AMD’s Zen 4 I/O Die Detailed Courtesy of ISSCC Presentation
If you’re wondering about the 2x 40-bit memory interface, it’s for ECC memory support outside of the on-die ECC support of DDR5 memory. Also note that DDR5 memory is two times 32-bit in non ECC mode. That said, it’s up to the motherboard makers to implement support for ECC memory, but it would appear all Zen 4 CPUs support it. The addition of a GPU, even a basic one like this, takes up a fair bit of space inside the cIOD, especially once you add things like video decoders/encoders and so on. In fact, it appears that the parts related to the GPU and video decoders/encoders take up at least a third of the space inside the I/O die, yet thanks to a significant die shrink from the Zen 3 era cIOD, it’s physically smaller in the Zen 4 processors, while having an estimated 58 percent increase in transistors.
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