It is best to check the motherboards specification and use memory that has been tested & approved for the mother board. Not all memory is created equal!
In general, If you use a faster memory than the processor supports, the memory will just be clocked down to the processor speed so you paid for preformance you can't use, but "normally" the memory wil have no problems.
The exception is when the memory does have an issue, either because of the type or quality of memory, timing requirements, voltage requirements or other reason like BIOS not being able to identify the memory. When this occurs, a blue screen would be a very likly out come (depending on what the blue screen error is)
