If you end up installing a hdd caddy, make sure you put the SSD in the main hard drive bay. Sometimes manufacturers cap optical drive SATA speeds to 1.5Gbps since optical drives dont need the extra bandwidth. While this is a huge inconvenience for the end user which only saves the company a couple pennies, at least your mechanial hdd won't be nearly as bandwidth starved on the slower line as an SSD would.
Main: i5-3570K, ASRock Z77 Pro4-M, MSI RX480 8G, 500GB Crucial BX100, 2 TB Samsung EcoGreen F4, 16GB 1600MHz G.Skill @1.25V, EVGA 550-G2, Silverstone PS07B
HTPC: A8-5600K, MSI FM2-A75IA-E53, 4TB Seagate SSHD, 8GB 1866MHz G.Skill, Crosley D-25 Case Mod