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Do you have to have matching brands of RAM in your laptop? I have two sticks of RAM one Apacer and one KingMAX. According to memtest both are fine alone, but when I put them both in only the Apacer has problems it registers 4000 or so errors and on test #5. Even when they're in different slots only the apacer registers errors. once again its fine when its alone. Thanks for any thoughts.