did you ever do this? i recently updated my ts-469pro with 8gb of ddr3, a 1tb usb3/nvme cache... the only thing i haven't done yet is install the 4x 10tb drives. i might even go bigger, not sure yet. the rest of the system runs great, just trying to get the display to work a bit better. in this thread research about using a ts-412 as a ts469pro cold backup.