Monday, May 16th 2022
AMD Ryzen 7000 "Phoenix" APUs with RDNA3 Graphics to Rock Large 3D V-Cache
AMD's next-generation Ryzen 7000-series "Phoenix" mobile processors are all the rage these days. Bound for 2023, these chips feature a powerful iGPU based on the RDNA3 graphics architecture, with performance allegedly rivaling that of a GeForce RTX 3060 Laptop GPU—a popular performance-segment discrete GPU. What's more, AMD is also taking a swing at Intel in the CPU core-count game, by giving "Phoenix" a large number of "Zen 4" CPU cores. The secret ingredient pushing this combo, however, is a large cache.
AMD has used large caches to good effect both on its "Zen 3" processors, such as the Ryzen 7 5800X3D, where they're called 3D Vertical Cache (3D V-cache); as well as its Radeon RX 6000 discrete GPUs, where they're called Infinity Cache. The only known difference between the two is that the latter is fully on-die, while the former is stacked on top of existing silicon IP. It's being reported now, that "Phoenix" will indeed feature a stacked 3D V-cache.
The exact function of this isn't known—whether it serves as a last-level cache for the CPU or iGPU. AMD's APU architecture differs from Intel's processors that have iGPUs. On the Intel chips, the L3 cache serves as town-square for the entire SoC, with each IP block contributing an L3 cache slice that make up a functionally-contiguous cache that all IP blocks can equally address over the Ring Bus. On AMD APUs such as "Cezanne" or "Rembrandt," the L3 cache is part of the CCX (CPU cores complex), and serves exclusively as last-level cache for the CPU cores. The iGPU has its own LLC, and the Infinity Fabric interconnect is the ether binding all IP blocks on the silicon.
The obvious direction for development in future APUs could be a unification of last-level cache for the CCX and iGPU, provided the cache is large enough for the function—and this can be accomplished by stacked cache. An RDNA2 GPU with performance rivaling the RTX 3060 Laptop GPU, the Radeon RX 6650M XT, based on the "Navi 23" silicon, has 32 MB of Infinity Cache. This means, with some clever cache memory-management, an LLC size in the neighborhood of 64 MB could emerge feasible for the APU.
Source:
Greymon55 (Twitter)
AMD has used large caches to good effect both on its "Zen 3" processors, such as the Ryzen 7 5800X3D, where they're called 3D Vertical Cache (3D V-cache); as well as its Radeon RX 6000 discrete GPUs, where they're called Infinity Cache. The only known difference between the two is that the latter is fully on-die, while the former is stacked on top of existing silicon IP. It's being reported now, that "Phoenix" will indeed feature a stacked 3D V-cache.
The obvious direction for development in future APUs could be a unification of last-level cache for the CCX and iGPU, provided the cache is large enough for the function—and this can be accomplished by stacked cache. An RDNA2 GPU with performance rivaling the RTX 3060 Laptop GPU, the Radeon RX 6650M XT, based on the "Navi 23" silicon, has 32 MB of Infinity Cache. This means, with some clever cache memory-management, an LLC size in the neighborhood of 64 MB could emerge feasible for the APU.
45 Comments on AMD Ryzen 7000 "Phoenix" APUs with RDNA3 Graphics to Rock Large 3D V-Cache
This thing's gonna be expensive & unless they plan to use 3d cache for Ryzen 3 or below, not really a great alternative to combo of cheap (old?) dGPU & non IGP Ryzen 3 chips!Fast RAM always helps, though I'd argue more (dense) RAM is better than expensive fast RAM.
The 16 core 7373X is the slowest and the most insane model, with 8 chiplets, but only 2 cores active on each chiplet, for $4200. So, 75 % of all cores disabled, just to get 48 MB L3 cache per core.. I wouldn't be surprised if it's a typo. The 24 core is cheaper lol.
The Phoenix is single chip and pretty much can't end up anywhere else than in the reasonably priced consumer/client space.
unless the price difference is going to be $20 ish