Which is better to run on the Dell XPS 8700

fireboy1

Honorable
Sep 28, 2013
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I just bought the Dell XPS 4th gen I7-4770 3.4GHz / 8 core with the Nvidia GT 635 GPU
I am running win 7 Pro.
I already have a new Sapphire Radeon HD 7790 OC 1GB DDR5. New still in the box.

My question is which is the better GPU and if it is the Radeon is it even compatible with my system?
My second question is I would like to also dump the DVD/RW that came with it and replace it with 2 other DVD/RW one is Light Scribe capable but I don't know what to choose for the second one. I intend to use the light scrib purely as a dubbing drive.
I would like to get into games such as Tomb Raider and games along those lines.
I know I will need a new PCU as well and was thinking of a 650 watt would that be enough or would I need a bit more power than that?
I do appreciate anyone's help so please chime in.
 

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