3D vertical stacking for CPU cache

Although, curiously, Lisa Su didn’t declare an official identify for this new microarchitecture, the neighborhood has already christened it Zen 3+. It is true that the information about it’s minimal and really clear, that there is no such thing as a obvious restructuring or again finish or entrance finish, however the fact is that efficiency has elevated lots in a key part of this vary of processors: efficiency in video games.

AMD Zen 3+, now the CPUs combine SRAM in every CCD

That AMD has been working with TSMC for over a 12 months and its vertical stacking know-how is one thing we already knew about. AMD itself spoke of it on the time and introduced it as an enchancment that may come to its EPYC processors. What we couldn’t suppose so simply is that these wouldn’t be the primary to obtain it, however the CPUs of the mainstream vary for video games that may profit within the first occasion.


To do that, AMD has promoted vertical stacking know-how 3D V-Cache which in flip begins from TSMC’s 3D Fabric know-how, that’s, we now have 3D chiplets, within the purest Intel Foveros fashion, however utilized in a really particular and extra primary means.

The particular identify of the know-how at AMD is X3D, which was decided as a hybrid between the present 2.5D and actual 3D, and the one factor actually new is exactly the inclusion of further cache between the CCDs.

The firm has inserted a 64 MB cache reminiscence as SRAM in an higher layer and on these CCDs, in order that now the chiplets have entry to not 32 MB, however to 96MB L3 cache in complete of which the brand new 64 are off the die and vertically overlapped in a separate die.

More than 2 TB / s of bandwidth on L3

AMD-Zen-3 +

This makes efficiency skyrocket with hardly any enhance in design and manufacturing prices, as structure has hardly needed to be touched whereas efficiency has skyrocketed. AMD talks about 2 TB / s in L3, which signifies that now and for the primary time on a chip, the higher-level reminiscence is quicker than the lower-level reminiscence, though with greater latency, in fact.

This in keeping with AMD boosts efficiency by a shocking fifteen% common in video games, which might give it the management in gaming once more with the brand new Ryzen 6000. Logically, compatibility is assured for the AM4 socket and the chipsets that accompany it, so we are going to solely need to replace BIOS / UEFI and alter the processor to enhance efficiency.

On the opposite hand, AMD has not made statements about these new CPUs, frequencies, consumption or costs, so we should wait till the tip of this 12 months to see them in motion.