Basically, KNC fucked a lot of people over with Neptunes and Titans. Every Titan that is shipped out seems to have at least one cube with issues out of four cubes. It's a complete mess. It only works properly on certain pools, multipools are pretty much non-functional. Each Neptune/Titan cube cube should have two PCI-e connectors, but only have one. No Titan shipped will ever ROI, I paid mine $10k and I'll be lucky to make half of it back.
Only thing it has going for it is it's very low power consumption per MH/s.
these machines do present a challenge to conventional pools/stratums.
for instance I run a pool of twenty coins and it overwhelms all vardiff settings. I've been doing lots of testing and have the machine running on a port right now with a fixed difficulty of 90,000 and I'm about to test even higher.
I'll get it sorted out , however the configuration of the mining software will allow me to break the boards down into multiple miners if I chose and mine multiple coins on different pools simultaneously.
That's pretty cool if you're able to do that. In KNC's case the issue isn't with vardiff, it lies with the speed of flushing work (1000 times slower than it should). Makes the miner pretty much useless on coins with fast block times.
For all my scrypt ASICs I've found that 2048 is pretty much the minimum difficulty that works well. Generally, anything above 4096 isn't needed. 90000 is pretty hard-core, and really shouldn't be needed unless there's a big bug in the firmware. It doesn't matter in the long run of course, higher difficulty will only cause fluctuations of reported hash speed pool side, along with variance but given time it all equals out.
