I'm also seeing some strange fluctuations - I have one system with two 7850s getting roughly the same hashrate on the worker as a second system with only one 7850 on a worker. I feel like I'm asking something that was probably already answered, but why does the value reported on the website vary so much from what my miner says? The website says anything from 100 to 700 Khash/sec for a single 7850 when the miner on my pc says 260 Khash/sec right now.