CPU_Z should get a good read of your current RAM:

CPUID

Have you tried using it in either slot?

Also is your graphics on-board or do you have a graphics card?


In the long run if you can match that stick you have you should have no problem using another one just like it. Mixing speeds and brands is not a good idea.

That being said the Crucial scanner and the mis read cause some concern about the board itself.