Would This Work?

[Shockotic]

I have a Gateway DX4860 and I really need to upgrade the graphics But not sure if it'll fit or if there will be enough power in the Power Supply.

Computer Specs:
Intel CORE i3-2120 3.30 GHz
1TB Hard Drive
6 GB DDR3 RAM
Windows 7 Home Premium 64 bit
Intel HD Graphics

*If there is anything else you need to know, just say so.*
I am looking for something along the lines of EVGA GeForce GTX 660 FTW or Gigabyte GeForce GTX 660 OC 2GB GDDR5 or Galaxy GeForce GTX 660 GC 66NPH7DN6ZVZ
But not sure how it'll fit in the computer. If there is anything else that would be better for power/price but good performance please say so.
Also, how can I check my Power Supply's Wattage?
*PM me for a bigger list of Graphics Cards*

 

[iTwe4kz]

Rather than looking this stuff up myself...just look up what type of connections your mother board has and what type of connections the graphics cards you want have. If they match, great. Also, check for compatibility issues. I'd look, but I'm just way too lazy at the moment :-/

Also, the easiest way to check power supply watts is to just open up your pc and hopefully you'll have a sticker on there that you can see.

 

[Shockotic]

The problem is, I don't know what kind of motherboard it is. :/