Dell XPS 420 Upgrade, any problems, BTX PSU?

[xllsiren]

I have a Dell XPS 420, I want to upgrade the video card that came with it (Nvidia 8800gt) to a Nvidia GTX 285. I know that I'm going to have to upgrade the Power supply too because I only have a 425w power supply, which isn't nearly enough to power for a Nvidia GTX 285, but I heard that you have to get a special BTX power supply for BTX motherboards is that true or can I just use any power suppy as long as it is 24 pin???? Also any other problems I might run into, upgrading to a GTX 285???

Comp Specs;
OS: Window Vista 32bit Home Premium
CPU Type: QuadCore Intel Core 2 Quad Q6600, 2.4 MHz
Ram: 4gibs
Opitcal Drive: Blu-ray Player/ Dvd burner
Hard Drive: 500gb seagate
Video Card(GPU): Nvidia 8800GT
Power Supply: 425w
Display: Hp w2408 24 inch 1920x1200p

[DMB2000uk]

As far as I'm aware, BTX uses the same connectors, but is a different form factor (shape). So you should be able to plug up a decent ATX PSU just fine, but if it will fit in the area made for the BTX PSU securely is another matter.

Dan

[InspectahACE]

other than the psu..as long as you can physically fit the video card in place inside the tower you should be fine