i have a fairly weak gfx card, and 400W wasnt enough for it. So i got a 500W one and its barely enough according to my cousin. So you might want to get a new one, but gfx cards are different, my cousin also said that the card i bought (8800GTS 320mb) to power is like a Hummer to petrol. Which means it wants a lot, a huge lot. For RAM u should get at least 4GB, maybe buy 2x2GB.
Yes, and XP only allows 3.5 GB, rest is only ''decoration''
As i said i dont want 4GB, and super graphics card.
Running GTA IV i would be VERY happy (lol)
And im nor rich, i have 200-300€ max.
Like I said, that PC won't run any games 2008+ very well (GTA4 would startup then lag like crazy). XP does allow more than 3.5GB if you have a 64 bit operating system, by the way, if you're going to get a new PC why would you use an old OS like XP? You should be building a Windows 7 PC seeing as how XP is 2 generations behind and is nearly a decade old. Anyways, your budget is extremely low for a gaming PC so don't expect to be able to get anything new and amazing. You will be able to get something that will run SA fine and the older Source games, but games like Modern Warfare 2 will run like shit and you would be lucky to even get something like Left 4 Dead to average over 20 PFS on low.