tl;dr version: Would you suggest a single large SSD, or a RAID setup? With RAID, would you suggest a internal or external setup? Finally, with RAID, do you need anything in addition to run it, other than a PCI-Express eSATA card for an external setup? After the recommendations of people of this forum, I have decided to stick with my Mac Pro (early 2008), even with the outdated CPU architecture. So, I think it's time I gave my Mac Pro a bit of an upgrade in the HDD/SDD department. Right now, I am using the following setup (full specs are in my signature): Internal Drives: HDD Bay #1: 750GB Serial ATA 3Gb/s; 7200 rpm; 16MB cache (System + Media Drive) HDD Bay #2: 1TB Serial ATA 3Gb/s; 7200 rpm; 32MB cache (Sample Instrument Drive) HDD Bay #3: N/A HDD Bay #4: N/A External Drives: 1TB HDD USB (Time Machine Backup for HDD Bay #1) Now, not only am I running out space for all three drives, but I would like to improve the speed of my sample drive. That, and I need to backup the Sample Instrument Drive sometime soon. While a Solid State Drive would be a great improvement for the System, they're pretty expensive at the moment, and nowhere near the size I need for the Sample Drive... so I was considering getting a RAID setup for the Sample Drive. Would you go with an internal or external RAID setup? For internal, I could perhaps use the 1TB HDD all ready in use as one of the HDDs, and purchase an additional internal HDD. Then, I can back that up with an external HDD, and have the last bay fitted with a small SSD for the System... I have no idea if that would work or not. Does the Mac Pro 2008 even have an internal RAID controller? Alternatively, I could go with external... I could purchase the following combo from OWC: http://eshop.macsales.com/shop/esata/Elite-AL_Pro-RAID_Ready_Dual-Drive Which leaves room for a SSD, and perhaps one more HDD for media that doesn't need backed up (eg Steam games, etc). Does the OWC combo card include a RAID controller? I'm not even too sure what a RAID controller is to be honest. Phew! Sorry for the long thread. Congratulations if you read it all: I just have a lot of options, and am not sure how to go about it all.