Alright, think I've figured a few solutions for my iMac i want to upgrade/configure. The goal is to keep it as quiet and cool as possible, with less mechanical parts as possible. Just getting a few opinions that others may recommend. Option 1 - Awesome, but not ideal 4TB+960GB SSD Fusion Option 2 - Attractive - remove HDD, add HDD power jumper, remove Apple OEM SSD, replace with 960GB SSD, less mechanical parts is the goal. Option 3 - Next best, concerned with SATA speeds. Remove HDD, replace with HDD power jumper (keep fans normal), remove OEM SSD and Optical drive replace with 2x960GB SSD RAID 0 - fast, quiet, cool, no moving parts sans Fans. only problem with Option 3 I have is will the SSD on the 6Gbps sata connector slow down to match the SSD on the 3Gbps SATA channel in a RAID 0 config? Will have thunderbolt storage with a 4TB Pegasus.