~$ sudo  dmidecode  | grep -i "memory module inf" -A 8
Memory Module Information
        Socket Designation: DIMM_A1
        Bank Connections: 0 1
        Current Speed: 25 ns
        Type: DIMM SDRAM
        Installed Size: 1024 MB (Double-bank Connection)
        Enabled Size: 1024 MB (Double-bank Connection)
        Error Status: OK

--
Memory Module Information
        Socket Designation: DIMM_A2
        Bank Connections: 2 3
        Current Speed: Unknown
        Type: DIMM SDRAM
        Installed Size: Not Installed
        Enabled Size: Not Installed
        Error Status: OK

--
Memory Module Information
        Socket Designation: DIMM_B1
        Bank Connections: 4 5
        Current Speed: Unknown
        Type: DIMM SDRAM
        Installed Size: Not Installed
        Enabled Size: Not Installed
        Error Status: OK

--
Memory Module Information
        Socket Designation: DIMM_B2
        Bank Connections: 6 7
        Current Speed: Unknown
        Type: DIMM SDRAM
        Installed Size: Not Installed
        Enabled Size: Not Installed
        Error Status: OK