Most helpful critical review
48 of 68 people found the following review helpful
Package claims compatibility, real life does not
on March 30, 2012
ALWAYS test new RAM, thoroughly. You do not want kernel panics, sudden freeze-ups, data corruption, etc, to happen.
I have 8GB of Kingston HyperX RAM (2x4, 1600MHz)
Upgrading to this Corsair brand made for Macs, it took 2.7 runs of Memtest86 for Mac to run before it errored out.
By then the MBP was over 48C in temperature (idle).
Putting back the original RAM, idle temps were back at 38C and the system ram 4 passes smoothly, begging for more.
MC725 was said to be compatible, even on the package.
Maybe I got a bad module in the matched set, but I cannot waste the lifespan of my laptop testing everything coming in. Each pass takes a couple of hours... times 3~5 to be sure. One usually gets 16GB to use it, so you want it to be reliable.
Apple is also on record saying the 2011 MBPs support up to 8GB only. I have a feeling they might be telling the truth. 16GB might be seen, but if the system is not stable or runs too hot, there's no point in having it.
Definitely buy if you have a need, but definitely do thorough testing (12~24 hours). Right now I'm more inclined to believe reviews and responses from people who cite diagnostics and sound technically proficient than the scores of 5-star entries that just say "Popped in the ram and all works great and it runs faster too!" (Nobody is going to notice a visible speed difference between 8 and 16GB... between 4 and 8, yes, I've used Activity Monitor and there is a small difference. But not between 8 and 16...)