We have said it many times, the jump to DDR5 in combination with PCI Express 5.0 requires profound changes in the internal circuitry of the new CPUs, these means the update on the one hand of all the circuitry dedicated to communication with the memory on the one hand and that of peripherals on the other. Which incidentally leads to the adoption of new sockets and chipsets by both Intel and AMD.
How many cores will AMD EPYC Genoa have?
The information is not official from AMD, but comes from AdoredTV. What do we know about AMD EPYC Genoa so far? Officially that it will be released in 2022 under the commercial name of AMD EPYC 7004 if we look at the road map of AMD itself that was leaked a few days ago, in addition to the confirmation that it will have more than 64 cores, so AMD will break that barrier
The new information? Well, we have two contradictory sources, on the one hand, the Executable Fix insider speaks of a 96-core configuration, while AdoredTV claims that the number of cores could go up to 128. At the moment we do not know which of the two is right and it will be AMD that has the last word.
At the moment in the AMD EPYC range the number of memory channels has always been proportional to the number of CCD chiplets, both in Zen 2 and Zen 3. We cannot forget that DDR5 is a dual channel memory and the famous 8 DDR4 memory channels are 16 channels in DDR5, hence possibly the 128 cores that AdoredTV claims. But we have to bear in mind that the information talks about 12 channels of DDR5 memory and not 16.
Let’s not forget that the coincidence between the number of RAM channels and the number of CCD Chiplets in the current AMD EPYC is nothing more than a coincidence, so it should not be confused as a causality for the number of cores of these processors.
What other news will AMD EPYC Genoa bring?
The most important is the adoption of Zen 4, which will come in CCD chiplets like Zen 2 and Zen 3 but built under the 5nm node of TSMC and with the improved architecture for offer increases in the CPI above 20%.
Another major change in Zen 4? The adoption of AVX-512 instruction set that so far are exclusive to Intel and have been key to certain contracts for this type of processors.
The only change that we are not going to see is in terms of the number of cores. what will continue to be 8 by CCD Chiplet, so the step to 5 nm will not be used to increase the number of nuclei, but to improve these. As for the adoption of a mixed architecture in the style of the CPUs with current ISA ARM or the imminent Alder Lake of Intel we will have to wait until Zen 5.