I am not sure where you got this information, but it is incorrect. The DH67CL and the DH67CLB3 are identical ATX form factor motherboards. They differ only in the version (stepping) of the chipset that is used. The B2 stepping of the 6 Series Express chipset had a flaw that could result in disk corruption. When this issue was uncovered, Intel re-released the CL board as the DH67CLB3 to differentiate it from the original (which had the B2 stepping). If the board you received has this flawed chipset stepping, I think you should return it.
Intel released a tool that you can run to test if you have the flawed chipset stepping. I cannot find it in the downloads area. I have a copy of it if you need it (send me a private message containing your external email address if you want me to send it to you)...