eDRAM too expensive

By: David Kanter (dkanter.delete@this.realworldtech.com), January 13, 2019 2:34 pm
Room: Moderated Discussions
anon³ (alt-0179.delete@this.test.example.test) on January 13, 2019 1:17 pm wrote:
> JS (null.delete@this.null.com) on January 12, 2019 1:05 am wrote:
> > > We could wait a little about power consumption.
> > > The node shift is unable to halve the power consumption
> > > on an high power cpu, moreover half the SKU is on 14nm.
> > > More likely AMD demoed on a very light development motherboard unable of overclock. My bet
> > > Intel was on a power hungry plataform thinked to allow more than 300W under overclocking.
> > >
> > > Better wait real products.
> > > For now is only smart marketing.
> >
> > Correct me if I'm wrong but the IO die on 14nm shouldn't be a significant limiting factor
> > for the chip. It's relative simplicity to the processor die should make it clock relatively
> > well, or at least parallel silicon could be added to make up for any deficit?
>
> IO die on GF/IBM 14nm is going to be just fine. IO structures scale abysmally with
> process (it's all about gate oxides and voltage rating), so once you've paid the
> costs to go off-die, it doesn't matter much what process the IO die is on.
>
> It's interesting that the IO die is claimed to be "14nm", though, not "12nm". Zen+
> is 12nm, so there's no reason the IO die wouldn't also be on 12nm. At least, that's
> if the target process was GF 14LP/12LP (which are almost the same process).
>
> That implies the target is actually GF/IBM's 14HP. And that lines up perfectly, since by all accounts
> 14HP is an excellent choice for IO-heavy designs. It also implies that there could be eDRAM on the IO
> die, but that seems unlikely given the target die size and yields. Perhaps they've managed some clever
> use of a small amount of eDRAM somewhere (it does seem the sort of thing that would be useful on an
> all-IO die), or perhaps they've got a custom eDRAM-less process variant to save a bit of cost.

eDRAM is incredibly expensive and SRAM is better for small arrays. I wouldn't worry too much about what they call it.

Honestly, 12nm is mostly just 14nm with different libraries (for density) and transistor/contact optimization. I/O doesn't need logic libraries, ergo its 14nm.

David
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            eDRAM too expensiveDavid Kanter2019/01/13 02:34 PM
              eDRAM too expensiveAdrian2019/01/13 08:51 PM
                eDRAM too expensiveAdrian2019/01/13 09:01 PM
                eDRAM too expensiveRicardo B2019/01/14 11:06 AM
                  Zen PHY speedsJeff S.2019/01/14 11:40 AM
                  eDRAM too expensiveAdrian2019/01/14 12:44 PM
                    Zen target process (was: eDRAM too expensive)hobold2019/01/14 02:42 PM
                      Zen target process (was: eDRAM too expensive)Adrian2019/01/14 09:13 PM
                        Zen target process (was: eDRAM too expensive)hobold2019/01/15 08:28 PM
                    eDRAM too expensiveRicardo B2019/01/15 03:40 AM
                    eDRAM too expensiveRicardo B2019/01/15 08:26 AM
              eDRAM too expensiveMaynard Handley2019/01/14 10:38 AM
                eDRAM too expensiveanon2019/01/14 01:00 PM
                  eDRAM too expensiveMaynard Handley2019/01/14 01:43 PM
                    eDRAM too expensiveDan Fay2019/01/14 02:16 PM
                      eDRAM too expensiveMaynard Handley2019/01/14 03:40 PM
                        eDRAM too expensiveDan Fay2019/01/14 04:58 PM
                    eDRAM too expensivesomeone2019/01/15 08:20 AM
                eDRAM too expensiveanon2019/01/14 03:34 PM
                  eDRAM too expensiveMaynard Handley2019/01/14 05:34 PM
                eDRAM too expensiveanon2019/01/15 01:06 AM
            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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