What graphics card can i get? HD4850?

Hi hi, i've just got a new pc but the graphics card, GT120, isn't too good and i can see this when trying to play games like Far cry 2.

Here it is first of all:

Intel® Core 2 Quad Q8200 (2.33GHz, 4MB Cache)
Genuine Windows Vista® Home Premium
4GB DDR2 memory
1GB NVIDIA® GeForce GT120 graphics

Anywho, i'm thinking of buying a better card but i have no idea which one, nor do i know how to install it (Although i did replace my older pcs graphics card myself with a x1950 PRO) I've heard the HD4850 is good.

My price range is £70-£150

And also, how would i go about installing it? I want to make sure i don't break my pc accidentally. Just information like how to uninstall my current graphics card/drivers, etc etc

Thank you

Yes, we need all of the info you can find on your computer. After that is sorted out, we can worry about the actual parts/build. You may also want to consider the 4770. Similar performance to the 4850, but it uses a bit less power.

Heres all the information i could find, if you could tell me anything else you need plus how to find it, i will.


Heres all the information from where i bought it.

* Intel® Core 2 Quad Q8200
* (2.33GHz, 4MB Cache)
* Genuine Windows Vista® Home Premium
* 4GB DDR2 memory
* 640GB SATA hard drive (7200rpm)
* 1GB NVIDIA® GeForce GT120 graphics
* Dual Layer DVD Rewriter
* 8x USB and 1x FireWire port
* Media card reader
* VGA / DVI / HDMI video output

Sorry for double post.

AC input 220-230V-.2 A.50Hz
DC OUTPUT: +3.3V--- 17.)A(ORG). +5V --- 18.OA(RED). +12V1 --- 8.OA(YEL)
+5Vsb --- 2.OA(PURP).-12V --- 0.3A(BLUE). +12V2 --- 14.OA(YEL/BLK)
P.G. SIGNAL (GRAY). GROUND (BLACK)
(+3.3V & +5V = 115W Max). Total output continuous shall not exceed 250watts

Packard bell, i got it from pc world. I cant take a picture sorry ;(