I posted on the zcash forum, but for others here...

Awesome job! I need to eat my shorts now that you actually released a reasonably fast open sourced miner. From the Toonim thread "The GPU miner completes one Equihash run in 45 ms (approx. 41.7 Sol/s) on an R9 290." Though, I'm not convinced price per watt is going to be better than some of the CPU miners out there if they are really claiming 6+ Sol/s per thread! I haven't been able to test or verify those yet.

Getting approximate 37.25 Sols/s on each of my Sapphire r290 cards. Haven't messed with OC yet. Edit: environment, standard fglrx drivers on Ubuntu 64bit 14.04 LTS.

Temps stable around 73C, so they aren't being worked too hard yet. I can't find my Kill-a-watt meter, but this 4x GPU rig was configured to max out at 14.9AMPs while mining Scrypt-N optimized. I'm going to guess it's much less than that.