This is just my understanding having used Macs since 2002, and having replaced most of the Ram, Hard drives and Batteries myself. The reason this can happen is because one slot is working overtime and there is often a tendency for the machine to run much slower than it is actually capable of doing. Such as, "Crashes, Freezes, and eventually over longer periods may even do damage to the MotherBoard, where over-heating can possibly occur. I hope this no longer an issue for you however, as I understand it having unequal Ram size is not a huge problem, but you must make sure the Manufacturers are compatible, and operate at the same speed, or you will end up with instabilities with the system. He's right, I have a lesser macbook pro that's still working. Most macs can live up to 10 or more years without any problem. Odd chances I may have one that would be short lived after 3 years. They also said that I may have a one of the odd defective logic boards because apple's pumping out thousands of these. They are sending me another one and returning this defective one as I get a life time warranty. Alternating and there are 8 on each side. I'm noticing that some dark chips are upside down on both sides. On each of the chips I see the following: I can just make out on the sticker below that code PRINCETON. There is a sticker with numbers GPM1333NS3C98GBT. 2gb from standard apple ram and one 8gb from ramjet aftermarket.
4GB RAM FOR MAC 2010 UPGRADE
Because my ram upgrade is an aftermarket they will try to blame it on uneven chip set. They said apple would try to blame aftermarket parts that may damage the standard apple products if found.
4GB RAM FOR MAC 2010 HOW TO
Not sure how to post a hi res photo here. I've had others tell me now should be matched. They said it was "absolutely" fine with miss match. I'm going try to get some compensation from ramjet. The apple agent said it's was like having unequal tire size. I do a lot of heavy processing software like Photoshop CS5 and Final Cut Pro x and running lots of apps together. They mentioned long term use of unmatched ram can put tremendous strain on the bigger ram causing constant over heating build up on part of the logic board it will start failing. They gave me back in a static free envelope the aftermarket ramjet 8gb. I had to do the flat rate fix of $310 thru apple genious to have the logic board and both slot rams replaced back to 4gb ram.
Well, I've had that upgraded since last October 2013 and on may 20th 2014 after 8 months my MacBook Pro malfunctioned. Well, I did the 2gb in one slot which is still the apple standard and just replace the second slot with "ramjet" brand 8gb making it 10gb. Well I have a late 2011 MacBook Pro 15 and I bought it at that time, 2011.
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