XMP Profiles are a feature of many newer motherboards using an Intel chipset (X58, P55, etc.) which allows for simple overclocking of your memory. Overclocked memory modules often must be manually configured in your BIOS in order to achieve the overclocked settings. A memory module which supports XMP (eXtreme Memory Profile) allows you to simply enable XMP mode in the BIOS which would then automatically configure your memory settings for the correct voltage, speed and latency values.