AMD Announces 7950X3D, 7900X3D Upto 128MB L3 Cache
The buried lede of these is that they have asymmetric L3 cache. One CCD gets the 3D V-cache stacked on top, the other doesn't. That's almost certainly how AMD managed to solve the thermal and clock issues of the 5800X3D - they didn't. The 3D CCD will run hot (at low power) with lower clocks and the non-3D CCD is responsible for reaching the advertised boost clocks.<p>Note how the 7800X3D, a single CCD SKU, has an advertised maximum clock of 5 GHz, compared to the 5.6/5.7 of the two dual CCD SKUs (the 7700X below it advertises 5.4 GHz). Don't expect the 3D cached-cores to exceed 5 GHz on those other parts.<p>This means that the performance profile of the two CCDs is <i>very</i> different. Not "P vs E core" different, but still significant. If you run (most) games, you want to put all their threads on the first CCD. If you run (most other) lightly threaded workloads, you'd often want the other, non-3D CCD.<p>This seems like a rather significant scheduling nightmare to me.