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I have a R610 Dell server running Ubuntu Server. 48GB of RAM total - 12x 4GB DDR3 sticks. Has been running fine for 3 months, I notice htop/top now reports only 24GB available. Same with free -m

dmidecode -t17 however does detect all the RAM. dmidecode -t17 output:

# dmidecode 3.0
Getting SMBIOS data from sysfs.
SMBIOS 2.6 present.

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: 4096 MB
    Form Factor: DIMM
    Set: 1
    Locator: DIMM_A1 
    Bank Locator: Not Specified
    Type: DDR3
    Type Detail: Synchronous Registered (Buffered)
    Speed: 1333 MHz
    Manufacturer: 00AD00B380AD
    Serial Number: 0CA21728
    Asset Tag: 01111761
    Part Number: HMT351R7BFR8A-H9  
    Rank: 2

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: 4096 MB
    Form Factor: DIMM
    Set: 1
    Locator: DIMM_A2 
    Bank Locator: Not Specified
    Type: DDR3
    Type Detail: Synchronous Registered (Buffered)
    Speed: 1333 MHz
    Manufacturer: 00AD00B380AD
    Serial Number: 0C7216E5
    Asset Tag: 01111761
    Part Number: HMT351R7BFR8A-H9  
    Rank: 2

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: 4096 MB
    Form Factor: DIMM
    Set: 2
    Locator: DIMM_A3 
    Bank Locator: Not Specified
    Type: DDR3
    Type Detail: Synchronous Registered (Buffered)
    Speed: 1333 MHz
    Manufacturer: 00AD04B380AD
    Serial Number: 5068621C
    Asset Tag: 01113711
    Part Number: HMT351R7BFR8A-H9  
    Rank: 2

Handle 0x1103, DMI type 17, 28 bytes
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: 2
    Locator: DIMM_A4 
    Bank Locator: Not Specified
    Type: DDR3
    Type Detail: Synchronous Registered (Buffered)
    Speed: 1333 MHz
    Manufacturer: 00AD04B380AD
    Serial Number: 5038621B
    Asset Tag: 01113711
    Part Number: HMT351R7BFR8A-H9  
    Rank: 2

Handle 0x1104, DMI type 17, 28 bytes
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: 3
    Locator: DIMM_A5 
    Bank Locator: Not Specified
    Type: DDR3
    Type Detail: Synchronous Registered (Buffered)
    Speed: 1333 MHz
    Manufacturer: 00AD00B380AD
    Serial Number: 0CA216E9
    Asset Tag: 01111761
    Part Number: HMT351R7BFR8A-H9  
    Rank: 2

Handle 0x1105, DMI type 17, 28 bytes
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: 3
    Locator: DIMM_A6 
    Bank Locator: Not Specified
    Type: DDR3
    Type Detail: Synchronous Registered (Buffered)
    Speed: 1333 MHz
    Manufacturer: 00AD00B380AD
    Serial Number: 285AB994
    Asset Tag: 01120861
    Part Number: HMT351R7BFR8A-H9  
    Rank: 2

Handle 0x1109, DMI type 17, 28 bytes
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: 5
    Locator: DIMM_B1 
    Bank Locator: Not Specified
    Type: DDR3
    Type Detail: Synchronous Registered (Buffered)
    Speed: 1333 MHz
    Manufacturer: 00AD00B380AD
    Serial Number: 0140008E
    Asset Tag: 01114461
    Part Number: HMT351R7BFR8A-H9  
    Rank: 2

Handle 0x110A, DMI type 17, 28 bytes
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: 6
    Locator: DIMM_B2 
    Bank Locator: Not Specified
    Type: DDR3
    Type Detail: Synchronous Registered (Buffered)
    Speed: 1333 MHz
    Manufacturer: 00AD00B380AD
    Serial Number: 281AB984
    Asset Tag: 01120861
    Part Number: HMT351R7BFR8A-H9  
    Rank: 2

Handle 0x110B, DMI type 17, 28 bytes
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: 6
    Locator: DIMM_B3 
    Bank Locator: Not Specified
    Type: DDR3
    Type Detail: Synchronous Registered (Buffered)
    Speed: 1333 MHz
    Manufacturer: 00AD00B380AD
    Serial Number: 0C82170C
    Asset Tag: 01111761
    Part Number: HMT351R7BFR8A-H9  
    Rank: 2

Handle 0x110C, DMI type 17, 28 bytes
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: 4
    Locator: DIMM_B4 
    Bank Locator: Not Specified
    Type: DDR3
    Type Detail: Synchronous Registered (Buffered)
    Speed: 1333 MHz
    Manufacturer: 00AD00B380AD
    Serial Number: 03798229
    Asset Tag: 01114961
    Part Number: HMT351R7BFR8A-H9  
    Rank: 2

Handle 0x110D, DMI type 17, 28 bytes
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: 5
    Locator: DIMM_B5 
    Bank Locator: Not Specified
    Type: DDR3
    Type Detail: Synchronous Registered (Buffered)
    Speed: 1333 MHz
    Manufacturer: 00AD00B380AD
    Serial Number: 1F3210BE
    Asset Tag: 01114261
    Part Number: HMT351R7BFR8A-H9  
    Rank: 2

Handle 0x110E, DMI type 17, 28 bytes
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: 6
    Locator: DIMM_B6 
    Bank Locator: Not Specified
    Type: DDR3
    Type Detail: Synchronous Registered (Buffered)
    Speed: 1333 MHz
    Manufacturer: 00AD00B380AD
    Serial Number: 0CA216F5
    Asset Tag: 01111761
    Part Number: HMT351R7BFR8A-H9  
    Rank: 2

Any ideas?

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