Chosen Solution

I would like to have 2 SSD and 1 HDD installed inside the iMac, is it possible? what cable do i need to do so? thanks

You could also swap out your optical drive for a 2.5” drive but the optical drive port is only SATA II (3.0 Gb/s) unlike your HDD & Auxiliary port (SSD) SATA ports which are both SATA III (6.0 Gb/s).