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All fabs have libraries that their customers use to turn chip RTL to actual transistor layout to be fabbed. Apple silicon is made using mobile libraries, same
by dhruvdh 3y ago
All fabs have libraries that their customers use to turn chip RTL to actual transistor layout to be fabbed.
Apple silicon is made using mobile libraries, same as their iPhone and iPad chips. Even though they're made on these dense libraries, the chip is still very big, since they need to include CPUs, GPUs, NPUs, and all of their fixed function hardware.
All of this puts a limit in terms of frequency and core count. You will find that other server hardware in this price range significantly outperforms Apple silicon , save for those video workloads they're missing fixed function hardware for.
M2 Ultra has some 134B transistors, when you compare with an equivalent chip like MI300 (146B), you find that really, in terms of raw compute, there is no comparison. We will have more details on MI300 today, watch out for the news cycle.
This is an excellent read in terms of what difference using dense vs performance libraries can make - https://www.semianalysis.com/p/zen-4c-amds-response-to-hyperscale https://www.semianalysis.com/p/zen-4c-amds-response-to-hyper...
- daneel_w 3y ago> "All of this puts a limit in terms of frequency and core count. You will find that other server hardware in this price range significantly outperforms Apple silicon , save for those video workloads they're missing fixed function hardware for." I think the power envelope, not the price tag, is the better metric when comparing how server-y or phone-y the silicon it. > "M2 Ultra has some 134B transistors, when you compare with an equivalent chip like MI300 (146B), you find that really, in terms of raw compute, there is no comparison. We will have more details on MI300 today, watch out for the news cycle." And unsurprisingly it will certainly come with an incomparable TDP.
- threeseed 3y ago> save for those video workloads they're missing fixed function hardware You do know that the Mac Pro is targeted specifically at those workloads.