Updated pic: 5 s7, 2 s5. all plugged into 5 20amp sockets.

There is a 24inch drum fan against the back wall blowing right at the miners. The 6inch duct brings in cold air from the AC. The orange blower is attached to a 4in dryer hose that pumps some of the heat outside and some into the finished side of the basement where the air return is.

it aint pretty but it works.

Is it possible to earn 1000 or atleast 100 bitcoins with trading Altcoins.If I buy some bitcoin at cheaper rate today and it's price goes up in future?Which alt you think has potential to make me 1000 btc

The fluctuation is caused by the way hashrate is calculated. Observe the image below.



The bar with squares represents your GPU miner thread. Each square is a GPU kernel run. Within each run it calculates --cl-global-work * --cl-local-work hashes (i.e 64 * 65536 = 4194304). The yellow bar represents the the getWork thread, which fetches new mining jobs from geth or pool and also displays hashrate. Most of the time it is a sleeping thread, with a period of --farm-recheck (default 500ms). So once in 500ms, it checks the amount of hashes the miner thread has done. But the miner thread only updates its total after having completed its batch. So the red squares aren't counted. In the sketch I quickly drafted there's only one interval with 3 runs and the rest with 4, but I hope you get the idea.

You can get a more stable hashrate figure by increasing the value of --farm-recheck (i.e. 3000), but don't do this if you're using getwork (-F flag), because then you'll also only get new jobs every 3 seconds. With the stratum miner it doesn't matter, it gets work pushed towards the miners in a separate thread. Another option is lowering --cl-global-work, but that leads to more CPU overhead, which is also not what you want.