Память моего ПК показывает 4 ГБ вместо 8 ГБ

Я хотел бы получить помощь по моей проблеме,

у меня 8 ГБ на двух слотах разных моделей, но после сбоя Ubuntu это показывает

только один

    sudo inxi -m

Memory:

Used/Total: 1337.2/3418.7MB
           Array-1 capacity: 8 GB devices: 2 EC: None   



    sudo lshw -short -c memory
H/W path         Device      Class       Description
====================================================
/0/0                         memory      128KiB BIOS
/0/b                         memory      8GiB System Memory
/0/b/0                       memory      4GiB SODIMM DDR3 Synchronous 1333 MHz (0.8 ns)
/0/b/1                       memory      4GiB SODIMM DDR3 Synchronous 1333 MHz (0.8 ns)
/0/11/12                     memory      512KiB L1 cache
/0/11/13                     memory      4MiB L2 cache

sudo dmidecode -t memory
Handle 0x000B, DMI type 16, 23 bytes
Physical Memory Array
    Location: System Board Or Motherboard
    Use: System Memory
    Error Correction Type: None
    Maximum Capacity: 8 GB
    Error Information Handle: Not Provided
    Number Of Devices: 2

Handle 0x000C, DMI type 17, 34 bytes
Memory Device
    Array Handle: 0x000B
    Error Information Handle: Not Provided
    Total Width: 64 bits
    Data Width: 64 bits
    Size: 4096 MB
    Form Factor: SODIMM
    Set: None
    Locator: Bottom-Slot 1(top)
    Bank Locator: BANK0
    Type: DDR3
    Type Detail: Synchronous
    Speed: 1333 MT/s
    Manufacturer: Kingston
    Serial Number: 5C2E3B56
    Asset Tag: Unknown
    Part Number: 9905469-157.A00LF 
    Rank: 1
    Configured Clock Speed: 667 MT/s

Handle 0x000E, DMI type 17, 34 bytes
Memory Device
    Array Handle: 0x000B
    Error Information Handle: Not Provided
    Total Width: 64 bits
    Data Width: 64 bits
    Size: 4096 MB
    Form Factor: SODIMM
    Set: None
    Locator: Bottom-Slot 2(under)
    Bank Locator: BANK0
    Type: DDR3
    Type Detail: Synchronous
    Speed: 1333 MT/s
    Manufacturer: Hynix
    Serial Number: 0D13F99D
    Asset Tag: Unknown
    Part Number: HMT351S6CFR8C-PB  
    Rank: 2
    Configured Clock Speed: 667 MT/s

free -h
              total        used        free      shared  buff/cache   available
Mem:           3.3G        1.5G        968M         64M        917M        1.6G
Swap:          7.6G          0B        7.6G