Yes it's a Dell my mother board model is: 0CU409
And I have no idea how many watts my power supply is.
@Hilo122 I plan on doing very light gaming to some medium gaming, nothing like BF3 or Halo 4.
You have a Dell Vostro 200? A slim one or Mid tower ?
Well according to some specs, your motherboard does have PCI-E 16x, and 2 slots of DDR2 memory but I really don't know if your Pc can handle a GPU, or how bad the bottleneck will be.
I think the only gpu's your PC can accept is the HD radeon 4000 and 5000 series, but again I don't know exactly the performance of the Celeron 420 with those graphics cards.