24GB of DDR3 1600 MHz RAM. iMac "Core i7" 3.4 27" (Late 2012) 3.4 GHz Core i7 (I7-3770). iMac 27" Late 2012, Model No. A1419, EMC2546. Complete iMac "Core i7" 3.4 27" (Late 2012) Specs. Has no effect and cannot be seen unless you know it's there and look on the right angle and light.
