3 Things to Know About the 2015 27-Inch iMac’s RAM Limit

Apple’s official 32 GB RAM limit is wrong The 27-inch iMac from 2015 can actually handle 64 GB of RAM, double what Apple advertises.

Use four 16 GB 1867 MHz DDR3 SO-DIMMs Installing four matching 16 GB sticks at that speed works without issues.

This is a real bonus for secondhand buyers If you’re buying a used 2015 iMac, you can upgrade to 64 GB for cheap, even though Apple never acknowledged it.