asking it agin - it's very important : have you installed the latest Bios version for your mobo ?
your mobo has a old chipset which is not meant to OC modern cpus though the cpu can run fine at stock speed you might not be able to OC the cpu like others did and there's no guarantee every cpu ( even if they are from same series ) will OC equally.
BTW, do post a HWmonitor ( download the app and run it ) Screenshot