And unfortunately it is not possible to clock the miner over 390Mhz. no idea why.
Take a look:
https://bitcointalk.org/index.php?topic=2790982.msg33090927#msg33090927It's a bug in sgminer. It should be something like
((clk - 200) / 10) + 2
instead. However it doesn't really matter (for the reasons mentioned in my last post) so I didn't bother correcting it in the version I posted.