ASUS' P8Z77-I Deluxe is a special motherboard. Even though it's a Mini-ITX model, it has a 10-phase power design, which is really appreciated by overclockers. To make this possible on such a small motherboard, ASUS has opted for a solution involving a separate PCB that's positioned angled on top of the motherboard, right above the CPU-socket.
Although water blocks are available for the motherboard, they only cool the actual processor. Most overclockers will prefer a solution where other components, such as the chipset and VRM, are also cooled. Because of the P8Z77-I Deluxe's separate PCB, it was quite tricky to develop a compatible cooler. The Taiwanese Bitspower has done just that, with its new AIZ77ITXD.