Hi, I currently have Plextor M5 Pro SATA3 SSD capped by my 5.1 Mac Pro SATA2 speed. Speed is like 250mb or something. 2 questions: 1) I only care about boot up speed, app loading speed and don't really care about transferring data. Would there be a lot of differences in speed if I upgrade to SATA3 PCie blade (1200mb speed)? Theoretically it should be 5-6 times faster. 2) If I were to upgrade to PCie, I need to install it only into my leftover PCIE slot right? Is there anyway to upgrade all my current SATA2 cable to SATA3 so all my HDD bays can benefit? Thanks.