think so. I think we are stuck with the SkyX and XeonW (whenever that becomes available) for AVX512.

The newest Xeons have a higher performance when you use AVX2 instead of AVX512 because of the low clock when using avx512 instructions (source in German: https://www.heise.de/ct/ausgabe/2017-20-Von-Suenden-Fehlern-... )

The first gen is usually slower and a prototype so software can get written. AVX2's scatter gather instructions were similarly slower initially.

yes

At least such a support is not listed on

(only AVX 2.0 is).

I think they confused Coffeelake with the new Skylakes