16GB (8GB x 2) 1867MHZ DDR3 SO-DIMM PC3-14900 (OWC1867DDR3S16P)

Compatible iMac model:
iMac w/Retina 5K display (27-inch Late 2015) (October 2015) Model ID:iMac17,1 | 3.2GHz i5, 3.3GHz i5, 4.0GHz i7

Product Specs:
Technology: DDR3 SO-DIMM
Density: 16GB (8GB x 2)
RoHS: Yes
Pin Count: 204-pin
Op. Temp.: 0C to +85C
Data Rate: DDR3-1867
Speed: PC3-14900
CL: 11
Cycle Time: 1.875ns
Voltage: 1.35V
ECC: Non ECC
Module Ranks: Dual Rank
Register: Non Parity
Low Noise 8-Layer PCB
Meets and/or Exceeds Apple/Intel Specifications
Fully Compliant with JEDEC specifications
RoHS Certified