Legit Reviews got to see SanDisk's UltraDIMM modules. This new storage product fits right into a DDR3 memory slot, thus offering significantly higher performance than SATA-based SSDs. The benefit over PCIe SSDs is that the memory-based solution has no latency issues, PCIe devices have to contend with each other for the PCIe lanes which can create a bottleneck.
The model pictured below is a 200GB SSD.
One of the biggest reasons for this is putting the storage device as close to the CPU as possible, cutting out all the middle men thus reducing the latency and overhead. This reduces the latency to next to nothing, improving the overall user experience. With technology like this available it makes me wonder if SSD’s as we know them will fade away while the super fast technologies like the Sandisk UlltraDIMM take over.