Need some help deciding on a graphics card

I plan to upgrade the GPU on my Dell XPS 420.

Upgrade 1: GeForce 8800 GT to a Radeon HD 4870 1GB
Upgrade 2: GeForce 8800 GT to a GeForce GTX 285 1GB
Upgrade 3: GeForce 8800 GT to a Radeon HD 4870 X2 2GB

Which upgrade(s) would i be able to do with this setup assuming i have an ample power supply and budget is not an issue?

How would i do any one of these upgrades? - I know how to physically install it but what about drivers... do i uninstall them, get the new drivers, then put the new card it? What would the steps be?
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  1. Your PSU is too weak @ 375w. The best upgrade would be either the HD 4670 (47w) or 9600GT (60w).

    Best guess, you will need to upgrade to a 650w PSU for the HD 4870x2 which uses about 265w alone under full load.

    The GTX 285 uses a little over 160w.

    The HD 4870 uses about 130w.

    All those wattage for the GPUs is assuming you are not overclocking them.
  2. For the x38 chipset, u shuld go the ATI way...sure those mobos support crossfire...
    So go for the 4870X2 if u want to upgrade at once...else go for the 4870 1GB...and then add another later...
  3. jaguarskx : ¨Your PSU is too weak @ 375w. The best upgrade would be either the HD 4670 (47w) or 9600GT (60w). ¨

    I think that the OP meant an upgrade, he has a 8800GT right now, how will a HD 4670 or a 9600GT be an upgrade?
  4. Thanks for the help so far, but does anyone know how to perform an upgrade like this - is there a guide somewhere or video anyone may know of?
  5. What resolution do you play games at? At 19" (widescreen or standard, doesn't matter) your 8800 GT should be a pretty good contender in most games at the native resolution.

    If you have a bigger monitor, I'd say the 4870 1GB is a great upgrade. I have the 512MB version now on a 24" 1920x1200 monitor, and I can max out most games. The extra VRAM would definitely help with the higher resolution and increased levels of AA/AF as well as allow for higher settings in GTA IV (stupid VRAM limits...).
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