Bought for a 2017 iMac 27" 5k. Works perfectly.

Arrived next day, worked perfect. Great service thanks

Excellent RAMs. Work as a charm. No incompatibility issues like the others.

All worked as it should when installed on iMac, so gives me total 40gb of memory now paired in slots 1/3 and 2/4 with original Apple 2x4gb modules. Braw!

It's really fast, no problems getting it to work and if I need more ram I'll get this exact one