Actually, I just assembled a P6T and did not install any s/w drivers.  I set the BIOS to RAID, then save/exit and saw at the next screen to (quickly) press control-I.  Then say RAID 1.  I installed the Windows 7 RC (turned out to be ultimate 32 bit).
Yes, the book said something about installing RAID s/w for XP, Vista & later.  But the drivers disk would not load, something about OS not supported.  So I drilled down to install the ASUS Express Gate (instant on Linux access) and tried to install it.  Same error message.  But then a "compatibility box" or some such appeared, and it installed.
I suppose I could try that with the RAID drivers, but they appear to be working as is.  Maybe the mb-W7 combination eliminates the need for more.  C: shows as a 465GB disk.  I installed 2 SATA 500GB HDDs.  D: and E: are the two optical SATA drives.
ON EDIT:  On reboot, I discovered that the Express Gate was not installed, even though the "compatibility box" said it was.  Oh well.  Does not bode well for my accounting s/w playing well with W7.