I thought I'd put together a little guide for people who wish to get SATA III on their 2009 or 2010 Mac Pro 4,1 or 5,1 which is also, crucially, bootable, with the option of having eSATA ports too. I will include how to get the power to these additional drives. I will be soldering the connections, but you could use term blocks instead. For the purpose of this guide, I will be placing a 3.5" HDD and two 2.5" SSDs in the second Optical Drive bay. What you will need Host card: Highpoint Rocket 640L Lite (£60) or Highpoint RocketRAID 640L Lite (£100) SATA III cables 100cm (£5 ea) Silverstone 5.25" to 3.5" & 2.5" Bay Converter £13 Power and Data extension cable (~£7) SATA Power Splitter (~£3) 2-Port SATA to eSATA Adapter Plate (£3) Booting & TRIM Now, the following screenshots shows the card in System Profiler when my Intel 320 300GB SSD is connected to it. It comes up as a AHCI Serial-ATA card running at 5GT/s Link Speed at x2 Link Width (I.e. 2x PCI-E v2), which theoretically gives us 1GB/sec bandwidth across all four drives. Actually, it is a theoretical max of 800MB/sec due to 8/10b encoding. This is still a damn site better than the 660MB/sec TOTAL MAX THROUGHPUT that the onboard ports can achieve. I.e. Even if you have 4 500MB/sec SSDs in RAID 0, you still only get 660MB/sec. I've never personally tested this limit, but have a search for this. Please also note that OS X says that TRIM IS ENABLED. IF it is or not is another question altogether... Performance I currently haven't received my new SSD (A Samsung 830 256GB), so these benchmarks show my Intel SSD using onboard SATA II and the Highpoint cards SATA III. Please note I ran the benchmark at different settings as the blocks written for a 4K frame against a NTSC frame are alot larger and hence you get better sustained speeds. Intel 320 300GB (Rocket 640L @ SATA II speeds) Intel 320 300GB (Internal SATA II) Samsung 830 256GB (Rocket 640L @ SATA III speeds) SATA 3 performance figures: Samsung 830 256GB (Internal SATA II) Transferring from Intel on SATA II to Samsung on SATA III: Installation Photos Two wires running along to the card. Fit perfectly through the hole here. It is like Apple wanted us to do this. Put the backplate on and the wires come out with the ODD power and data. Simples! 5.25" to 3.5" and 2x2.5" adapter full: All working perfectly!!!