@dysfun @gsuberland
Except that the cache is still on the AMD processor chiplet. They package contains n processor chiplets, and 1 chiplet with DDR memory controllers, PCIe interfaces, and GPU.
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@brouhaha @dysfun @gsuberland Probably thinking of 3D V-Cache?
That's still the same process node as the CPUs though, as far as I can tell (or at some point it was).
@lina @dysfun @gsuberland
The X3D is L3 cache in a 7nm node, in addition to the fairly-respectably sized CCD on-die L1 and L2 caches in 5nm or 4nm nodes.
In 2006, AMD licensed "Z-RAM" technology for a so-called 1T SRAM (of course, actually DRAM) for cache use, but never used it in production. The L1, L2, and X3D caches are all 6T SRAM.
@brouhaha @dysfun @gsuberland Ah, the first ref I found said everything is 7nm, but I guess that was just the first generation.
One thing that *is* true is that a pure SRAM die needs way fewer metal layers than a CPU die, even if the process node is the same.
