The Viking Modular SATADIMM
From this side the Viking SATADIMM looks like it could be an ECC DDR3 memory module. Upon closer inspection, the SandForce SF-1500 controller gives the secret away. Viking Modular used Micron NAND flash on the SATADIMM.
On the other side we found a daughter board that holds the Super Cap and power circuitry. The standard SATA connector is on the DIMM PCB side.
Here we see it all together with the Super Cap exposed. The amount of engineering that went into the Viking SATADIMM is remarkable.
Most people would think that a DIMM socket is pretty straight forward, but that isn't the case. Modern motherboards have their sockets installed in pairs; two sockets are close together, then a small space, then another pair. This posed a challenge when designing the SATADIMM and the SATA plug needed to be placed strategically to avoid contact with other DIMMs.
Even with the daughter board, the SATADIMM has an extremely thin profile that will allow you to make servers with higher storage density.