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Xbox series X processor complete architecture announcement: reserve two sets of GPU units

via:博客园     time:2020/8/19 12:19:44     readed:762

Sony ps5 and Microsoft Xbox series X are equipped with SOC processors jointly designed with AMD, and the specifications and parameters are basically no secret. At the hotchips 2020 conference, Microsoft announced the detailed architecture design and technical features of Xbox series X processor.

First of all, Microsoft summarized and emphasized many innovations of Xbox series X new processor and new host: 3.8ghz zen2 server level CPU core, sampling feedback stream (SFS), ray tracing (DXR), variable coloring rate (VRS), machine learning acceleration, D3D grid coloring, gddr6 video memory, Xbox velocity storage architecture, opus audio decoding, high quality sampling rate conversion, acoustics acceleration, 8K Output, HDMI 2.1, variable refresh rate, 120Hz refresh rate support, linear ray display processing, etc.

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The SoC processor was jointly developed by Microsoft Joint AMD and is manufactured using TSMC 7 nm enhanced version, integrating 15.3 billion transistors with a core area of 360.4 square millimeters ,12 layers of substrate ,2963- ball BGA package area of 52.5

In contrast, the processor of Xbox one X is still TSMC 16nm process, with a core area of 367mm2, but only 660 million transistors, a 1.3-fold increase.

Further on, the Xbox one s processor is also 16 nm, with only 5.4 billion transistors and 237 square mm, while the Xbox one is 28 nm, 4.8 billion transistors and 375 square mm.

Microsoft also admits that it is more and more expensive to design a SoC processor. In order to promote Moore's law, Microsoft and AMD improve the hardware design, and add hardware accelerator to save chip area and reduce power consumption.

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Xbox

The Xbox series X processor integrates eight Zen 2 architecture CPU cores, with the main frequency of 3.8ghz, and 3.66ghz after multithreading,Each core has 512KB secondary cache, with a total of 4MB. At the same time, every four cores share 4MB level-3 cache, with a total of 8MB.

Gddr6 memory has up to 20 channelsThe equivalent frequency is 14ghz, and the bit width is 320 bit, which means that the bandwidth is up to 560gb / s.

However, Microsoft has not explained why it is an asymmetric specification, because only 10GB of bandwidth is full 560gb / s, and the other 6GB is only 336gb / s.

In addition, I / O partially confirmedSupport for PCIe 4.0, but only 8 channels are provided.

Between CPU、GPU、I/O、GDDR6 and other modules Unified elastic data structure bus connection.

Xbox

Let's talk about GPU alone,Microsoft has confirmed that only 26 sets of dual computing units (equivalent to 52 sets of traditional CUS) have been opened, with a total of 3328 stream processors. In other words, there are still two groups of dual computing units that are not enabled. In other words, 28 sets of dual computing units have been designed, with a total of 3584 stream processors. I don't know when it will be full.

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Xbox

GPU supports dx12 ultimate and DXR hardware ray tracing. The peak processing capacity of ray box is 380g / s, and that of ray tri is 95g / s.

Microsoft's Xbox can say3-10 times faster ray tracing hardware, but only consumes a very small chip area.

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