I was planning on using two separate outlets on different breakers thats not a problem running the numbers honestly running an SP30 at 4.1 TH at 2600WATT actually
running the numbers provides a better hash/Watt number than 4.5 TH at 2900WATT, not sure what all the big deal with maxizing the hash ratio to all ends is. Hash/Watt
is what matters in the end.
If you already have 2 circuits installed, then just buy the cables with the correct ends, and you should be good to go. Honestly though, even at 3kW, you're not to go over 12-13A @240v, which is perfectly safe on a 20A circuit.
Find the plug that matches your recepticles:
http://smile.amazon.com/SF-Cable-NEMA-L6-20P-250V/dp/B009ZERV72http://smile.amazon.com/6-20P-Power-Cord-Adapter-Foot/dp/B00H7JR636/This one already has 2xC13, so you'd be good to go.
http://smile.amazon.com/L6-30P-C13-Splitter-Power-Cable/dp/B00BGAEBNU/And of course you can easily get C13-C14 extension cables wherever (online...Don't expect to find them at Ace Hardware). Though I would be sure to get those cables rated for 250v & at least 15-20A.
As to the W/Hash ratio, that is what matters "in the end" only so much as you are talking end of life of your hardware. As RoadStress said after the difficulty is >70B. Until then, maximize your hash rate as much as you safely can.
Thanks a lot for this info and no I don't have the plugs yet I figure I can grab a 30AMP plug from home depot or something. I Initially planned on getting two new 30AMP
circuits installed for $700 but with with the lesser hash rate than I expected on the SP30 (4.5TH vs close to 6TH) I decided to pass on those until I am able to purchase a
second sp30 or some S3s. For now I was planning on stealing from 30A 240V my dryer during uses the week and then on Saturday when the dyer is in use I have a
couple of 20AMP 120V outlets on separate breakers to power the SP30 until Sunday when the 30AMP 240V circuit is available again.
Thanks as well RoadStress for the that info on the diffuclity. Btw are we projected to reach 70Bill around April of next year ?