Dual Channeling Question

Can these two model hit a dual channel mode?
kvr1333d3n9/2g
kvr1333d3n9/4g


These RAMs are value RAM of Kingston and have different sizes one is 2gb ddr3 1333mhz and the other one is 4gb ddr3 1333mhz. I have an Athlon II x3 440 processor and ASRock M3A785GM-LE/128M mobo, will those RAM run in dual channel mode?
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  1. Check your motherboard manual. Some boards allow different sizes, others do not.

    From page 16 of the manual:

    2.3 Installation of Memory Modules (DIMM)
    M3A785GM-LE/128M motherboard provides two 240-pin DDR3 (Double Data Rate
    3) DIMM slots, and supports Dual Channel Memory Technology. For dual channel
    configuration, you always need to install two identical (the same brand, speed,
    size and chip-type) memory modules in the DDR3 DIMM slots to activate Dual Channel

    Memory Technology. Otherwise, it will operate at single channel mode.
    1. It is not allowed to install a DDR or DDR2 memory module into
    DDR3 slot;otherwise, this motherboard and DIMM may be damaged.
    2. If you install only one memory module or two non-identical memory
    modules, it is unable to activate the Dual Channel Memory
    Technology.
  2. Okay, thanks it says identical which means totally twins like identical twins.
  3. Welcome to Tom's Forum! :)

    No Dual Channel mode is not possible with unmatched sized memory memory with the ASRock M3A785GM-LE/128M which requires sticks to be the same as indicated "same brand, speed,
    size and chip-type." Further, you'd need to a a 64-bit OS to access anything greater than 4GB or RAM.

    Use this list and purchase a Matched Set of RAM -> http://www.ec.kingston.com/ecom/configurator_new/modelsinfo.asp?SysID=63042&mfr=ASRock&model=M3A785GM&search_type=&root=us&LinkBack=http%3A%2F%2Fwww.kingston.com&Sys=63042-ASRock-M3A785GM-LE%2F128M%09%09+Motherboard&distributor=0&submit1=Search

    1X2GB 1333 9-9-9 @ 1.5v non-ECC http://www.valueram.com/datasheets/KVR1333D3N9_2G.pdf
    1X4GB 1333 9-9-9 @ 1.5v non-ECC http://www.valueram.com/datasheets/KVR1333D3N9_4G.pdf
    ASRock M3A785GM-LE/128M http://www.asrock.com/mb/overview.asp?Model=M3A785GM-LE/128M

    "you always need to install two identical (the same brand, speed,
    size and chip-type) memory modules in the DDR3 DIMM slots to activate Dual Channel
    Memory Technology. Otherwise, it will operate at single channel mode."

    Specs:
    - Dual Channel DDR3 memory technology
    - 2 x DDR3 DIMM slots
    - Supports DDR3 1600(OC)/1333/1066/800 non-ECC, un-buffered memory
    - Max. capacity of system memory: 8GB*


    Good Luck!
  4. Problem Solved guys, thanks a lot.. Thread Close.
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