um.. yes he does, and yes it is
the minimum CPU speed for that game is a 1.2GHz processor, a 1.8GHz processor is well above the minimum. it may not play it as well as the recommended 2.4, but it can indeed handle it.
also, that CPU speed spec is relative to intel processors only. AMDs have equivilent performance at much lower clock speeds. i don't know what his processor is (and I don't know where you saw that he has a 1.8GHz either
). but if he has an Athlon64 processor at 1.8GHz, then it is well above even the recommended 2.4GHz spec.