Dear Users, a photographer asked me to improve the performance of its Mac Pro. Its current configuration is: Model: Mac Pro 4.1 CPUs: 2x 2.6 Ghz Xeon RAM: 6Gb DDR3 ECC 1066Mhz Hard Disk: one 640Gb Software: He uses only LightRoom and Photoshop; My idea is: Upgrade the RAM up to 16Gb Install SSD unit only for System/Programs (120Gb) Install 4x 2TB Hard disk in Raid 10 software (Seagate Barracuda), total 4Tb. Currently I don't want to ask him to spend 500+€ for the RAID card. I need performance and reliability and, in my hones opinion, is better and less expensive to buy four hard disk in RAID 10 software (4Tb) than three hard disk in RAID 5 hardware. Anyway, your opinions are welcome. Now I have a couple of questions: 1) is it better to install 8x 2Gb RAM modules (is it faster?) or 4x 4Gb (which would leave 4 slots free for future expansion)? 2) more important.... how to mount the 5th hard disk? I mean the 2.5" SSD drive? Somewhere under the optical unit, with some adapter? Will I be able to boot from it? Thank you in advance for your kind attention. Cheers, Mario.