AMD EPYC Rome with 7nm silicon, 14nm silicon and 128 PCIe 4.0 lines
The AMD EPYC Rome are monolithic processors that combine 7nm cores with a silicon for the I / O based on 14nm.
Yesterday after the AMD New Horizon conference we already talked a little about the company's plans for the future. The conference focused mainly on Zen 2 @ 7nm for the EPYC Rome and Vega 20 @ 7nm for Radeon Instinct MI60, all aimed at the professional sector. The data that was given yesterday and the internal structure of the EPYC Rome suggested a 64-core processor with 128 processing threads, but these processors support dual socket motherboards allowing a configuration of 128 cores and 256 processing threads. .
Two AMD EPYC Rome on a single motherboard to get 128 cores and 256 threads.
The 7nm process, despite being complete, is still very green and expensive, for this reason AMD has developed a special system where Zen 2 @ 7nm silicons will be mixed with a 14nm I / O silicon that will be found in the center processor and will be flanked by a chiplet system. These chiplets will be connected to the I / O silicon through the renewed Infinity Fabric architecture that will reduce latencies and increase bandwidth.
According to what we know, each chiplet can be made up of two CCX modules with four cores each and eight threads, allowing eight cores and sixteen threads to be added to a single chiplet. The processor board will support eight of these chiplets that will allow up to 64 cores per processor.
Additionally Rome will have eight channel RAM memory support integrated into the silicon I / O. For this, the UMA architecture has been used, which allows each chiplet to access the memory with the same latency. Additionally, these processors will have support for PCIe 4.0, with a total of 128 PCIe 4.0 lanes, especially thinking about the Radeon Instinct MI60 and MI50, the first to integrate a PCIe 4.0 x16 interface.
It should be noted that we have eight chiplets based on 7nm plus another additional silicon of gigantic proportions based on 14nm, which adds up to a total of nine silicons in a single package. It remains to be seen how all this will affect in terms of consumption, since 14nm consume more than 7nm and we will also see how this affects temperatures.
