Hi Tore,
No, not normal. But you said similar in the beginning (of this topic) but then I couldn't understand (or believe).
Maybe I still can't believe it.
Try this please (and nothing else) :
1. Set to 18 again.
2. Save the settings (normals Save BIOS procedure). If it implies a restart that's OK but go into the BIOS again.
3. Use the "Save" function and now enter a name like XX02. Enter saves it (also see instructions in the right hand side). Do NOT overwrite XX01 ever.
4. Restart and go into the BIOS again. Do you still see the 18 ? (but also notice the speed the processor runs at - this shows in the top. It will not be 2400 if all is rright.
5. Load back the XX02.
And now you sort of say that the 18 has disappeared and has changed to Auto again ?
Restart to make whatever it is effective. Go into the BIOS again. You should be in the state of which you claim it happens after loading back XX01.
... Which I don't believe.
So now you have done this :
6. Load back XX01. Restart to be sure what's in there for sure.
... And I say that all is fine and it shows 18.
But is it ?
You can leave the XX02 be. But if XX01 does not work for you, then XX02 does for the future.
Best regards,
Peter