Determining how much RAM is installed in each slot on an ESX/ESXi host

To determine how much RAM is installed in each slot on an ESX/ESXi host:

1. Login to the host using an SSH client.
2. Run one of these commands as user root:
   • dmidecode|less
     
     Note: dmidecode|less is not available in 5.x versions.
     
   • smbiosDump
     
3. In the output, locate the blocks of text beginning with Memory Device. Size or Max. Size indicates the amount of memory installed.
   The output for slots that have memory modules installed appears similar to:
   Memory Device
   Array Handle: 0x1000
   Error Information Handle: Not Provided
   Total Width: 72 bits
   Data Width: 64 bits
   Size: 4096 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: 80AD009780AD
   Serial Number: 1680125F
   Asset Tag: 0109241D
   Part Number: HMT151R7AFP4C-H9
   The output for slots that are empty appears similar to:
   Memory Device
   Array Handle: 0x1000
   Error Information Handle: Not Provided
   Total Width: 72 bits
   Data Width: 64 bits
   Size: No Module Installed
   Form Factor: DIMM
   Set: 2
   Locator: DIMM_A4
   Bank Locator: Not Specified
   Type: <OUT OF SPEC>
   Type Detail: Synchronous
   Speed: Unknown
   Manufacturer:
   Serial Number:
   Asset Tag:
   Part Number: