
You will also probably need to upgrade your graphics card.Īccording to this Apple article to need to first be running at least Mountain Lion (10.8.X), before upgrading to High Sierra. However, according to this Apple article, you need to first be running at least High Sierra (10.13.6). Also, be aware that this 32GB max is reported only to work with the i5s and i7s, not the i3s or the older Core 2 Duo processors which max out with 16GB Ram at 1.5V setting.According to, the latest version of macOS for your Mac is Mojave (10.14.X). So look up the serials on the manufacturer or vendor website that lists the specs and go from there. In this case, the 1333 Mhz speed is what is reported. Issue is not with higher speed memory which just defaults down to the lower speed that the BIOS supports. Samsung, like Crucial, Elpida, Kingston, Corsair, etc all make good memory, but even the best memory will not work if it is does not support the correct voltage type. So, some people will report Samsung as working, and others will say it does not. Trick is to make sure the memory you get supports 1.5V as most of the newer memory is lower voltage (eg., 1.35V or 1.2V) that is NOT SUPPORTED by the iMacs older than 2013.

Memory under "About this Mac" is reported as "32GB of 1333 Mhz DDR3." Therefore, not reported as its native 1600 Mhz. Was able to install four (4) mixed serial 8GB SO-DIMMs of Samsung PC3-12800 (1600Mhz) DDR3 SDRAM memory modules (Samsung Memory sticker IDs listed as M471B1G73DB0-YK0 1338 and M471B1G73CB0-CK0 1251) in a Mid-2010 27" iMac with an Intel 2.93Ghz i7-870 processor.


Here's some relevant information from Crucial on memory speeds (emphasis mine): You could add the 1600 MHz memory for your MacBook Pro even though it's designed for a slower memory (1066 MHz) - it ought to work, but you'd be better off buying from a place that accepts returns.
