More details of amd epyc rome design architecture
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AMD continues to evolve its new Zen architecture. Yesterday, the company announced its new line of EPYC Rome server processors, offering up to 64 cores and 128 threads. This opens the possibility for AMD business customers to equip a single dual-socket motherboard with up to 128 cores and 256 threads.
AMD EPYC Rome are processors with 9 dies
The new processors are based on AMD's Zen 2 microarchitecture, and feature a revolutionary new “chiplet” ecosystem, in which a 14nm I / O die sits in the center of the processor, surrounded by eight chiplet modules of 7nm CPU. The chiplets are interconnected with the I / O die, through AMD's second-generation Infinity Fabric architecture. Each chiplet carries up to eight cores and 16 threads, so that the eight add up to a total of 64 cores.
We recommend reading our article on AMD presents the 7nm EPYC 'Rome' CPU with 64 cores and 128 threads
EPYC Rome processors are equipped with an eight-channel DDR4 memory controller, which is now located within the I / O die itself. Thanks to this improved design, a UMA architecture is obtained and each chiplet can access memory with the same latency. They are also the first processors to support the PCIe 4.0 standard and have up to 128 PCIe 4.0 lines, making them the ideal companion for Instinct MI60 and MI50 accelerators using the PCIe 4.0 x16 interface. However, AMD did not specify whether the PCIe complex resides within the I / O die.
This turns the EPYC Rome into processors with no less than nine silicon pads inside, if the first generation EPYC already impressed with its four pads, they do it even more. Intel was laughing that the EPYC were four processors glued together, AMD has chosen to solve the weaknesses of this design by adding even more modules to the processor, we will see the face that remains for Intel as it manages to overcome its monolithic Xeon.
AMD has not disclosed prices and availability for the EPYC Rome line. However, the processors are expected to be released in 2019, assuming there are no major setbacks.
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