His old pc is a 667mhz one!!!
I would suggest at least 512MB ram for light gaming, 1GB for moderate gaming, and 1.5GB - 2GB for heavy gaming. You will notice lagging with that memory. I do have to say that it is a lot better than your current rig .
ok the ram is ganna be more sence it is the same as my computer now. i can pull the 256 out of this and have 512 in the new one
and so you knwo thats not the power supply im getting.... me and rik found a way better one.