Hi Everyone, My poor old MP3.1 seems to be labouring especially now with El Capitan so I thought maybe I should start by upgrading to SSD's? Below is how my Mac Pro is at the moment with my installed HD's as follows: Bay 1 Western Digital Black WD6401AALS 640GB (Running Windows 10 and all other software) Bay 2 Western Digital Black WD6401AALS 640GB (Running El Capitan and all other software) Bay 3 Western Digital Green WD10EZRX 1TB (Used for Windows 10 backups) Bay 4 Western Digital Caviar 3200KS 320GB (Time Machine Backups) External USB Western Digital Elements 500GB (Time Machine Backups) The questions I have regarding this are: Should I purchase smaller capacity SSD's use them for just the operating system and store everything else ie photos, movies and music on existing HD's? Any additional software i.e. games etc should that be installed on the same disk as the operating system? Is it worth spending out in the latest top of the range SSD's? If anyone one has any suggestions I'd love to know and many thanks in advance!