Purchased this memory upgrade to replace a bad memory chip I had in an old 13" MacBook. It originally only had 4 gigs of memory (2 x 2 gig memory cards) and only one would read. Purchased this upgrade to get the MacBook processing a little faster and it did just the trick. Definitely still need to replace the entire MacBook but this memory upgrade works wonderfully.
Recently upgraded the hard drive and I wish I had known about this company and purchased it from them. I will be doing all my shopping for discounted Mac products here, the order was received promptly and the products are top notch.