I got an SSD, and while benching the drive I started to bench the other drives. I have 2 x 1TB SATA2 drives in software raid 0 (D), and 1 1TB drive (C) that has the OS and apps, etc. This is on a Sabertooth X58, using the Intel SATA2 ports. Bios is set to AHCI, and I'm using the MS AHCI driver. Jmicron and Marvell controllers are disabled. Benching the drives individually, D gets around 125MB/s. C gets 115MB/s. Now, using perfmon I monitored the transfer rates when copying between drives, they top out at 145-150MB/s total. 75MB/s read, and the other drive does 75MB/s write. So my understanding is that the bandwidth isnt shared, so each port should get close to 280-300MB/s, and the SSD does on the same controller. So copying between any two drives should be at around 115MB/s per drive, or around 230MB/s aggregate. Its almost like the mechanical hard drives are using a SATA1 controller instead of SATA2. Can anyone think of what might be going on?