Prior to SP1, I had to remove a 2gig stick in order to get vista64 ultimate installed. Once sp1 came out, I was able to use vlite (rc -have not tried with final) to slipstream SP1 so that I was able to install with my 4gig installed from the start. However, I have tried several combinations of vlite configurations that include slipstream then unattended, integrating updated drivers, etc. so that I could get a dvd burned that was configured the way I wanted it. I have not kept great notes on what worked and what did not, but in many cases, if I did much besides slipstream and perhaps a couple of mods in the unattended tab, the dvd that was created also resulted in BSOD when attempting to boot to it for a fresh install. Not sure if I have a touchy combination of parts, [Gigabyte GA-M57SLI-S4] [Diamond3850PE video] [Athlon64x2 6400+] [Corsair550vx PSU] [Corsair XMS2 4GB (2x2GB)] latest bios, FW etc. No bios settings to remap memory that I can find, nor a tech support at gigabyte that can answer a simple question. Anyway, I was able to get a simple sp1 slipstream done, and am happy that nuhi is able to provide something that microsoft would not allow.