good looking forward to the review.

Yeah pretty much a given. These sp20s are made for a 15 amp 120 volt circuit

yes most

likely  you can set it for a 750 watt psu and each sp20 machine varies like the gpus used to vary.  some over volt better some under volt better.

my stable low has been 625 watts for 1 unit and 1340 watts  for 2 units most likely due to using a 120 volt circuit for the evga 1600 p2 running the second sp20 is more watt costly.  I did get 1277 for the two but could not repeat that.

 I can do 625 watts for one  over and over.
I found you have to set the watt limits to 150 and if you set it to 4 x 150 it under volts better.


okay  I just hooked up 1 sp20 to a seasonic 850 watt plat psu.   going to test for a day. all of these are under 1 hour of testing.


then I will test a seasonic plat 760 watt psu.

right now the kwatt meter reads 803 watts. make it 797. I clocked to be under the 850




I am doing about 1360 gh



settings for the 1 sp20 on the seasonic 850 watt



asic temps look decent

I run 1 sp20 and 1 s-3 with each of my  2  evga 1300's

first setup gets 1325 for the sp20 and 490 for the s-3     1815gh at about 1215 watts.

second setup gets 1333 for the sp20 and 485 for the s-3 1818gh at about 1234 watts.

the key to the sp20 is this if you have some evga 1300 and some s-3   you can do 1+1 and get 1815 gh at 1215 watts.


if you want to run the sp20 only on the evga 1300 and push it you will get 1600gh to 1680gh  and use the same 1200 watts.  going to 1700 and staying at that is very hard to do.

So I guess you need to look at what you have on hand.

I had evga 1300's I had s-3's   so the upgrade path was easy ..  I run 5 s-3s and 5 sp20's  

I sold off some of my s-3's to make the room for the sp20's

  This is nice of you.  But the offer was for legends and not heroes. This is their thread .  I do not mind contributing info to it,  But please no one else post for me to get a free

 one.

Wednesday  diff has gone plus

https://bitcoinwisdom.com/bitcoin/difficulty  (+0.65%)  with 6 days  to go


Still hoping for under 1% but I think not.

I have a 10 page thread  https://bitcointalk.org/index.php?topic=872014.0


I can clock as low as  1200gh about 650 watts at the kwatt metere  and as high as 1710 gh 1280 watts at the kwatt meter

damn you are on the attack!!

boy 40  I remember 40 just like it was yesterday. It was not I was born in 1957.


 Happy birthday

wow someone in my corner.  thanks,

I finished my how low can you go testing this morning.

 Seems that an underclock to 1200-1225 is stable  this means 2 will work on the evga 1600 p2 or evga 1600 g2  with under 1350 watts.  

which means a USA 15 amp circuit can run two of them under the safety number of watts 1440 is the derated number.

Sooo on the low end 650-675 watts at 1225 is pretty easy .

Hint 2 cheaper psus on one circuit  allow for  more then 2400gh

going for it again today


I am the one in blue .
I will do this for 8 hours or so.



then I will move these from cex.io to hold the place so to speak.

so asic miner is promising a .3 watt miner at the wall socket.

if you could build one that works and does not burn up caps .  I will buy it.  but after my tube and then my prisma troubles I will wait for others to buy them first.

would be nice to have a .3 watt miner. an evga 1300 g2 could power a 3000gh unit easy.


Right now I can run 2444gh on an evga 1600g2  ..  I can do this by under volt of the sp20.  2 units will go to about 625 watts plus 625 watts = 1350 watts at the kwatt meter plug

So this is about the best a home miner can do today on 1x 120 volt  15 amp circuit.  need a 1500 watt psu to do it.


If you can do .3 watts a gh it may be possible to do a 4th machine  for 1200 watts .  that would be a nice improvement.. it would allow the evga 1300 to be used as that psu can do 1200 watts non-stop.

lets see if you do it.

that method described works. but you have to remember that the psu.  seasonic  1000 watt.   can only do 225 for each pcie. well maybe 250.

setting 288 for the unit's pcie may hurt the psu if you type in a higher voltage by accident.

that method is simple and if your psu has tons of power you won't hurt the psu.

if you have a weaker psu you can have issues.


also when you use .64 as the starting volts the machine may not fire up.
 these machines remind me of gpus  the best settings vary from machine to machine.

after staying up for hours.  I have stopped my underclock testing .  I can go no lower then 1350 watts and be stable on the restarts.

so 2 sp's will run easy on the evga 1600p2

they will not run safely on the evga 1300 g2

but if you have a decent server psu you can do 2 of these. any good  1600 watt psu can do 2 at about 1350 watts at the kwatt meter and 2450 gh.

if you clock lower it gets very hard to do restarts. good news is 2 on a 15 amp 120 circuit .  also a good 750 watt psu can run one.  I have a seasonic 760 watt plat

and I have a seasonic 850 watt plat.  I will test them over the next few days.

yeah but that low is tricky  ..


730 watts and 1300gh is easy  so your gold 1000 watt seasonic can do it .  let me know when you get it I will do test settings for you to try.


the setting in bold should keep you safe with the seasonic 1000 watt psu

Set your fans to 80 unless you are in very cold place or in economy mode
Fan Speed -------------------------------------------------------------------------------------------------------50

Set your starting voltage no more then 10 mv under your stable working voltage (from ASIC stats page)
Start Volts Unit 1(0.64-0.80)    -------------------------------------------------------------------------------------------------0.659

Start Volts Unit 2(0.64-0.80) ---------------------------------------------------------------------------------------------------0.659

Start Volts Unit 3(0.58-0.80) ---------------------------------------------------------------------------------------------------0.657

Start Volts Unit 4(0.58-0.80) ---------------------------------------------------------------------------------------------------0.657

Set your Maximum voltage to 0.790 for maximum mining or less for economy mode
Maximum Voltage (0.580-0.790) ---------------------------------------------------------------------------------------------- 0.661

Set PSU power to 120 and let the system learn the actual PSU limit.
Max PSU Power Unit 1 (70W - 288W) -----------------------------------------------------------------------------------------180

Max PSU Power Unit 2 (70W - 288W)-----------------------------------------------------------------------------------------180

Max PSU Power Unit 3 (70W - 288W)----------------------------------------------------------------------------------------180

Max PSU Power Unit 4 (70W - 288W)-----------------------------------------------------------------------------------------180

yes if you go too high for temps you get yellow

if you go too low for freq you get yellow.

now i really hope this is not a problem as two sp20's are on the one evga 1600 p2  at 1266 watts.  It is an easy fix to go up to 1350 watts as the evga 1600 p2 and my 15 amp usa power circuit can do 1440 watts 24/7/365

but if it is a problem my hope to run 2 on an evga 1300 g2 will be done.  I am going to proceed slowly with the next test.

yeah it is a piece of cake on the more costly 1600 p2

I am going to run the 1600 p2 at the 1266 watt 2400gh and low asic freq overnight.

 if I am good to go I will test the 1600 p2 at a lower setting  from 7am to 7pm tomorrow.

if it still works I will then do the 1300 g2 with 2 sp20's

yeah I am a bit annoyed being short of a legend .  but make lemonade from lemons


 so a shout out to the legends testing please try the killer delta  fan and over clock the unit.


 I would love to see the user's show the over clock potential.  maybe a better fan for the under clock guy like my self.  for that matter maybe someone would use the super powerful monster delta fan for over clock .  it moves 25 percent more air then the stock fan.  mr teal is really handy with gear.

this is the fastest fan around.  would be the best for over clocking maybe??

http://www.newegg.com/Product/Product.aspx?Item=N82E16835213001&cm_re=delta_fan_120mm-_-35-213-001-_-Product

It is but I did not want to  do multiple posts .

 I am kind of excited as I think I may be able to run 2 of these on an evga 1300 g2 safely .  this really makes these a great upgrade.

For now two are stable at 1266 watts and about 2400gh

I will run this over night due to the warning on the asics  low freq .

I am a bit afraid to go lower until the sp tech says it is okay

well I DON'T have the ability to test at 230 volts with a 1600 watt psu  titanium or not.

but I have:

 3 evga 1300 g2's

1 evga 1600 p2

1 seasonic 1200 watt plat rated psu

so under-clocking just a little lower then 1266 watts for 2 sp20's would allow me to  run all those evga's with 2sp20 each.


so I know the sp30/31 can do lower freq then  750 can these sp20's go as low ?  Is this under clock safe?

Yes I have gone a bit lower I am now doing 1266 watts and 2400gh on the evga 1600 p2

I have an issue these super low settings have made warning lights on my asic's.  It means I may have reached the lowest they can go.  I am waiting for the tech on the main thread to answer my question on this issue.

I need some advice in this area with the low clocks I get low freq here are the 2 units asic stats

fan on 40 and all of the asic chips are at really low freq.  now my watts are low my volts are low.  so these low asic numbers should be there.

My question is will the low numbers be hard on the chips?  my evga 1600 p2 has the over head  to boost all the settings.

 but I am trying to go lower.  right now I am at 1266 watts and 2400 gh. is it safe to drop just a bit lower? or do I need to boost chips up just a bit.