If you do decide to upgrade your graphics card you must first think about the basics:
Does your current computer power supply look up to the job? i.e. does the wattage (and amperage) cover all your computers needs for an upgrade?
Have you got enough free PCI-E ports on your motherboard? (prettymuch all good graphics cards and 'high-end' graphics cards run on PCI-Express 2.0 X16)
Do you have the right type of Ports?
If you do a search on YouTube you will get 1000's of useless videos on pc upgrades, with the odd occasional 'gem' that you are looking for.
PC world and Currys are pretty much useless for upgrades as well, due to the limited range of equipment (which is sometimes in-compatible) that they sell.
First things first:
Start with manufacturer websites, e.g.
nVidia and ATI
Then go further and look at card manufacturer websites, e.g. msi, Gigabyte, EVGA, Gainward and OcUK for
'NVidia cards'
and also:
XFX, Sapphire, Asus and HIS for
'ATI graphics cards'
As a comparison between card types I use suppliers such as Overclockers UK, because they list card types from top to bottom down the left side of their website:
(
http://www.overclockers.co.uk/productli ... 1&catid=56)
The best/most powerful cards that produce the best graphics generally have the highest numbers beside the product name.
Different people have different views on which is best, ATI or nVidia. All you need to worry about is finding a card that suits your
budget and at the same time,
is compatible with your existing hardwear inside your computer.
Always try to find the manufacturers guide or manual for the type of equipment you are looking at before you buy or sign for anything. Some retail outlets have been known to give the wrong information out! so you don't want to throw your hard earned down the drain for useless hardwear.
Check everything upto and including the product dimensions.
Lastly, try to source some good reviews or install videos on YouTube of the exact product you eventually decide on, so that you can see what it is you are looking at before you buy.
P.s. Make sure the graphics card you purchase has enough Amps provided for it on your PSU's (power supply unit) +12Volt rail(s). Otherwise it's pretty much useless to.
Hope that makes some sense! don't rush into anything and take your time.
Regards
Chris.