Now that Zen 3 has been out for some time, one naturally wonders about AMD’s next-generation CPU architecture for the Ryzen and EPYC CPUs, i.e. Zen 4 carries. Latest rumors now say that there will be another huge IPC jump and massive performance increase over the current processors. The s latest rumor on this topic comes from ChipsandCheese, where their sources report that Genoa, AMD’s next-generation server family, will be significantly faster compared to AMD’s existing EPYC offerings.
According to this rumor, AMD’s Zen 4-core architecture will offer a truly huge leap in IPC. The sources report that existing Genoa engineering samples with the same number of cores and clocks as Milan CPUs are up to 29% faster. That’s really a huge jump, even considering the jump to Milan from Rome. The AMD Zen 4-core architecture will most likely be manufactured on TSMC’s 5nm process nodes and is expected to launch sometime in 2022.
The total performance increase for the Genoa CPUs could even be around 40%, considering that the CPUs will feature more than just a core architecture upgrade. There will be higher clock speeds and also major improvements to the IMC, along with support for faster DDR5 DIMMs and an improved interconnect fabric that communicates with the various cores. The Zen 4 CPUs are also expected to offer an even higher core count, which AMD’s CEO Dr. Lisa Su had hinted at in an earlier interview. It is expected that the EPYC Genoa CPUs of the 4. AMD expects the 3rd generation to have up to 96 cores, although the number could end up being even higher if AMD really wants to push the boundaries significantly in the server CPU segment.
There are also details at ChipsandCheese about Zen 3+ as an interim solution and first chip series supported by the brand new AM5 platform. We already know that Zen 3+ will act as a refresh of sorts and will be referred to internally as Warhol. Zen 3+ is expected to be manufactured in TSMC’s N7 process, but which will then use 5 layers of EUV. So while it’s not technically a new Node, it will offer a number of improvements. The source reports that one could expect nominal IPC gains of 4-7%, which alone is better than the 3% IPC gains that existed at Zen+ at the time.
Finally, for Zen 5, the information is based on a less reliable source, ChipsandCheese reports. These CPUs are expected to offer another massive IPC increase, which is expected to be 2.5-3 times the IPC of Zen 1. That looks like a huge goal, but given what AMD has achieved so far with Zen to Zen 3, nothing seems too impossible. Despite the good news, of course, all these rumors must be properly classified and taken with a grain of salt. But there’s probably some truth to it.