Are you upgrading from Windows XP to Windows 7?
Are you attempting to increase the performance of the XPression software?
Or are you adding RAM to run more programs on the XPression? (ex. Adobe Photoshop).
Adding more RAM will not increase the performance of the XPression software unless you are upgrading from Windows XP.
If you really want to increase performance without buying the newest hardware from Ross you should upgrade the NVIDIA card (this can potentially void your hardware warranty depending on what hardware failures you encounter in the future).
#XPression