What are the architectural differences between the WS-X6748-GE-TX, WS-X6748-SPF and the WS-X6724-SPF (ports per ASICs, buffers Tx-Rx, fabric connections, etc.)? Also, if someone has information about the oversubscription rate of the cards it would be great.
6748-SFP & 6724-SFP can be used in data centre for uplinks from access switches to distribution switches and distribution switches to core siwtches.
They can also be used for connecting blade chassis switches back to the distribution layer.
6748-GE-TX as you say primarily for servers in data centre but can also be used for connecting routers etc.
I guess 6748 GE-TX for data center as it best supports 1000Mbps connections over ethernet media.
Where as the 6748-SFP or 6724-SFP modules gives you a choice to support a 1000BaseT or 1000Base SX of LX or ZX ports which will support fiber cable and which can typically be used at disctribution/core layer.