How much memory can i insert into my Linux box

One could use dmidecode tool to get info about memory installed

$ dmidecode -t memory

# dmidecode 2.11

SMBIOS 2.7 present.

Handle 0x0007, DMI type 16, 23 bytes

Physical Memory Array

        Location: System Board Or Motherboard

        Use: System Memory

        Error Correction Type: None

        Maximum Capacity: 16 GB

        Error Information Handle: Not Provided

        Number Of Devices: 2

Handle 0x0008, DMI type 17, 34 bytes

Memory Device

        Array Handle: 0x0007

        Error Information Handle: Not Provided

        Total Width: 64 bits

        Data Width: 64 bits

        Size: 4096 MB

        Form Factor: SODIMM

        Set: None

        Locator: ChannelA-DIMM0

        Bank Locator: BANK 0

        Type: DDR3

        Type Detail: Synchronous

        Speed: 1333 MHz

        Manufacturer: Hynix/Hyundai

        Serial Number: 0654A654

        Asset Tag: None

        Part Number: HMT351S7C5R6C-PB  

        Rank: Unknown

        Configured Clock Speed: 1333 MHz

Handle 0x0009, DMI type 17, 34 bytes

Memory Device

        Array Handle: 0x0007

        Error Information Handle: Not Provided

        Total Width: 64 bits

        Data Width: 64 bits

        Size: 8192 MB

        Form Factor: SODIMM

        Set: None

        Locator: ChannelB-DIMM0

        Bank Locator: BANK 2

        Type: DDR3

        Type Detail: Synchronous

        Speed: 1333 MHz

        Manufacturer: 029E

        Serial Number: 00000000

        Asset Tag: None

        Part Number: CMSO8GX4M1A1666C9 

        Rank: Unknown

        Configured Clock Speed: 1333 MHz