AMD CPU die size & functionality

By: Wes Felter (wmf.delete@this.felter.org), January 15, 2019 4:35 pm
Room: Moderated Discussions
Alberto (git.delete@this.git.it) on January 15, 2019 12:57 pm wrote:
> Wes Felter (wmf.delete@this.felter.org) on January 15, 2019 11:12 am wrote:

> > The Zeppelin (Ryzen 1xxx) die is 212 mm2 and its CCXs are 88 mm2 leaving 124 mm2 for the uncore. Now
> > we see that the Matisse (Ryzen 3xxx) IO die is 122 mm2 — virtually the same size on the same process
> > for the same functionality. I know this is highly simplistic but it makes a lot of sense.
> >
> > And if you multiply the 124 mm2 by 4 for Rome you get 500 mm2 while the Rome IO
> > die is smaller (there is presumably redundant stuff that can be eliminated), so
> > I don't see room for L4 there either, although maybe a snoop filter would be nice.
>
> So your calculations say the shift to 7nm ended in an advantage of only 8mm2 in the 8 cores chiplet
> (yes there is a larger L3 and the interface to the I/O chip but the new process is very compact).
> Strange.
> The implementation looks suboptimal at the best, more like a foundry 10nm to be generous.

I don't really know what's up with the CPU chiplet. Clearly the Zen 2 cores are larger due to double AVX and the L3 is larger as you said. I don't think it would make sense to move uncore functionality into the CPU chiplet so I doubt that's where the area is going. Maybe there's a fat SDF/GMI in the CPU chiplet and another SDF/GMI(s) in the IO die.

The Matisse IO die is massive compared to, say, the Coffee Lake uncore but I think that's fat inherited from Zeppelin. I don't think there's magic awesomeness hiding anywhere.
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                  eDRAM too expensiveMaynard Handley2019/01/14 05:34 PM
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            AMD IO diejuanrga2019/01/14 03:04 AM
              AMD IO dieMaynard Handley2019/01/14 10:42 AM
                AMD IO dieAlberto2019/01/14 02:00 PM
                AMD IO diejuanrga2019/01/15 02:54 AM
                AMD IO die size & functionalityWes Felter2019/01/15 11:12 AM
                  AMD IO die size & functionalityjuanrga2019/01/15 11:43 AM
                  AMD IO die size & functionalityAlberto2019/01/15 12:57 PM
                    AMD CPU die size & functionalityWes Felter2019/01/15 04:35 PM
                      AMD CPU die size & functionalityanon2019/01/16 01:32 AM
                        AMD CPU die size & functionalityAlberto2019/01/16 05:40 AM
                      AMD CPU die size & functionalityJan Olšan2019/01/16 07:11 AM
                  AMD IO die size & functionalityMaynard Handley2019/01/16 09:17 AM
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