I have a MacBook Air 2012 (A1466) and it developed some memory errors. It crashes every half hour and Apple Hardware Test says
Unfortunately, RAM is soldered on the motherboard and it is not replaceable.
I did some research and found that it is possible to tell the operating system to ignore wrong memory addresses if you use Linux: Ubuntu Forums: Exclude Bad Memory
Is is possible to somehow exclude faulty RAM addresses in Mac OS X?
I currently use Yosemite (10.10) but, I am willing to downgrade if necessary.