The Gateway 420GR is a Pentium 4 tower desktop computer. It features the Intel GMA 900 Dynamic video memory technology 3.0 which is quite outstanding. Although it comes with a default memory of 512 MB, it can be upgraded to a maximum of 4 GB. The beauty of the Gateway 420 GR is that it leaves a lot of space for upgrading. If you do not like the default specifications, you could always add. It is a durable desktop computer and the best bet when you a looking for a low end computer to begin with. It’s the best among its peers in the same product range. The first thing you would however have to do after making the purchase is installing all the Gateway 420 GR drivers which are available here.