Review on 💾 Premium 32GB (4x8GB) DDR3/DDR3L 1600MHz PC3L-12800 SODIMM Memory Upgrade - Compatible with Mid 2015 Retina 5k, Late 2014 Retina 5k, Late 2013, Late 2012, and Mid 2011 iMac - 2Rx8 CL11 1.35v RAM by Raymond Doe

I installed both cards in my Mac Gf mid 2010 and it wouldn't boot with both 8gb cards just a beep then I went online to get one Finding a solution, and only found that the Mac is limited to 8 gigabytes of memory, and I've tried installing twice that much. So I left an 8GB card with the 2GB card it came with and it booted. It says I have 10 gigs now. I've noticed an improvement as I cycle through the images, but loading times are still a bit slow. Now I only have an extra 8 gig card as a backup.