What FGPAs does the blade have? How much did that setup cost?
How critical is ram speed for litecoin mining? Typically I've noticed that maxing out the ram speed/volume makes more difference than GPU speed.
So to FPGA mining you'd need a lot of high speed ram, and DDR5 that is used in video cards is not available in DIMMs.
So it strikes me that you'd need a custom board developed with say a spartan 6 and plenty of DDR5. So the price isn't going to be that cheap, and the DDR5 will still use plenty of power. But then when you consider a 6990 uses 300watts, and a 7970 used 350watts, you have a fair power window to work with.
The cost and power saving would come from optimizing the amount of DDR5 you use per FPGA. However video card manufacturers have economy of scale. Would it really be cost effective??
I like the idea of having a PCI-E board developed with an FPGA to mine lite coin. You could build a system that takes 4 boards, and it would be awesome if each board had 2 FPGAs. Nice dream huh.