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本帖最后由 午夜幽骑王 于 2021-2-23 14:00 编辑
在上周的ISSCC（国际固态电路会议）上，微软发表了名为“ Xbox Series X SoC”的演讲，Anandtech进行了跟踪分析，https://www.anandtech.com/show/1 ... and-yield-tradeoffs
性能没怎么提，来看看功耗发热和噪音。
从微软官方的热成像图来看，XSX的CPU比GPU发热点高了7度，并且CPU发热高度集中在内核对应的几个小点上（7nm Zen2的积热名不虚传）。
回想马克塞尼在技术直面会上说的，PS5大幅拉高GPU频率，除了性能考虑，还可以均衡硅片的发热，避免CPU那头因热密度太高积热。
现在看看XSX这个SoC发热情况，马克塞尼果然是有道理的。
而在噪音的贡献上，XSX的CPU每增加1W功耗，付出的噪音成本是GPU的五倍。（原文：every additional Watt the CPU uses is worth five times more to the acoustic budget than the GPU.）
（怎么越来越像是在替PS5说话呢……）
人间迷惑之“微软讲自家产品设计，从头到尾都像是在夸对手英明”
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微软为实现12T浮点性能，测试了52CU@1.825GHz和56CU@1.675GHz两个方案，测试结果是，52CU@1.825GHz的功耗比56CU@1.675GHz高20%，但鉴于保证56CU全好的生产难度带来的良率成本，微软最终选择了52CU@1.825GHz
原文：
Paul Paternoster explained that from chips coming off the production line, a substantial number could run with all 28 WGPs enabled. The goal of the graphics was to provide 12 TFLOPs of performance, and so by some simple math, Microsoft could do either of the following to hit that number:
28 WGPs enabled at 1675 MHz
26 WGPs enabled at 1825 MHz
Both of these configurations enable 12 TFLOPs. Because the frequency of the 28 WGP design is lower, this also enables a lower voltage, combined for an overall power saving of 20% if all 28 WGPs are used.
Of course, a 20% power saving is quite substantial, as it would either enable better performance per watt, or enable higher performance. But the issue is that not enough processors were coming off of the production line with all 28 WGP running at this frequency. The variability of the processors, due to both transistor performance and defects, meant that 28 WGP versions didn’t make sense financially.
从56CU@1.675GHz到52CU@1.825GHz，CU少了4个（少了7.7%），频率提升150MHz（提升了9%），功耗就涨了20%？微软，你这能耗比真的是“真·RDNA2”吗？ |
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楼主
发表于 2021-2-23 10:37 · 安徽
