RAM for iMac 27 with 5K Retina display (late 2014)

Hello folks :)



I have iMac 27 with 5K Retina display, but inside i have RAM 8Gb only, and i wanna upgrade my mac to 32Gb RAM :)



Please help choose RAM Corsair, i don't know what kind of ram need exatly, ddr3 (1,5V) or ddr3l (1,3V).



I did want bay corsair mac memory 32gb x4 (8Gb), but seller told me thats for new model of mac need another RAM.



What memory to bay?



Thanks, and plz help me choose memory for imac 27 late 2014 with 5K retina display :)



Best regards

Michael