but i dont think my mobo supports 1333mhz...it only shows 1200(oc)/1066/800mhz
MSI only guarantees
that DDR3 @1200 modules will work with its mobo. Anyway, it doesn't mean
that a memory with a higher frequency won't work. Your memory modules are a very good example.
As I said you before, if the cpu-z says you that the frequency is 667Mhz, there is not any doubt. Your memory modules are running at 1333Mhz.