I just bought an Asic bitcoin miner. The suggested PSU is a 600 watt, 80+ Gold. I have a Corsair tx850 (850 watt 80+ bronze, http://www.newegg.com/Product/Product.aspx?Item=N82E16817139022). Is it worth it to buy a 650 Watt 80+ Gold PSU, at $135 Canadian, or should I just use the 850 Watt one I already have? Specifically, will the 650 Watt PSU save enough energy to make it worth the $135 investment? The miner will be running continually (all day and all night). What about wear and tear on the miner, between the two PSU's? Lastly, what about heat output? Will the 850 Watt PSU output a lot more heat than the 650 Watt PSU?