The MORTAR is MSI's mATX motherboard featuring the B350 chipset. Despite the price difference, MSI still see fit to incorporate their various technologies including the Steel Armour of the primary PCIe slot, Audio Boost (which is the title for a selection of technologies including: physically isolated audio circuitry, acting like a dedicated sound card for your system, dedicated PCB for left/right channels, de-pop protection, the use of audio grade capacitors, and more), DDR4 Boost (providing your memory with clean/stable power).