Replacing graphics card + grounding myself?


Dec 17, 2012
Hi, I'm going to be purchasing this computer during boxing day sales:

I have a number of questions:

1) I'm not sure if I should replace the graphics card, I don't know if it's good enough for the games I want to play. (Cod4, Minecraft, League of Legends, and possibly some other FPS games).

2) If I need to replace the card, what do you recommend? I want to be able to play on high settings with a smooth frame rate.

3) Will I need to purchase a power supply for this card? Which?

4) Overall, do you guys think this computer would be good enough for these games after I upgrade the GPU?

Please just let me know if the card will need to be upgraded or not. I'm not looking to run 200 FPS or anything, just around 80.