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【x264+Avisynth】実用エンコベンチ Part5.1 [無断転載禁止]©2ch.net

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2016/12/24(土) 17:27:59.97 ID:EkX2J8zn
>>199

>A key improvement in Skylake is the internal ring bus, which has double the memory bandwidth of the previous CPU generation (Haswell/Broadwell).
>The internal ring moves data inside the CPU, from cache memory to logic units in each core, and back again.
>Our performance profiling shows that x265 performance is often constrained by the memory bandwidth of Haswell generation cores which is about 20 GB/sec.
>Skylake cores have about 40 GB/sec bandwidth, removing this bottleneck.

>For 4K encoding on a quad-core desktop, we see a memory bandwidth bottleneck on Haswell processors with our fastest presets (ultrafast, superfast).
>Under this condition, Skylake can outperform Haswell by more than 2x.

開発者曰くSkylakeでメモリ帯域のボトルネックが改善されたのが大きいとか
4K動画を軽いプリセットでエンコする時は特に有効とのこと
241KB

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