14 DAY TRIAL // Motherboard water blocks may not be exactly unheard of, but they are quite rare compared to those for GPUs and CPUs. EK is making one for the ASUS Republic of Gamers Rampage IV Black Edition X79 LGA-2011.
The water block will be called EK-FB KIT ASUS R4BE and won't, in fact, be one water block but two.
One of them will cover the power regulation (VRM / MOSFETs) module, while the other will settle over the Intel X79 Express southbridge (PCH) chip.
Presumably, your CPU and GPU cards will also get water cooling, or at least the former, providing some serious overclocking potential.
There will be Original and Clean CSQ designs to choose from, but shipments will only start in December 2013, and photos probably won't be available before then either.