How Did KNC Miner Overclock their FPGAs?

[frankenmint]

I have a few spares lying around and I've now seen another company do the same with what appears to be stock off the shelf hardware.  How do I go about overclocking my own hardware (yes I'll take extra precautions for cooling and added heatsinks)  I have spartan X6500s that I'd be willing to sacarafice for extra hashpower if I were to in fact brick them in the exercise on overclocking.

[Humax]

Maybe you should try a pencil!

Works with Punin's bitfury boards and long time ago, with AMD cpu's 

[Zeek_W]

^ The thing is, this guy is actually NOT trolling. The pencil trick is real.