As they are, they are using the old award bios which means on that particular board the highest you can set the multiplier to is 36 (or 38 can't remember exactly). So max OC would be 3.8ghz.
I got the B-grade board (rev 1.0) and it comes with the latest F8 bios and according to its CPU support list the 3570K is supported.
Beware though the B-grade board that I got is the bare board only no accessories included, no I/O shield nothing except the board in the box itself.
Z68 - GA-Z68AP-D3