I'm upgrading a Dell Optiplex with Pentium D and a Radeon X600 video card. I got a new Asus X1300 and when installed the computer turns on, all the lights come on and there are 3 beeps and the machine shuts down and then the computer turns on by its self and goes through the same routine and will keep doing it until the cord is pulled. I installed the new card in my desktop and it works perfectly. Dells site shows this card as an upgrade for the Optiplex so It should work . Thanks