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# Max MHs on 20A breaker.

Member Posts: 22
Budy of mine is always trying to get more rigs in his appartment. Problem is he has limited power availability. For conversation sake and the fun of a discussion, what rig setup (maybe one rig maybe two; could combine different cards, psus, etc) would you use to get maximum Mhs if all you had was one 120V 20A (ie 16A due to 80% rule in electrical code) circuit to use. It will be funny if he reads this thread as he is often browsing these forums.

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This limit (120V 20A) look like a bad joke.
I don't believe that it's true.
Appartments must also have 240 V rail for power-hungry devices.
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384MH/s
• Member Posts: 86
1070 rigs. But those are expensive as fk, not worth it imo
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384MH/s

And candles or torch to light up an apartment.
Campfire to cook.

• Member Posts: 22
Jukebox said:

This limit (120V 20A) look like a bad joke.
I don't believe that it's true.
Appartments must also have 240 V rail for power-hungry devices.

Oh yes they do forsure. But I set parameters at 120V 20A to avoid getting onto the topic of efficiency at 240V.
• Member Posts: 331 ✭✭✭
I recommend R9 380 at core 820 , mem 1500. They will use 140W per each, you can run two rigs of 5 r9 380, and one rig of 4 r9 380. The total mh will be 21*14 = 294mh
• Member Posts: 15
Jukebox said:

384MH/s

And candles or torch to light up an apartment.
Campfire to cook.

Why you think so?
Simple math shows this:
120V * 16A = 1920W

One rig of 6* rx470/4gb with gold PSU would need ~ 900W. So two rigs would fit and they would make 2* 165MH = 330MH

So I think with more precise calcs and using full 1920W you could get what @adaseb wrote...
• Member Posts: 640 ✭✭✭
Alexx said:

Why you think so?
Simple math shows this:
120V * 16A = 1920W

Because a lot of other devices in apartments also need to be powered on sometimes, and they can consume 1-2 kW each.