Atualizar laptop RAM

Question

Não tenho certeza se posso atualizar minha memória de laptops. Se sim, não sei como descobrir qual tipo de memória é compatível e qual é o máximo. Eu tenho um Packard Bell Easynote LJ65. Executando um Ubuntu 64 bits. Minha RAM atual é de 4GB.

Eu li em muitos sites que para o meu laptop o máximo é de 4GB. Quando eu digitei o terminal sudo dmidecode -t 16 eu tenho isso:

 # dmidecode 3.0
Getting SMBIOS data from sysfs.
SMBIOS 2.4 present.

Handle 0x0014, DMI type 16, 15 bytes
Physical Memory Array
    Location: System Board Or Motherboard
    Use: System Memory
    Error Correction Type: None
    Maximum Capacity: 8 GB
    Error Information Handle: No Error
    Number Of Devices: 2

se eu digitar sudo lshw -short -C memory , obtenho:

H/W path                 Device      Class       Description
============================================================
/0/0                                 memory      1MiB BIOS
/0/14                                memory      4GiB System Memory
/0/14/0                              memory      2GiB SODIMM Synchronous 800 MHz
/0/14/1                              memory      2GiB SODIMM Synchronous 800 MHz
/0/1f/20                             memory      2MiB L2 cache
/0/1f/22                             memory      32KiB L1 cache
/0/21                                memory      32KiB L1 cache

E se eu digitar sudo lshw -c memory , obtenho:

*-firmware              
       description: BIOS
       vendor: Packard Bell
       physical id: 0
       version: V2.11
       date: 07/02/2010
       size: 1MiB
       capabilities: pci upgrade shadowing cdboot bootselect socketedrom edd int13floppynec int13floppytoshiba int13floppy360 int13floppy1200 int13floppy720 int13floppy2880 int9keyboard int10video acpi usb
  *-memory
       description: System Memory
       physical id: 14
       slot: System board or motherboard
       size: 4GiB
     *-bank:0
          description: SODIMM Synchronous 800 MHz (1.2 ns)
          product: 000000000000000000000000000000000000
          vendor: 0000000000000000
          physical id: 0
          serial: 00000000
          slot: DIMM0
          size: 2GiB
          clock: 800MHz (1.2ns)
     *-bank:1
          description: SODIMM Synchronous 800 MHz (1.2 ns)
          product: 000000000000000000000000000000000000
          vendor: 0000000000000000
          physical id: 1
          serial: 00000000
          slot: DIMM2
          size: 2GiB
          clock: 800MHz (1.2ns)
  *-cache:0
       description: L2 cache
       physical id: 20
       slot: L2 Cache
       size: 2MiB
       capacity: 2MiB
       capabilities: synchronous internal write-back unified
       configuration: level=2
  *-cache:1
       description: L1 cache
       physical id: 22
       slot: L1 Cache
       size: 32KiB
       capacity: 32KiB
       capabilities: synchronous internal write-back data
       configuration: level=1
  *-cache
       description: L1 cache
       physical id: 21
       slot: L1 Cache
       size: 32KiB
       capacity: 32KiB
       capabilities: synchronous internal write-back instruction
       configuration: level=1

Obrigado antecipadamente