You actually can´t crossfire an integrated graphic card with an HD6670, or any other card.
The best thing to do is to establish a budge, then make a new post, so that the Tom´s community can advise you better.
it says in the amd site it can.
AMD Radeon™ HD 6530D + HD 6670 = HD 6690D2
just want to know if it is worth it. thanks for the advice!