I need to increase the RAM in our DELL servers but with the lshw I cannot see if the RAM installed is a UDIMM or RDIMM.

Handle 0x1100, DMI type 17, 28 bytes
Memory Device
    Array Handle: 0x1000
    Error Information Handle: Not Provided
    Total Width: 72 bits
    Data Width: 64 bits
    Size: 2048 MB
    Form Factor: DIMM
    Set: 1
    Locator: DIMM_A1 
    Bank Locator: Not Specified
    Type: <OUT OF SPEC>
    Type Detail: Synchronous
    Speed: 1333 MHz (0.8 ns)
    Manufacturer: 00CE00B380CE
    Serial Number: 8244850B
    Asset Tag: 02103961
    Part Number: M393B5773CH0-CH9  

Handle 0x1101, DMI type 17, 28 bytes
Memory Device
    Array Handle: 0x1000
    Error Information Handle: Not Provided
    Total Width: 72 bits
    Data Width: 64 bits
    Size: 2048 MB
    Form Factor: DIMM
    Set: 1
    Locator: DIMM_A2 
    Bank Locator: Not Specified
    Type: <OUT OF SPEC>
    Type Detail: Synchronous
    Speed: 1333 MHz (0.8 ns)
    Manufacturer: 00CE00B380CE
    Serial Number: 8244855D
    Asset Tag: 02103961
    Part Number: M393B5773CH0-CH9  

Handle 0x1102, DMI type 17, 28 bytes
Memory Device
    Array Handle: 0x1000
    Error Information Handle: Not Provided
    Total Width: 72 bits
    Data Width: 64 bits
    Size: 2048 MB
    Form Factor: DIMM
    Set: 2
    Locator: DIMM_A3 
    Bank Locator: Not Specified
    Type: <OUT OF SPEC>
    Type Detail: Synchronous
    Speed: 1333 MHz (0.8 ns)
    Manufacturer: 00CE00B380CE
    Serial Number: 8244853E
    Asset Tag: 02103961
    Part Number: M393B5773CH0-CH9  

how have we do to know which is the right RAM memory to buy?

thanks