Wrong frequency of pentium 4 2.8 processor on socket 478. How to find the reason?

Question

Iron

In general, I installed msi mc-6787 + pentium 4 2.8, I installed it and turned on the BIOS frequency at boot 1.4 shows. well works normally delivered to the person.
After some time, I took another pentium 4 2.8 + mc-6787, the situation is the same. I think I didn’t take p4s533-mx well and it’s also often the same. I put the same processor in ga-8ipe1000-g and everything is fine!
Everything would be fine, but I need to assemble two more computers, and I have one asus ga-8ipe1000-g and three as many as msi mc-6787.
In general, tell me who has what assumptions and where to dig.