He doesn't need a new CPU unless he wants to shout how many 3DMarks he can get!
My system scores just over 13k, but with a decent quad, it should easily hit 16-18k I'd guess.
Do I care, absolutely not, because in game it's fine. 3DMark is
synthetic and it is skewed massively to giving higher scores with a quad over a dual!
In the real world, there is barely going to be a difference between a dual and a quad
especially in (most!) games. OP don't worry about it, it's a fine score unless you want more 3DMarks!