I bought this 8GB RAM kit (4GB x2) to upgrade the original 4GB that originally came with our MacBook Pro ( Early 2011, 8, 1 ) Since then, Maverick, Mac OS 10.9 has been feeling a bit sluggish. I removed the bottom of the laptop, removed the old 2GB sticks and installed the new 4GB in less than 5 minutes. Boot the machine and confirm that the system read 8GB, which it did. Would buy again without reservations.
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