Phil - Thanks for this thread! My SP20 arrives on Monday and I am trying to decide how I should power it. My goal is the most GH I can squeeze out of a single PSU (I am almost out of space is my issue). My options for the single PSU are: Corsair 1200AXi, LEPA 1600, and Silverstone 1500. These are all PSU I have left over from my GPU farming days. I am assuming since the Silverstone only has 25 AMP rails it is out. The LEPA has 4 x 30 AMP rails, and the Corsair is a single rail. I am leaning towards the Corsair, but will it provide more than the LEPA? If anyone has some thoughts on this let me know!
Edit: I do not care about power consumption - just GH!
use the corsair. run thesp in the 1400gh range (yeah I know not 1700) and add a s-3 to the corsair run that at freq 237-243 you get 1400gh + 475 gh = 1875gh I have the 5 of them and to run it to the max is like taking my little Kia Forte and driving down to Atlanic City to play some craps. It is a 60 mile ride Almost all highway. Now my Kia Can go 120mph on the speedometer. When I go down to AC I just drive at 75mph it is an easy drive. I don't try to run the car at 120 or even 110 mph. Even if I have free gas. These machines run really well at the 1350-1410gh mark. The amount of extra power to go higher could be spent on an s-3 on the same psu. It is easy to get just about 1800gh with 1 sp20 and 1 s-3 on your corsair. It will be hard to get 1700 alone with the sp20 and your corsair. I figure you can do 100 to 200gh more blending the 2 on the corsair rather then maxing the 1 sp20 ( both setups will use same power in watts around 1200-1300) Isn't the Corsair multi-rail but you can select some virtual “single rail” or “multi-rail” software modes? I remember people had trouble with them on KnC gear. I'd stick with the LEPA I run evga's and seasonics. years ago I had a fire (not mining) with a corsair was very lucky to have no one hurt. So I feel a bit superstitious about using a corsair. The lepa has a lot of rails and can be a bit confusing to use. But if you hook it up correctly it is a good psu. I told him the corsair because I thought it was single rail. |
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Interesting there are 3.1 days left to go
At present the calculation is negative we might be in for a second difficulty decrease (honestly was expecting a small marginal increase instead of it dropping a bit more downward)
Estimated Next Difficulty: 39,952,664,727 (-0.14%)
Saying farewell to 40 million.
I have been looking for this to happen. Just don't know if we are good for 1 or 2 or more jumps like this. If .3 watt gear can be built for good prices and if it goes to market in feb or march . we can all stand pat for a while. If will be interesting if .3 watt gear comes out in bulk at a good price. there is no question all the gear over 1 watt is leaving the network and getting replaced by .8 or .6 watt gear. This combined with the 350 usd price has really slowed growth. If good .3 watt gear arrives it may force out all the s-'3s this is possible at the correct btc per usd price. and the network will not grow that much. I replaced almost all of my s-3s with sp20's just easier to do. I kept my kwatts the same and boosted my gh a little. some may lower the kwatts a keep the gh the same. +1. My 1-1.2w/gh asicminer equipment will probably be unplugged the moment diff grows another 5%. Just put a trio of sp31 units online for just over 14th/8kW - as long as jumps stay <5% for a few more months or price gets up past $600 again Can't quite do that much my power max in the winter is 6kw. in the summer 3 kwatt without A/C right now BTC = 342 at https://bitcoinwisdom.com/bitcoin/difficulty and diff is : (-0.46%)with only 2.5 days to go for adjustment lower then +2% looks like it will happen |
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Phil - Thanks for this thread! My SP20 arrives on Monday and I am trying to decide how I should power it. My goal is the most GH I can squeeze out of a single PSU (I am almost out of space is my issue). My options for the single PSU are: Corsair 1200AXi, LEPA 1600, and Silverstone 1500. These are all PSU I have left over from my GPU farming days. I am assuming since the Silverstone only has 25 AMP rails it is out. The LEPA has 4 x 30 AMP rails, and the Corsair is a single rail. I am leaning towards the Corsair, but will it provide more than the LEPA? If anyone has some thoughts on this let me know!
Edit: I do not care about power consumption - just GH!
use the corsair. run thesp in the 1400gh range (yeah I know not 1700) and add a s-3 to the corsair run that at freq 237-243 you get 1400gh + 475 gh = 1875gh I have the 5 of them and to run it to the max is like taking my little Kia Forte and driving down to Atlanic City to play some craps. It is a 60 mile ride Almost all highway. Now my Kia Can go 120mph on the speedometer. When I go down to AC I just drive at 75mph it is an easy drive. I don't try to run the car at 120 or even 110 mph. Even if I have free gas. These machines run really well at the 1350-1410gh mark. The amount of extra power to go higher could be spent on an s-3 on the same psu. It is easy to get just about 1800gh with 1 sp20 and 1 s-3 on your corsair. It will be hard to get 1700 alone with the sp20 and your corsair. I figure you can do 100 to 200gh more blending the 2 on the corsair rather then maxing the 1 sp20 ( both setups will use same power in watts around 1200-1300) |
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Interesting there are 3.1 days left to go
At present the calculation is negative we might be in for a second difficulty decrease (honestly was expecting a small marginal increase instead of it dropping a bit more downward)
Estimated Next Difficulty: 39,952,664,727 (-0.14%)
Saying farewell to 40 million.
I have been looking for this to happen. Just don't know if we are good for 1 or 2 or more jumps like this. If .3 watt gear can be built for good prices and if it goes to market in feb or march . we can all stand pat for a while. If will be interesting if .3 watt gear comes out in bulk at a good price. there is no question all the gear over 1 watt is leaving the network and getting replaced by .8 or .6 watt gear. This combined with the 350 usd price has really slowed growth. If good .3 watt gear arrives it may force out all the s-'3s this is possible at the correct btc per usd price. and the network will not grow that much. I replaced almost all of my s-3s with sp20's just easier to do. I kept my kwatts the same and boosted my gh a little. some may lower the kwatts a keep the gh the same. |
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At 3 days to go, it's going to be close to 0 again.
If so it will mean that nov 5 diff was 39,603,666,252 Dec 16 to dec 29 diff would be 40,007,470,271 So for 54-56 days you have a flat diff. with btc at 350usd it could do this as long as it wants. I truly would love to see it last at under 42-44 up to my birthday in late JAN 2015. I knew it would get flater and I have been posting that it would do this Since Sept 2014. I am very hopeful for a long time like this. |
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here is a guess you have all the miners set to .69 volts and your max is .79 volts. not correct they should be closer. like .69 .69 .69 .69 and .7 max somewhere some place a spondooolies tech said .005 is the most between your startups and your max. I have found .010 is still okay. you are .100 apart!! |
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I wonder if someone tried mix and match PSU, like CX750 and CX500 to power one SP20 at the lower total wattage, like 800W?
Unfortunately, i don't have CX850, only 750 and 500 plus evga 1300. If i can mix and match, i might order more, otherwise I will have to run one Sp20 on two CX750, which would be suboptimal, of course.
my problem is I don't have many small psu's. I think I have a seasonic 650 gold and a seasonic 450 gold fanless. Maybe I try testing that on sunday. I will need to use a fan on the fanless but I have sooo many fans I can do that. |
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Has anyone tried to over-clock this miners  Yes, me. I think these device are totally made with no "space" for OC. Heat sinks are just enough to not burn the asic chip and they are as small as possible. They live just because of good thermal politics of asic chip. There is one way to OC, 100% fan, extremely cold ambient air and enough power. My result in ambient temperature around 10/15 deg celsium is fluctoating around 1.65 and 1.7 TH. actual power is around 950/1000 watt nett power. Dont forget that if you OC device then the efficiency is very low and you probably will lose profit due to higher electricity bill. yeah oc is only feasible if your power is really cheap and you have lots of it. 750 watts does an easy 1350 gh 1200 watts does a hard 1650-1700 gh you are getting the better watts because of great ambient temps. but I would guess you will burn the gear up or the psu's without very careful monitoring. |
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Yeah, unfortunately I don't have a PSU on hand. Well I do have a couple, but nothing that could accommodate the SP20, especially with an OC. Man, I need to be an early adopter in something... Only way to really make anything with mining, it would seem. I just need to get to the point where I can invest my BTC into the next big ASIC. Then I'll be in good shape.  @op the sp20 is far better at 750 watts and 1350gh then overclocking it. it needs a decent 850 watt psu. @ nolist I jumped on the s-3's way back in july the first batch.. I paid 1.35 btc they earned 2.1 btc so far. I jumped on the sp20's for Black friday. I sold off all the s-3's to convert to the sp20's With the low diff jumps they should do very well for me. |
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Woo me and Roadstress are famous! 7:52  Nice video, just a shame that you had to be on the same one as the MAT scammers.  Are the SP35's from stock now or still built to order? Within about 2 days we'll achieve stock. It's the 13th and just curious if you've achieved "stock", as I haven't received confirmation on the shipment of my SP35 order ... It is Sat. and they are closed try in about 12-16 hours. |
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Ther SP20 says it gets about 1.7TH with a power consumption of 1200 watts... So about the same power consumption, with 200gh more power and $200 more in price... Right now, anyway...
However, if you do the math, the faster delivery should actually make up for that $200 within the month, and will be a tad more future proof... Maybe this is decent.
Touch decision, IMO. But S3's are typically going for like $200 each. Some are that plus shipping. You'd pay more for less hashing power, but in-hand... Then again, I only have a PSU to power one... Damn, if this A1 was in-hand, I'd pay for it in a heartbeat, you know?
Shoot...
the sp20 gets 1350gh with 750 watts the 1200 watt 1700 gh is with a monster overclock . you spend 450 watts to get that last 350gh. I have a very long detailed thread on the sp20. if you have a 1000 watt psu in hand the sp20 is a good deal https://bitcointalk.org/index.php?topic=872014.0if you have to buy a psu it is not a great deal. |
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okay they are not .66 watt miners. most 1.5th dragons use 1100 watts. and you wait 30 days to get it. Heck I just sold 5 s-3's for about 170 each.. so 3 were 510……. I have none left. https://bitcointalk.org/index.php?topic=889688.0 I would tell you I rather have three s-3+'s then 1 1.5th dragon miner. I switched out my s-3's for sp20's. I now have 6 sp20's well 5 with 1 on the way. |
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Hi gang,
I'm not sure if I am having connection issues or miner issues. I can not figure out why my SP20 is going offline. It will run for a few hous or day then just drop off. It is still running so I can not tell it has dropped unless I check my user stats page on eligius. It sounds the same.
When I notice this has happened, I can log into my miner until I switch the power supplies off then back on. Then I can log in but it also starts mining again. Is this happening to anyone else? I have emailed tech support Monday but I have not heard back.
I am using 2 fortress Platinum PSU. 1-650w and 1-750w
I had a fortress 750 it has 2 pcie cable and each has 2 plugs so 2 x 2 = four plugs you can only use 2 of them. I do not have a fortress 650. I am almost certain you are trying for 1500-1700gh and have high settings I would like to know your settings here are 'safe' under clock settings these use very little power for an sp20 about 770 watts and you get 1360 gh http://imageshack.com/a/img909/1174/yAE2ax.png  |
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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?
I have a couple of 1300W EVGA PSUs too. If you can manage to run 2 SP20s on one PSU I would consider getting 2 so keep us updated. 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 My EVGA 1300 just died after 4 days with a SP20. Luckily the SP20 made it ok. Sorry to hear about the loss of a PSU. I have a EVGA 1300 running on one as well. Mine is working great no problems. I would contact EVGA hopefully they can get you a RMA quickly. I think it was just a bad unit. Ill get it sorted soon! What settings? what watts were you using? at your k-watt meter what hash rate? these are about as low as you can go and the gear is using 630 watts at kwatt meter mining at 1183gh I am using a seasonic 860 plat with this unit. all is very cool.   |
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Overall difficulty has not jumped like I would expect if a new next gen miner was out. I think once AM or SP5 that are speculated are out we will see a overall jump we haven't yet https://bitcoinwisdom.com/bitcoin/difficultyBitcoin Difficulty: 40,007,470,271 Estimated Next Difficulty: 39,873,927,899 (-0.33%) Adjust time: After 587 Blocks, About 4.1 days Hashrate(?): 292,698,355 GH/s Block Generation Time(?): 1 block: 10.1 minutes 3 blocks: 30.1 minutes 6 blocks: 1.0 hours Would be nice to get a small drop -(0.55%) sounds good. But in reality I still think +(1.0%) is more like it. |
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I am back to my philipma1957 account. I sold out. all are shipped but 1 and that ships to Pittsburg PA on sat. 13th dec.
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I checked my miner this morning after running for 24 hours and it was running at 1163 gh/s at 607. This works for me since I can squeeze more th/s out of my space.
nice I have five of them and can't quite get that low. I sold all my s-3's and will run 6 or 7 sp20's vs 12 s-3's. I do have room for 7 and i can power 7. But I think stopping as 6 is more practical. I have 5 really good psu's 3 evga 1300 g2 I can run 1.5 sp20's a psu x 3 = 4.5 sp20 1 evga 1600 p2 I can run 1.5 sp20 = 1.5 sp20 1 seasonic 1200 plat I can run 1.5 sp20 = 1.5 sp20 comes to 7.5 maybe 8 sp20's max if I clock them at 750 watts and 1350 gh so 6k watts and 10800 gh looks close to max for me is I do 6 I would be 4.5 kwatts and 8100 gh about .55 w per gh |
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Has anyone tried to overclock this miners yes and this miner does this 600 watts 1180 gh fan at 40 750 watts 1350 gh fan at 50 1200 to 1250 watts 1650-1710 gh fan at 90-100 there is not much reason to try the over clock but if you have ery cheap power and if you have a cold room do not mind a loud fan use good and I mean really good pcie wires and a psu or 2 psu's that will do proper watts say an evga 1600g2 or evga 1600p2 or 2 corsair 750 watts psu's. You can get 1650 to 1750max.. no on has shown better then those numbers. For a long time period. those numbers use crazy power.. |
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