K some VERY VERY preliminary verifiable measurements. (verifiable from my side).
Iv'e had code for some time that takes about 1ms to do ONE round (no laughing at the back there), which would make it about a 1kh/s.
This is actual code on an FPGA, yes it has not been optimized yet and yes it is a SINGLE core.
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This is not a 'get rich quick scheme' but rather a pure research task, possibly the first images of an FPGA product running litecoin.
Crypto currencies are of interest to me, but I really will be surprised if people can break into high double figures with a single core on an FPGA.
Interesting stuff. Thinking about having a play around with this myself. Is there any opensource Scrypt VHDL out there? Or should I just roll my own with the SHA1 and mod the Salsa20 that is up on opencores site? I'm not thinking about mining or anything just to get some throughput data/energy costs etc and also work out what the problems are people will face who want todo it properly.
If all else fails I'm thinking of running it on top of a NIOS II implementation. Completely pointless but got to be worth a shot just for the laughs.