PC fails to load with three memory sticks

By Dray
Jun 14, 2011
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  1. Motherboard type: Gigabyte GA-P31-DS3L
    it has 4 memory slots (2 red and 2 yellow)

    I had 2x1G sticks of this type:
    DIMM3: Mushkin 991529 (996529) 1 GB DDR2-800 DDR2 SDRAM (5-5-5-18 @ 400 MHz) (4-4-4-12 @ 266 MHz)

    And recently bought a 2GB stick:
    DIMM1: Samsung M3 78T5663QZ3-CF7 2 GB DDR2-800 DDR2 SDRAM (6-6-6-18 @ 400 MHz) (5-5-5-15 @ 333 MHz) (4-4-4-12 @ 266 MHz)

    Tried to connect all 3 together in any possible way but my PC wouldn't start or
    reboot before windows gets to load.
    I tried to pull out the old 2x1GB sticks and just put the new 2GB one and it
    worked perfectly.
    Now i installed 1GB+2GB and it works great but
    i bought the new stick in order to have 4GB total, not 3.

    Any way i can fix this? maybe i'm doing something wrong?
    or could it be a bios problem? my bios version is F8 (2 updates behind the latest version)
  2. Tmagic650

    Tmagic650 TS Ambassador Posts: 17,233   +234

    All the memory sticks should be the same type and speed modules. Your speeds and manufacturers are different. Some motherboards are more sensitive to this than others
  3. Dray

    Dray TS Rookie Topic Starter

    Than how come i can run the pc with the 2GB and 1GB? they're different types/speeds
    the question is why i cant install all 3

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