We have MDS9509/9513 with X9124 modules with 4Gb ports.
We do notice that FMS reports a fix 400MB (shareable ofcource) for an interface speed, where as the "show interface" command shows the speed of the interface as 4Gbps (which translates to 512MB).
Which of this two is correct? Please find below an extract from the command line and FMS. The FMS shows the "I/F Speed" as "400.00MB", but the "Peak Tx/sec" is peaked to "416.419MB". The CLI shows the speed of the interface as "4 Gbps" which translates to 516MB.
fc10/8 is up
Hardware is Fibre Channel, SFP is short wave laser w/o OFC (SN)
Port WWN is 22:48:00:0d:ec:3c:2f:80
Admin port mode is FX
snmp link state traps are enabled
Port mode is F, FCID is 0x680031
Port vsan is 10
Speed is 4 Gbps