When the ports are in 40 Gig mode you will only have port 49,53,57 and 61 available for use. If you partition the ports to 4x10 Gig you will have the NP (Not Present) ports also available.
conf port 49 partition 4x10G
conf port 53 partition 4x10G
conf port 57 partition 4x10G
conf port 61 partition 4x10G