I have two Samsung 850 pro 256gb drives. When I first installed them I was seeing 11-1200mb/s read speeds. Recently I got an error from Intel rapid storage. Said that one drive had failed, I unplugged the drive. Took them all out of raid and installed Windows. Samsung magician said they are fine and both plugged in as SATA III. Ran crystal disk mark and got 550ish mb/s from both drives. So then I set back up the raid array and installed Windows, Intel rapid storage is reporting it all fine. But one of the two drives reports as SATA II while the other says SATA III. My read speed is right around 700mb/s at the moment. Setup for RAID0 128kb cache. Now if I turn the rig off and swap the ports that the SSDs are plugged into, the opposite drive reads as being SATA II.... I tried all four ports on the board, I always get one drive as SATA II. That's not how it used to be, i know that for sure. I have changed the cables as well, same results. Anything I missed that I should try? Because at this point I'm thinking boards messed up.