I just bought both of the products(2500k and dp67bg). Updated my bios to the latest 2111 and it wont
overclock.
This is my first Intel motherboard and am having a Very Bad experimenting with it.
Welcome to the Forum Mohammed, and Yes this last BIOS didn't work to Overcloking, by BIOS or Windows.
There is alot post about it, I hope that Intel saw it
Intel will see experiment and not experience.
I Downgrade BIOS to 2040 by this guide
http://www.intel.com/support/motherboards/desktop/sb/cs-023360.htm
the ( Recovery with CD-ROM ) method worked for me
OC to 4.5 - tested with prim95 all looks good