Хочу расширить оперативку. Какой оптимальный вариант?

description: Notebook
    product: 20281 (LENOVO_MT_20281_BU_Think_FM_M5400)
    vendor: LENOVO
    version: M5400

description: Motherboard
       product: 20281  QB0
       vendor: LENOVO

memory
          description: System Memory
          physical id: a
          slot: System board or motherboard
          size: 4GiB
        *-bank:0
             description: SODIMM DDR3 Synchronous 1600 MHz (0.6 ns)
             product: RMT3170ME68F9F1600
             vendor: Fujitsu
             physical id: 0
             slot: ChannelA-DIMM0
             size: 4GiB
             width: 64 bits
             clock: 1600MHz (0.6ns)
        *-bank:1
             description: DIMM [empty]
             physical id: 1
             slot: ChannelB-DIMM0

description: CPU
          product: Intel(R) Pentium(R) CPU 3550M @ 2.30GHz
          vendor: Intel Corp.
          physical id: 5
          bus info: cpu@0
          version: Intel(R) Pentium(R) CPU 3550M @ 2.30GHz
          serial: To Be Filled By O.E.M.
          slot: CPU Socket - U3E1
          size: 2300MHz
          capacity: 2300MHz
          width: 64 bits
          clock: 100MHz