Well there are different types of integrated graphics. I'd say at least Intel 4500 or Radeon 3200. If you can, a HD3450 or HD4350 is would be better
I'd say for CPU, any athlon 64 x2, pentium dual core, or core 2 duo should do. Obviously, the better the graphcis, the better setting you can use. Also, what kinda of monitor are you using?