Topic: Unofficial Spondoolies SP20 thread - page 58. (Read 126204 times)

PSU would be fine, although as most people its unlikely you'll be running at max clock. There are sweet spots and lower noise at other clocks.

Has anyone tried to overclock this miners

One for now as a test. We're running out of plugs  . At least electricity is free so its all profit which helps alot. Right now we have 3 S3+'s plus a gridseed black and a couple of blades(35MH/s total) which with the death of scrypt, are basically useless but we're selling them so we didn't lose anything. We have a friend in the building which says we can load up her apartment with them as long as we pay the internet which is a good deal. I live in Toronto and there are alot of apartments that are all inclusive(free heat and electricity) so eventually we'll just rent another apartment as it's way cheaper than hosting and we can live in it. We'll buy another 2 at the end of February. Since most N. American outlets are 15A(15A x 120 Volts = 1800watts), we have to plan a little what goes where. We are getting 2 power supplies in case we have to split the plugs, ie one power supply on one plug and another power supply on a different plug as right now all the miners are in the apartment and we have other crap like TV's, and computers. I may slightly underclock so that it sits around 1500-1600 GH/s just to be safe. Thank god it's winter as all these miners really pump out the heat we have the door to the balcony cracked a bit and it's still toasty. All temps are good though as the miners sit next to the balcony door.


Edit: My supplier has 2 Thermaltake SP750P's instead of the corsairs which is slightly cheaper with the same rating. Good power supplies, have one of them in my converted fileserver with an i7 and GTX660 all overclocked with zero problems after a year of heavy gaming and some GPU mining for tests. Same rating as the Corsairs, 80Plus bronzes so I think we'll be good to go and save $30 total to boot. Only bitch is it's not modular, comes with 4 PCI-E rails but we only need 2, oh well I guess thats what zipties are for. May get a price on a evga 1300G2 just for fun and less headaches. What are your settings, fan speed and Hashrate?

Yes, no problem, one of mine was running on two CX750Ms at full blast ... until I saw the light and under-clocked it.

I think you can only tell when you get those into your hands and start running them.
how many are you getting?

We're getting the SP20 tomorrow and I plan on using 2 CX750M's as well. Will it power an SP20 at the stock rate? What are the default settings of the miner? I'm assuming the full 1600-1650 GH/s. Power consumption is not a problem we live in an all inclusive apt  . I would like to try and get the most I can SAFELY out of the machine if that means underclocking it so it runs at say 1500 GH/s that's perfectly fine. What is the max safe setting of watts per channel? 240? What about voltage? What's the default?

Why is coffee so good? :/

 yeah that is a good unit. some just won't go that low.  I have one that gets to 4x .62 with .625 as max

other findings with the five are the gear likes watts at 4 of the same 150, 160, 170, 180 ,190 ,200

 better then mixed numbers   say 180 ,179 ,177, 176.

But like gpu mining there are differences miner to miner.

I will check the watts tomorrow as I don't have the miner here and see if the watts have creeped up at all.  The numbers I gave you was about three hours of run time.  Here are my settings if they help.

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(0.58-0.80)
.625
Start Volts Unit 2(0.58-0.80)
.625
Start Volts Unit 3(0.58-0.80)
.625
Start Volts Unit 4(0.58-0.80)
.625
Set your Maximum voltage to 0.790 for maximum mining or less for economy mode
Maximum Voltage (0.580-0.790)
.630
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

  nice numbers.  you are most likely as low as possible.


 597/1160 is  0.514
 597/1168 is  0.511


even the 600/1160 is 0.517

I got to about 0.521 for my best.

Im using a power supply from an Antminers S2.  I had it laying around as I had swapped it out for a better one.  I think its a Revolutionary 1000 watt.   Not sure as I dont have it in front of me. 

[H:HW:1543Gh,W:780,L:0,A:8,MMtmp:0 TMP:(22)=>=>=>(69,69)]

This is what mine's running at now... not really underclocked but in Eastern Canada, my SP20 is also serving as a space heater at the moment.. With the offset of me not paying for electric heat.. it's like a win/win.. heh

I have been doing it for 2 days now no issues. but restarts are a little bit harder due to the really low clock.

By the way I can quite go that low

 631w 1189gh  or 622w 1183gh is my best so far.

no, SP-Tech software is exceptionally well built with safety in mind and built to make sure they have a great shelf life to outlive most other miners.
the yellow ASIC stats are nothing to be worried about but out of curiosity, can you advise what PSU you are using?

Is it bad to have yellow stats.  My miner is jumping between 600-597 watts and 1160-1168 gh/s but all my frequencies are yellow.  Should I be concerned?

once i get it in the unit, i'll dabble, i think i'd go with Zvi advice, even though it may take longer i reckon i'll get better results.

Yep, keep it simple ... always the best way.

it is interesting that toomim via Roadstress said that underclocking Sp30 and SP31 via power limits is the way to go (easiest), but zvi(sha) rec adjusting individual chip voltage, which Phil was doing here. Perhaps, adjusting power is easier for SP30-31, otherwise there are too many chips to individually adjust.

ah, cool, is it with toomins?

that's what i suspected, i'm gonna wait until i have it in the free unit til i fiddle with it, it's currently in my mums garage as she gets pensioners electric rates.