Bitcoin Forum

Bitcoin => Hardware => Topic started by: NCDiesel on November 10, 2017, 03:55:51 PM



Title: Power Supply and efficiency
Post by: NCDiesel on November 10, 2017, 03:55:51 PM
In various posts, articles, etc I am led to believe(but can't find anything definitive)  that plugging your power supplies into 208/240 circuit results in a more efficient power supply and better hash rate(albeit marginal as best I can infer).   The efficiency I can believe, but I am not sold on better hash rate.

Is this true?   Should I invest in the 240V surge protector and cable(s)?  Just curious...

Setup:  I have two EVGA Super Nova G2 gold PSUs running an Avalon miner - both support 240 - and I have a 240 outlet right beside it. 


Title: Re: Power Supply and efficiency
Post by: NotFuzzyWarm on November 10, 2017, 04:01:25 PM
Hash rate does not and cannot change when using 220v vs 110v. Assuming the PSU works correctly, it still only puts out 12vdc and that is all the miner sees. Same DC voltage = same DC current = same operation of miner. Assuming the PSU works with either 110v or 220v and feeding in 220v the wall plug eff is slightly higher but not enough to matter - at best only 0.5% difference.


Title: Re: Power Supply and efficiency
Post by: NCDiesel on November 10, 2017, 04:23:52 PM
Hash rate does not and cannot change when using 220v vs 110v. Assuming the PSU works correctly, it still only puts out 12vdc and that is all the miner sees. Same DC voltage = same DC current = same operation of miner. Assuming the PSU works with either 110v or 220v and feeding in 220v the wall plug eff is slightly higher but not enough to matter - at best only 0.5% difference.

Thanks - that's what I figured.   But I am no electronics guru/electrician so I thought I would ask.


Title: Re: Power Supply and efficiency
Post by: westom on November 11, 2017, 01:05:00 PM
Is this true?   Should I invest in the 240V surge protector and cable(s)?  Just curious...
Any recommendation that also does not say why with numbers is often a myth or scam.

If using a 240 volt power source, then all cables must already be rated for that voltage.

What does a protector do?  Protector can make damage easier if located adjacent to a miner.  Protectors that are effective never do protection.  Those proven devices only connect a surge to something completely different that does protection - single point earth ground.  Protection is where hundreds of thousands of joules are harmlessly absorbed.

Best protector for all 120 and 240 volt appliances is located at a service entrance with a low impedance (ie less than 10 foot) connection to earth.  If even one miner needs that protection, then everything in a house needs that protection.  With numbers that even define protection from direct lightning strikes.  A protector is only as effective as its earth ground (which obviously is not a wall receptacle safety ground).  And typically costs about $1 per protected appliance.



Title: Re: Power Supply and efficiency
Post by: EtihadBitcoin on November 11, 2017, 02:52:50 PM
Here is a good article to look at when deciding what power supply and power outlet to use.

https://www.anandtech.com/show/2624/debunking-power-supply-myths

I found it a quite informative read and you just might too.
Hope this help you in your question you posed here.


Title: Re: Power Supply and efficiency
Post by: Dibblah on November 12, 2017, 08:12:42 PM
240 / 220 is almost always slightly more efficient, since you're drawing less current (which means less resistive losses in the wiring). Although this effect is minuscule. It's also far easier and cheaper to get PSUs that deliver the load with 240.

It is technically possible that your PSU can change your mining rate - if you're overclocking and have one of the really old S7s. Apart from that, unless the PSU gets wobbly (way less than 12v output), there's no difference to hash rates.


Title: Re: Power Supply and efficiency
Post by: Alexbit2017 on November 13, 2017, 07:18:31 AM
It's hard to understand when you do not understand, thanks, I will continue to delve into