As Zen 4 is expected to release later this year, rumors and leaks about the upcoming architecture have become more frequent. According to the latest reports, the Zen 4 chips will provide a significant increase in IPC compared to Zen 3, as well as higher clock speeds.
Starting from the Petykemano benchmark , here we see an AMD 8C/16T chip clocked at 5.21GHz running on the Splinter-RPL AM5 reference platform. The benchmark data doesn’t clearly indicate that we’re seeing a Zen 4 processor (Ryzen 7000 series), but matching the OPN code to the old data suggests it’s such a chip.
The data contained in the entry also shows that the iGPU (RDNA2) of the chip has been tested, giving us an early idea of its performance and ID (GFX1036). Comparing benchmark results, the iGPU performed similarly to Vega/Xe-LP based graphics, but we believe the iGPU did not perform at full speed.
Moore’s Law is Dead also shared some of the new rumors he got from his sources. According to his data, clock speeds can increase by 8-14%, which corresponds to the 5.2 GHz that we saw in the benchmark record. In addition, the youtuber also mentioned that we could benefit from a 15-24% increase in IPC. Together, these improvements will result in a 28-37% performance improvement for single-threaded applications.
Other Zen 4 consumer chip improvements may include 1MB L2 cache per core (2x that of Zen 3), more PCIe lanes, PCIe 5.0 and LPDDR5/DDR5 memory support, and improved AVX-512 performance (at the level of Ice Lake-X). However, the number of cores should remain the same, as should the amount of L3 cache that each core has.
The first products to use Zen 4 will be the Ryzen 7000 series desktop processors, currently expected in late 2022. AMD could also release the first Zen 4 server processors in the fourth quarter, followed by Threadripper in the first half of 2023.
Following Zen 4, we should get Zen 4c, a stepping stone to Zen 5. This architecture should only be relevant in the server market, and Bergamo is rumored to be the only platform based on it. Like Storm Peak, it is rumored to be released in the first half of 2023 and will feature up to 128 cores, a 12-channel memory controller, up to 400W TDP, and SDCI/SDCX accelerators on IOD. Also, there is a possibility that it will be an AMD architecture with 16-core CCDs, but the cache size can be halved compared to Zen 4. Genoa-X is also possible later (mid-2023), but there is little about this what is known.
Looking ahead, Zen 5 is expected to arrive a little over a year after Zen 4 with a redesigned data structure and cache configuration, and a newer TSMC N3 or N4P node, which could result in even more IPC gains. In addition, we may also see an increase in the number of cores, several accelerators in the product stack, and perhaps a slight increase in clock speed.
As part of the Zen 5 line, we are likely to get the EPYC Turin series, a server platform using tile architecture with up to 256 cores, an upgraded DMA engine, new accelerators, and 600W TDP SKUs. Turin is expected to be a product of late 2023.
We should be getting Zen 6 by 2025. We are still far from revealing any important information, but early rumors claim there will be a new cache configuration and HBM could be used on certain Zen 6 chips.