I haven't had any problem running the sp20 in my basement at home alongside my antminers. It is significantly louder than my antminer s1's and s3's, don't know how the noise compares to the s5 yet, but will soon. My only complaint about the sp20 isn't the noise because you can just run it in the garage or the basement and probably won't be able to hear it. (I would not run the sp20 in the living room it's too loud for that, but I would consider running an antminer in the living room). My only complaint about the sp20 is that mine can't do the stated 1.7th with it, only runs at 80% fan speed comfortably at ~1.4th and 1.6th with fans at a 100%. So I've just been running my sp20 1.4th. I think it's a really excellent unit just wish the terrahash was more conservatively represented.
yeah, you can run it at ~1360-65GH with fan 30 (as long as your ambient temperature is at or below 30C=86F) and ~800W at the wall, which gives much better value.
yeah I found 1330, 1350 ,1370 miner to miner and it is good. = .55 watts
1400 or 1425 and it starts sucking power harder. = .59 watts
I can run 1 sp20 and 1 s-3 on each evga 1300g2 at 1325 and at 450 get very good power rates.
I too look forward to the s-5. I want to mod it with the 7 inch silverstone fan and see how quiet it does at 1100 gh then 1000 gh