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The maximum throughput of a switch depends on its internal bandwidth and its packets per second forwarding capacity.
In Cisco specifications, maximum fabric bandwidth needed is twice all your port bandwidths (non-duplex bandwidth, e.g. 100 Mbps, gig, etc.).
Maximum packets per second needed (PPS) is based on packet size. Smaller packets increase the need for PPS. For Ethernet, if you don't know expected packet size, you generally assume worse case which is 1.488 Mpps per 1 Gbps. Maximum PPS needed would be all your port bandwidths (again non-duplex bandwidth) times 1.488 Mpps per Gbps.
