I'm in the market for a gaming laptop, and have nearly decided on the Dell XPS M1730 with a T9300, 4GB RAM and dual 8800M GTX 512MB SLi. They offer a choice, either Vista Home Premium or Vista Ultimate.... both 32bit. I would like 64bit so that all my RAM gets recognised. I chatted with one of their reps on their site asking him if I could have a 64bit OS installed (against payment if necessary), or if not possible whether I could purchase the laptop without any OS - his reply was sorry, the XPS 1730 is available for sale only with 32bit Home Premium or 32bit Ultimate. He told me if I wanted a 64bit Vista I had to purchase a business notebook (so they have 64 bit Vista available!). But obviously they can't do raid0 and replace the quadro gpu with the 8800's for that laptop. So I thought okay, I'll think about it and I might decide to go for it (XPS 1730) then purchase a 64bit Vista from here and replace the OS. But now I'm afraid of buying this notebook. If Dell have the option to install 64bit OS's on other Dell notebooks, why do they absolutely refuse to do so on the XPS 1730 even against further payment? I tried other online shops all around Europe - their reply was that the OS is installed by Dell and they can only sell what Dell ships to them. (Obviously even local shops gave me the same answer, apart from that they quoted the price of €4425 for the same specs, which made me totally exclude a local purchase!!) I was talking to a friend and he told me that the chipset of his laptop (not Dell) resulted to be faulty - he bought 64bit OS and found that still ~3GB RAM was recognised due to this fault in the chipset. Basically I'm thinking Dell is hiding something... Otherwise why put 4GB Ram in a system only to cripple it with 32 bit OS and adamantly refuse to install a 64 bit OS?