For throughput capacity, for a Cisco chassis "switch", you probably would find the top end of the Nexus series with the most capacity. This series is marketed for Data Centers.
CPU, for top of the line switches, generally is a non factor as dedicated hardware supports the data plane.
Likewise, provided RAM, is often not much of a factor, for expected usage.
Other hardware, though, like TCAM capacity, is often an important capacity consideration.
There's much more to selecting a chassis switch beyond some large forwarding capacity, assuming that's what capacity means to you.
Also, when Cisco says a chassis device is a switch vs. it's a chassis router, that can be as much marketing vs. true actual differences, as almost always the chassis switch is a L3 switch.
(Best historic Cisco case example was the 6500 chassis switch vs. the 7600 chassis router, where both chassis could use the same supervisor cards, the same Ethernet port line cards, and even the same IOS binary. But, 6500 had some cards that would only work in its chassis, ditto 7600.)
Anyway, to select a switch, you should have much more info about its service needs.
