For the IBM-ASTRON DOME μServer project, we are currently building two types of memory DIMM-like form factor compute node boards. The first is based on a 4 core 2.2 GHz SoC and the second on a 12 core / 24 thread 1.8 GHz SoC. Both employ the 64-bit Power instruction set. Our innovative hot-water based cooling infrastructure also supplies the electrical power to our compute node board. We show initial performance results and conclude with the key lessons we have learnt and an outlook on our next activities. © 2014 IEEE.