![]() They are 204-pin DDR3 SO-DIMM 1600 (PC3L 12800) Rams, which seems to be the correct type. I've tried 2 different sets of 4 GB RAM, a couple was second hand, the other Crucial nine pair. because when I try one of the new RAMs (4GB) with one of the old RAMs (2 GB), it works fine. ![]() I'm sure that's not on the Rams is not inserted properly or dusty slots etc. The Macbook I have is a mid-2009 and OSX El Capitan. I saw that others had the same question, but mine seems to be a little different. I am trying to improve my Macbook Pro 4 GB to 8 GB memory, however, when I start the laptop it emits 3 beeps, without loading the operating system and just keep it. ![]() MacBook pro emits 3 beeps after upgrade memory ![]()
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