[morei]

L3 is almost never SRAM, it's usually eDRAM and clocked significantly lower than L1 or L2.

(SRAM is prohibitively expensive to do at scale due to die area required).

Edit: Nope, I'm wrong. It's pretty much only Power that has this.

[dragontamer]

As far as I'm aware, IBM is one of the few chip-designers who have eDRAM capabilities.

IBM has eDRAM on a number of chips in varying capacities, but... its difficult for me to think of Intel, AMD, Apple, ARM, or other chips that have eDRAM of any kind.

Intel had one: the eDRAM "Crystalwell" chip, but that is seemingly a one-off and never attempted again. Even then, this was a 2nd die that was "glued" onto the main chip, and not like IBM's truly eDRAM (embedded into the same process).

[morei]

You're right. My bad. It's much less common than I'd thought. (Intel had it on a number of chips that included the Iron Pro Graphics across Haswell, Broadwell, Skylake etc)

[dragontamer]

But only the Iris Pro 5200 (codename: Crystalwell) had eDRAM. All other Iris Pro were just normal DDR4.

EDIT: Oh, apparently there were smaller 64MB eDRAM on later chips, as you mentioned. Well, today I learned something.

[epmaybe]

Ha, I still use an intel 5775c in my home server!

[beebeepka]

I think the chip you are talking about is Broadwell.

[dragontamer]

Broadwell was the CPU-core.

Crystalwell was the codename for the eDRAM that was grafted onto Broadwell. (EDIT: Apparently Haswell, but... yeah. Crystalwell + Haswell for eDRAM goodness)

[Unklejoe]

L3 is SRAM on all AMD Ryzen chips that I'm aware of.

I think it's the same with Intel too except for that one 5th gen chip.