Here it is, 16 x X6500 FPGA Miners for theoretically 4.2 GH/s. With rejects, it looks more like 3.8 GH/s. 258 W measured at the wall.
This whole system is quiet. I have 4 120 mm fans cooling the whole thing. They're all running at full speed, but could probably even be slowed down a bit.
Great, I love you to start out FPGA clusters, there is only one possible criticism, it is wasteful to use a USB cable when two cables are only useful around the connector, I mean the input and output data, it may reduce the cost with the use of two simple normal pins and wires between the PCB and the hub.