If TR and NFS run fine but MOH plays so poorly, I would suspect a software rather than a hardware problem.
As others have posted; reinstall your video card drivers and remember to use a driver cleaner (Google it) to make sure all the previous drivers
and their cr** is removed.
Try reinstalling the game and patching it so it`s up to date. Check its configuration, audio or graphics options can have a negative effect if set incorrectly.
If you are playing online, check your connection speed and that your version of the game is compatable with the server/s you are using.
On the hardware side, when was the last time you cleaned the CPU cooler? Dust gets in, clogs the cooling fins and overheats the processor causing it to slow down, a situation which will be made more serious by your overclock and may explain your low CPU score in 3D Mark. You might also want to check the PSU, they get clogged with fur (I`ve 4 cats) and dust as well and will also overheat and lose performance as a result.