i cannot find the correct specs for the sata speed of the optical drive on imac 2010 21.5 EMC 2389.
Some say it's Sata II (3Gb/s), other say it's Sata I (1.5Gb/s).
i know that the hard drive is Sata II so Depending on the info i would consider swapping the SSD for the HDD slot and puting the SSD in the optical drive slot.