Bad ram or my fault?

Discussion in 'MacBook Pro' started by JephB, Sep 6, 2013.

  1. JephB macrumors newbie

    Apr 5, 2011

    2009 15" unibody 2.5ghz A1286 , wanted to upgrade the ram (2x2gb pc3-8500) so i ordered a 2x4gb kit from corsair. I got a pair of pc3-10600, which runs at 1333mhz. I know my mac can only run ram at 1066, but i tried it anyway, since I've heard it should still run at the slower speed. I got the dreaded 3 beeps on boot. tried reseating, same result. Is the new ram bad, or just unable to function at all in my mac (despite what I've heard about underclocking).

  2. jav6454 macrumors P6


    Nov 14, 2007
    1 Geostationary Tower Plaza
    It means the RAM speed and bus speed won't play nice. Return it and get the proper speed.

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