Only 8 Gbps FC cards are supported in PowerEdge R340. You can refer below link for details [URL] C856M and R7WP7 are part number of FC8 card supported in PowerEdge R340
Hello All I'm looking for a Dual Port 16Gbps Fiber Channel HBA (part number) supported for Dell PowerEdge R340.  Any help greatly appreciated. Cheers GMALAN
Supported fiber channel HBA for Dell PE R340