64 bit chip

Theoretically yes, if you run Vista 64bit, I found that applications like Office and IE opened quicker using x64 Vista over x86 Vista ( Office is a 32bit application and IE7+ was a 64bit version of IE ), but it was just eyeball obsevations, not noticed at speed comparison tests done as yet.

Sad thing is as yet not many applications are fully written to take advantage of 64bit CPUs, Photoshop CS ( more memory allocation routines to take advantage of the 64bit OS and 3gb+ of ram ) is one I know of but you still need to run a 64bit OS to take advantage of that increase in speed or memory allocation routines.