We have Cluster Server R1 with 11pcs of CPU(RK3399 and also compatible with other CPU too) clustered, Cluster server R2 with 73pcs of CPU(RK3399 and also compatible with other CPU too) clustered.
Cluster Server R1: http://en.t-firefly.com/product/clusterserver
Cluster server R2 : http://en.t-firefly.com/product/cluster/r2.html?theme=pc