...Also, I read on another forum (forget which website, sorry) that if you downgrade this machine to Windows XP, that SLI will not be supported due to some sort of conflict with the nVidia 650 Motherboard. Can anyone confirm?...
I can verify that SLI works on my Windows XP partition. I was playing Crysis Wars on XP with my dual 8800 GT's SLI'd just last weekend. (GeForce 185.85 driver)
However, I have not reformatted (only resized) my original XP partition, so I can't help with nLite or the SATA drivers.
If you need a working partition while you're experimenting with the XP downgrade, you can still get the Windows 7 RC
. The Windows 7 RC install to a separate partition was very easy and it had no problems recognizing my 500 GB (non-RAID) hard drive.