A PhII X2 555 can probably play most games; it's certainly better than nothing. You'll probably play newer titles on very reduced [CPU-intensive] settings, but it will play. As to the 512MB graphics card, we don't have enough information. If it's a GT240, GT430, or similar, you'll play any newer games on extremely reduced settings, if at all (depending partly on your screen resolution). Modern high-end cards have no less than 1GB, and most have 2GB or more; but really it's the model number we need to know, not how much memory is on the card.