There are no secrets to the AMD Zen4 architecture and CCD computing kernel design, but the auxiliary IOD I/O kernel has been a mystery.

Until the recent IEEE ISSCC International Solid-State Circuits Conference, AMD finally unveiled its mystery.

AMD Zen4 processor No matter consumer Ryzen, or server grade Skylon, CCD part is Taiwan Semiconductor 5nm technology, up to 8 cores.

Among them, Ryzen has 1-2 CCD, the core number of 6-16; Skylon has 2-12 CCDS and 16-96 cores.

Iods are all 6nm processes made by Taiwan Semiconductor, but Ryzen and Skylon are completely different.

Ryzen here measures only 12.4x9.5 = 117.8 square millimeters, about 3.37 billion transistors.

Xiao Long's is 24.8×15.6 = 386.88 square millimetersIs twice as long and two-thirds as wide, making it almost 2.3 times larger overall,There are about 11 billion transistors, also nearly 2.3 times more.

Including CCD and IODs, the Zen4 Ryzen has a maximum of 16.5 billion transistors, while the Skylon has a whopping 90.2 billion!

Intel Sapphire Rapids Xeon 4 doesn't say how many transistors it has, but it's certainly not this many.

In addition, Locuza_ also provided locuza_ IOD detailed layout chart annotations, you can seeIt only has two groups of GMI3/IFOP3 interconnection ports, that is, it can only connect up to 2 CCD, up to 16 cores, it is impossible to exist the legendary 3 CCD, 24 cores.

DDR5 memory controllers are two 40-bit sets, where 32-bit is used for memory and 8-bit is used for ECC verification and error correction.

That said, all Ryzen 7000 processors will support DDR5 ECC, but it's up to the motherboard manufacturer to enable it.

Naturally, the largest area in IODs is GPU correlationAlthough there are only two sets of CU units and 128 cores, there are display units, codec units and so on.

The others are PCIe 5.0 controllers, IO input/output units, power management, security controllers, audio DSPS, and so on.