Good question about the SATA controller being recognized as SCSI in Windows, that has happened with some beta drivers as well.
I would not use IRST 11.5.0.1207, it was just removed from the download page of the Intel 7-series chipset boards (excepting X79, which uses RSTe) and does not perform as well as 11.2 drivers. I noticed this around 8PM CST on 8/2/12. IMO, IRST 11.2 or earlier versions are fine.
There might be a new driver that is being rolled out since it seems 11.5 may be history. I've seen claims that SCSI drivers do not pass the TRIM command to SSDs. You can install earlier IRST drivers over 11.5, just skip the warning about installing an older driver.