July 16, 2017

Zeppelin (Ryzen) I/O capabilities

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The Zeppelin die currently the only die using the Zen processor. Ryzen 3/5/7 contains one Zeppelin die, Ryzen Threadripper contains two, and EPYC contains four. Here is what I have been able to piece together about the I/O capabilities of the chip:

The Zeppelin die supports 32 PCIe lanes, in two groups of 16.

It is not clear to what extent these groups can be subdivided. One group can be subdivided into at least 8/8. The ability to subdivide this group is disabled on Ryzen 3/5/7 unless…

Zeppelin (Ryzen) I/O capabilities

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