Well, I'm looking into getting of this "Intel HD Graphics" mess and to a real card, but I'm not sure what all I'd need to upgrade as I believe I'd need a new power supply and such? I have an HP p7-1423w. Also, any suggestions for cards? Thanks! (If you need all my specs, I'll list them!)
Oh yea def a PSU. only comes with a 300 Watt PSU. After that its a matter of if the video card will fit in your case. some of the bigger cards may not fit in this case you have. So you may want to measure from the Back bracker (Where it screws into the case) to the front where the card drive is but take off at LEAST half a inch to plug the power cable in (Some have the power plug on the back)
Otherwise go ahead and get what card you want. It also support all 2nd and 3rd gen CPU"s as well.
The best graphics card you can install with a 300w PSU is either the Radeon HD 7750 or the GTX 650. The GTX 650 a little more powerful (by 8% ??), but since they are lots of rebates for Radeon HD 7750 card flying around, I have seen a HD 7750 1GB DDR5 card selling for as low as $65 - $70.
These are mainstream cards. Much better than the Intel HD 4000, but they will not let you max out graphics on a 1080p monitor unless of course it's an older game with relatively lower requirements than current games. At best I think you can get good performance for most games using medium quality graphics at 1080p resolution.
Your budget will determine what you can upgrade to.