I'm a new sim player with a graphics question

[AaronEdmondson84]

I was looking at the cards you suggested and I was wondering how to tell if they are compatible with my computer, so many options.

I noticed that my card specs says that it is a PCI Express 2.0 x16 bus interface

Does that meen that ANY graphics card with that spec will work in my comp or does the whole DDR3 or DDR4 thing meen something too. I know I want a 1GB card. and if I gotta spend alil over 100 bucks thats cool with me.

You asked about what resolution I plan to play. I really dont know what that meens. sorry I do have a 23 inch monitor so I want full screen and want the game to look real good. is $150 - 200 more of what I am looking at? or is the HD4850 1GB at a $115 gonna be sweet?
THanks for the reply!