I have an Acer veriton M261 and installed an ATI Radeon x300/x550/x1050 series card in 2010 only because the old monitor died and got a dell flat screen /19" wide screen so the Acer integral video device would make every look stretched . I also had to replace the power supply because to original died . It's now 450 watts . My main question is since I am still running XP Pro and as you know after years things build up and I wanted to go back to the factory set point and if I do I will lose the ATI Radeon drivers and CCC . I don't understand what the x300/x550/x1050 means other than perhaps screen resolution . I have it set at 1369 x768 32 bit color and it works fine. It's a dell 1360x768. I looked through the ATI site for the proper down load so I can save it on a thumb drive then down load once I go back to factory acer settings. I just don't know which download to use from their site and don't want to use the one that search's my computer. Everything works fine yet as time goes by it get slower when watching Netflix , it's fine for everything else.