32GB Kit ( 4 x 8GB Modules ) DDR4 2666/2667 MHz ( PC4-21300 ) DDR4 SO-DIMM ( 260-Pin ) Non-ECC Unbuffered Apple Mac Certified Memory RAM Upgrade Designed For Select Apple Mac Systems: iMac (for a complete list of compatible systems, see the description section) Compatible Apple Order Numbers: MRQY2LL/A / MRR02LL/A / MRR12LL/A / MXWT2LL/A / MXWU2LL/A / MXWV2LL/A Compatible Apple Model IDs: iMac19,1 / iMac20,1 / iMac20,2 Compatible Apple Model Numbers/EMC: A2115 / A2115 (EMC 3442) A-Tech provides a Lifetime Warranty for all orders & offers complimentary United States based Tech Support before, during, & after your purchase