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#11
There's a separate listing on the Upgrade Advisor for 64 bit compatibility. Did you observe that?
Did the advisor flag your 965G graphics? There are no Win7 drivers for it. (It's possible to use the XP drivers. It's possible to run Windows 7 without Aero Glass, but it's a bit less pretty.)
As another poster remarked, the GX270 is available as a small form factor, dektop, or mini-tower PC. The SFF version takes a maximum of 2GB of RAM, That's within the minimums for X64, but few would install a 64 bit OS on a machine with 2GB of RAM.
I recently switched to X64 on my (cheap, 2008) laptop at 4GB, but I did that because a specialized application that I use for work had a 32 bit version that had serious bugs under Windows 7 X86 (32 bit). Its 64 bit version is OK under Win7 X64.
It's possible that you could install X64 on the GX270, but it's probably not practical.