I recently purchased a PCI Express SSD http://www.newegg.com/Product/Product.aspx?Item=N82E16820227598
card for a client. I had to load the drivers for this SSD before I could load Windows 7. Once I loaded Windows 7 I didn't seem to notice any speed difference, nor did my client. My Client uses Photoshop and Lightroom and is complaining of slow opening, and modifying speeds when working in Lightroom compared to his normal hard drives. His machine is a Dell Precision T5500.