I believe the XPS 420 has a 375W PSU,and what GPU have you orderd and what will you be using the computer for this would help gives us a better picture.

The graphics card coming with the system was the cheapest one available, I chose that because i want a better card, Its the 256MB ATI Radeon 3650 HD Graphics card, And i will be using it for the usual gaming, Movies mostly.

Not to fussed to be honest, Im just after a really good graphics card, Any suggestions are welcome and as long as they fit into the system im buying without having to upgrade any of the parts.

Are you fixed on ATI ? If not you can look at the 9800GT or GTX or the GTX 260 or 280

Well, After looking at a couple of sites people seem to be mentioning a 512mb radeon hd 4870, Not this one specifically, Will one of these be suitable for the system i am getting?

 

 http://www.dabs.com/productview.aspx?quicklinx=55H7

 

Anything thats close to this would be ideal.

I have seen in other threads where 420 owners are running either the 9800 gtx+ or the gtx260 with the 425w psu. They are big cards, but they fit in the 420.

Thats all the info needed guys, Thanks for the help, much appreciated.

Yes if you go with the GTX or GTX2 9800 series or GTX 260 you will proably need to upgrade your powersupply to the 425W if you stay with the 9800GT or GTX the 375w supply will be fine.

 

Yes you could just order a 425W supply from Dell if you want to run these higher end cards.

http://www.dabs.com/productview.aspx?Quicklinx=56Y8&CategorySelectedId=11137&NavigationKey=11137,4294963789,373340000

 

 http://www.dabs.com/productview.aspx?quicklinx=5695

 

How about these davet, Will these be suitable?

So if i was to purchase a 9800 gtx or a 260 gtx or any one of the cards mentioned and my system had a 375w psu delivered with it, Would it just be a case of replacing it with a 425w psu.

If you're going to go with the GTX 260, you need a power supply with 500w. If you decide to go with the GTX 280, you need a power supply with a minimum of 550w.

Ok cheers for the advice PH3N0M, Much appreciated.

Definitely worth it. With a 375w psu, you are very limited as to what you can put in your case.