Microsoft patch a small core AMD 64 128 threads Ripper 3990X release full of blood
AnandTech recently discovered a problem in the evaluation of AMD's thread Ripper 3990X: For the core 128 has 64 threads monster who, Windows 10 does not release its full performance potential, and different versions were mixed, under the Professional Pro performed significantly lower than the enterprise, enterprise Edition. Really true?
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According to Microsoft specifications, Windows 10 Professional Edition supports up to two-way, 128 processor cores, Windows 10 Enterprise Edition is up to four, 256, so they should be able to better support Ripper 3990X.
After However, AnandTech found in the test, Windows 10 by default Ripper 3990X divided into two groups, each group of 32 core 64 thread, that is, think of it as a two-way system, turn off the multi-threaded, 64-core 64-thread is Windows In order to identify a group.
We know that almost no desktop application optimized specifically for two-way done, Windows scheduler can not allocate thread well for them.
The core logic 128 is identified as the dual
After closing the one-way multithreading become
Meanwhile, under Windows 10 Enterprise Ripper 3990X performance significantly better than the professional version, in extreme cases even worse 8 times more, and then close the multi-threaded, but performance has generally improved, more than four times that in extreme cases.
Tom's Hareware听闻之后立即联系AMD，获得了官方回应：“对于线程撕裂者3990X，AMD官方推荐Windows 10专业版或者Linux系统。更高版本的Windows 10不会带来额外的性能提升或者兼容性改进。我们了解到有媒体认为(Windows 10不同版本的性能)存在差异，但我们认为这应该是测试有误，我们正在进行调查。”
随后，Tom's Hareware也进行了重新测试验证，结果发现无论专业版还是企业版Windows 10，撕裂者3990X的性能是完全一样的，绝大多数项目的差异不到0.3％，都在误差范围内，最极端的也不过1.25％，不足为虑。
同时，Windows 10无论专业版还是企业版，都没有把128个线程分成两路，而是完整的一路。
那么，AnandTech作为一家相当权威、专业的硬件媒体，到底哪里做错了呢？
查阅AMD官方提供的撕裂者3990X测试指南，可以发现开篇就特别强调了如何才能充分利用超过64个线程，第一条就是要求全新安装最新版本的Windows 10 x64，系统版本号至少是18362.535或者更高，尤其确保更新补丁KB4530684。
Tom's Hardware使用的Windows 10系统版本为18362.592，正好符合AMD的要求，AnandTech则没有透露系统版本，所以基本可以断定，AnandTech的系统版本稍老一些，至少没有更新补丁KB4530684，才导致了撕裂者3990X的“残血”。
不过查询微软知识库文章，KB4530684的更新日志里却没有提及这种优化，只能说微软也太低调了。
另外，AMD还强调，经过技术合作，很多常用的测试工具已经升级，可以支持64核心128线程，比如CineBench R20 20.06、POV-Ray 3.7，因此强烈建议使用最新版本的工具进行测试。