The SoC is connected with 2.5Gbit (full duplex) to the switch. There shouldn’t be any bottlenecks on the network side for a near 2Gbit total throughput per port.
Heatsink + fan is probably overkill. Marvell claims less than 1W TDP on the SOC.
A really small heatsink just to dissipate the heat should be more than enough.
