Enable XMP and than download run Prime95 version 26.6 you want this one so that it doesn't hammer your CPU into oblivion select the test blend when it asks you what test you want to run. To test the memory to make sure it is stable I would let it run for at least 8 hours. This may not be all that necessary but I am a major advocate of being overly sure an overclock is stable. A lot of people forget that XMP is an overclock and anything beyond the CPU's supported memory speed is an overclock. With all that being said you should have a nice stable RAM overclock that may improve performace by a bit