So if you do not have SATA3 and are stuck on SATA / SATA2 but do want to maximize SSD performance, OWC might have the answer for you, at the expense of a PCie slot though. Other World Computing announced the Accelsior S, a new PCIe card with direct mount support for a 2.5" SATA 6Gb/s SSD. 

The latest addition to OWC's award-winning Accelsior line enables PC, Mac Pro tower and Thunderbolt interface expansion chassis users to quickly and easily add additional storage. Utilizing the robust PCIe architecture, the Accelsior S card offers both storage expansion and 6Gb/s speeds up to 550MB/s - more than double the performance of SATA 3Gb/s.

When equipped with the Accelsior S PCIe card and an SSD, Mac Pro tower and PC users can launch, capture, render and process I/O-intensive apps without long wait times. The Accelsior S PCIe card is also extremely easy to install - no drivers or software are required.

Performance Plus Reliability
Backed by a 3-year limited warranty and OWC's award-winning US-based 24/7 technical support, OWC Accelsior S cards have been developed to deliver consistent reliability well into the future. The OWC Accelsior S is custom-engineered for use with PC, Mac Pro tower and Thunderbolt interface expansion chassis.

Availability
OWC's new Accelsior S PCIe Card is now available for same day shipping from OWC. For more information on the OWC Accelsior S, visit this page.