Core i7 7740X与Core i9 7900X评测预告

jerrytsao · 发表于 2017-7-3 14:33

本帖最后由 jerrytsao 于 2017-7-3 14:36 编辑

SKL-X的AVX512是Full Throughput还是Half Throughput?

另外AVX512民用究竟有多大意义? Numberworld之前做的Knights Landing测试显示AVX2->AVX512实际Scaling效率很低, 视频转码软件真的会大面积应用?

jerrytsao · 发表于 2017-7-3 16:36

本帖最后由 jerrytsao 于 2017-7-3 16:42 编辑

royalk 发表于 2017-7-3 15:25
Anandtech是这么说的

也就是说i9=Full, i7=Half, i7来个PCIe+AVX双阉割来Justify降价, 牙膏厂刀法和老黄有的一拼

jerrytsao · 发表于 2017-7-4 14:02

本帖最后由 jerrytsao 于 2017-7-4 14:06 编辑

chungexcy 发表于 2017-7-4 13:56
对了，要是方便的话，帮我测一下waifu2x在7900x上的表现吧，我想看看这个15年11月的软件优化，能不能用好4 ...

y-cruncher应该快了, 硬件到位就有了

Development on AVX512 began in 2014. And as of 2016, most of the work that could be done without the hardware has been completed.

Internally, there are currently 3 binaries with AVX512. But none of them are enabled publicly yet.
16-KNL (Knights Landing)
17-SKX (Skylake Purley)
18-CNL (Cannonlake)
All of these are working and tested through emulation on both Windows and Linux. What's needed now is the actual hardware for final testing and performance tuning. So there's a lot of AVX512 code that's been sitting around while we wait for the hardware.

As of June 2017, the first line of Skylake X processors are around the corner. But due to conflicting rumors and leaked benchmarks, it is unclear whether this first line of SKylake X processors will have full-throughput AVX512 or only half-throughput. If they don't have the full-throughput AVX512, it's quite possible that y-cruncher's AVX512 support will not be ready until 2018.