I purchased a MD7820u Laptop for $599.00 as advertised with 4gb of DDR3 memory and an ATI RAdeon HD3650 Graphics card. But actually the MD7820u ships with $GB DD2 memory and an Intel GM4500HD Graphics chip. Have contacted Gateway and they say that I need to deal with OfficeMax to resolve the issue. OfficeMax say they willnot except open box for return. Also would like to mention that this is not the only error the MD7822u, MD7826u, also report different specification.
See Link http://forum.notebookreview.com/showthread.php?p=4393833
