AMD has teased its 3D V-Cache know-how for a number of months, culminating within the reveal of the Ryzen 7 5800X3D on the firm’s CES 2022 keynote again in early January. Quick ahead to right now, and AMD has revealed some additional technical particulars behind its design on the Worldwide Strong-State Circuits Convention (through Hardwareluxx).
The AMD Ryzen 7 5800X3D is about to be the primary consumer-level processor to incorporate a further stacked cache. It is bleeding edge stuff.
Every Zen 3 chiplet accommodates 32MB of L3 cache which is shared amongst all the eight on-die cores. In the course of the planning part of Zen 3, AMD designed it in order that additional cache may very well be stacked with no basic redesign, not not like constructing a single story home with the structural integrity so as to add a second story comparatively merely.
A Zen 3 chiplet with its built-in 32MB of L3 cache may be expanded as much as 96MB, by including 64MB of stacked SRAM. The stacked cache chip measures simply 41mm² and is hooked up through copper bonding, subsequently skipping the extra difficult step of requiring soldering.
The 3D V-Cache is made up of a number of 8 MB “slices” with 1024 contact factors for every slice. Eight such slices imply there are 8192 contact factors between the V-Cache and the underlying CCD. This delivers a bandwidth of past 2 TB/s which is partucularly spectacular given the cache is just not on the die itself.
AMD has needed to tweak the underlying chiplets with the intention to match the additional Z peak inside the identical kind issue as a daily 5000 sequence CPU. AMD has additionally needed to skinny the CCDs and make tweaks to cater for the elevated thermal dissipation that is to be anticipated from a stacked design.
Warmth and TDP considerations are the principle purpose we’ll solely be seeing a 5800X3D and never a 5900X3D or 5950X3D. AMD must preserve the 5800X3D inside a 105W TDP (or 142W peak). Including cache to the upper core rely fashions would both break that quantity resulting in integration points, or require downclocking. AMD additionally says that an eight core CPU is the present gaming candy spot, making the 5800X the pure option to obtain the V-Cache remedy.
In keeping with AMD, that the additional L3 cache can ship as much as 15% extra gaming efficiency than the bottom 5800X. Which may be sufficient to see it pull forward of a 12900K is a few video games, at the least these which might be delicate to low latency cache. For all of the technological wizardry contained in the 580X3D, there’s the chance that it’ll end up being a low volume chip. We hope to get our keen arms on a 5800X3D when the time comes.