I have this Dell Inspiron 545 Minitower and I like to play computergames with high details. So I would like to upgrade my graphic card as various tests says that that is my problem. But it seems like there are a lot of things depending what graphic card my compouter can use and I think it is really difficult to figure it out preciously. I know my computer got a 300 watt power supply and also seems to have this PCI Express, but don't know about it is 1.0 or 2.0 (but have a guess that it is 2.0 as my computer is only 1 year old). On various sites it seems like GT 220, 240 and HD 5550 and 5570 are the recommended ones. But what of these are best for high resolution gaming? (playing on a 17'' screen if that helps here) Prices seems to be from 90 dollars to 130 dollars here (I don't live in America). But the HD 5550 one got 2 GB and the others got 1 GB so sounded best for me there, but really no clue in fact. But if any of the cards are superior I don't mind the 40 dollars difference so it's mostly if one of the cards got no difference or so.
Also if anyone got a tip to how to get the old graphic card out it would be nice.) Seen some videos on web and founded articles about how to do, but this computer seems not to have those screws inside so you can free the card. Instead it seems to be back on the case, but that 1 screw doesn't make the card get free in bottom and can't find any screws there.