Mr. Camel (no.thanks.delete@this.gmail.com) on October 9, 2020 6:30 pm wrote:
> Blue (blue.delete@this.blue.com) on October 8, 2020 9:58 am wrote:
> > AMD's announce Zen3 with an average of 19% IPC uplift "in desktop applications"
> > and about a 5-10% clockspeed boost (ST, MT unknown).
> >
> > Seems like they're rightfully pushing to up their margin.
> >
> > If AMD can keep up this 15-19% gains every generation, when do
> > the "big on ARM" folks think ARM will effectively catch up?
>
> How would an 8 core Zen 3 desktop chip compare to a desktop class 8 core Willow Cove chip?
>
> This assumes that a desktop Willow Cove could hit higher frequencies
> than the mobile version due to more thermal headroom.
>
>

The single-thread Cinebench showed Zen 3 @ 4.8 GHz as faster by 6% than Willow Cove (Tiger Lake) at the same 4.8 GHz.

So Rocket Lake (it is not known whether its Cypress Cove core is more similar to Willow Cove or to its predecessor from Ice Lake, but the differences between these 2 cores are small anyway) will have to reach at least 5.3 GHz to slightly exceed a 4.9 GHz Zen 3.


For multi-threaded applications an 8-core Rocket Lake will be limited to a lower base frequency than Comet Lake (because of doing more work per clock cycle) and it is unlikely that it would match even a 12-core Zen 2, and certainly it will be easily beaten by an 8-core Zen 3, due to its higher energy efficiency leading to higher clock frequencies when limited by the TDP. The low efficiency of Rocket Lake for power-limited MT tasks will be mitigated by 125 W vs. 105 W, but compared to Zen 3 this will not be enough.