Hello. I'm about to put the ole Dimension 8200 workhorse out to pasture and when doing an online build of the XPS 710 I noticed the AGEIA physX accelerator does not show up as being available during the build process yet during the build process of an XPS 700 I noticed the AGEIA physX accelerator ($249.00) does show up as being available. I'm thinking about building the XPS 710 system and would like to know if their is a reason why the AGEIA physX accelerator ($249.00) is offered on the XPS 700 build and not the XPS 710 build. Also I do like gaming and am trying to decide if I should do 2 or 4 gigs of memory.   Thank You.