A support document for AMD's next server socket SP5 also reveals details about Zen 4: 12 CPU dies including AVX-512 are offered, which is what the previous rumors of up to 96 are up to now feeds a maximum of 64 cores in the processors with the code name Genoa. The twelve-channel memory interface is also mentioned.
Information from the gigabyte hack
AMD's support document in revision 0.71 from July 2021 describes a variety of technical details and should be authentic, they come from the gigabyte hack with extensive data leak of the past few weeks, a first, small portion of which has now been published.
According to the document, the upcoming processors – as already suspected – will continue to be based on eight-core CPU dies, and the I/O die will once again take over the functions of communicating with each other and with the outside world. The size of the CPU chip, which is manufactured in 5 nm instead of 7 nm, does not change much; according to the document, it should be around 72 mm² in size. The I/O die is 397 mm². The larger SP5 package will, however, allow the arrangement of six CPU dies per side in the future. Up to now a maximum of 8 chips with 8 cores and thus a total of 64 cores were possible.
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AMD Zen 4 for 96-core CPU Genoa (Image: Twitter)
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AMD Zen 4 for 96-core CPU Genoa 
AMD Zen 4 – details on the dimensions of CPU and I/O die 
AMD Zen 4 for servers 
AMD Zen 4 for servers The fact that the processor core is not getting smaller, although the manufacturing stage at TSMC changes from 7 to 5 nm, is due to new features such as the first AVX-512 in AMD's processors. The area of the I/O die is ultimately not changed much either, although the number of memory controllers in the server area has increased by 50 percent from eight to twelve. Twelve channels in turn fit exactly to the twelve CPU dies that are installed for this market.
AMD Zen 4 will support AVX-512 (Image: Twitter) 
AMD Genoa with Zen 4 offers twelve storage channels in the server (Image: Twitter) 
AMD Zen 4 CPU-Die (Image: Twitter) That 96 The support documents for the large SP5 socket with its 6,096 contact surfaces also show that cores with new features and a large memory interface will ultimately also consume electrical power. The TDP is likely to continue to rise, as it did last – up to 400 watts were recently discussed. The peak loads will in any case be higher than before: The new processors for the SP5 socket can use up to 700 watts for a very short time.
AMD Genoa with Zen 4 can consume a lot of power (Image: Twitter) AMD's Zen- 4 architecture as well as the Genoa processors are expected in 2022. AMD recently always officially spoke of the introduction of 5 nm processors with a new architecture by the end of 2022.