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Bitcoin / Hardware / Re: [ANN] Spondoolies-Tech - Best W/GH/s ratio - Shipping from stock
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on: May 23, 2014, 01:19:30 AM
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When ambient is at an acceptable temperature, you just need ventilation. It doesn't matter how much heat you put into the air if you can simply substitute that air with ambient temp air.
You think if even is +40C? Yep. It doesn't matter how fast you wee into a cup, if I keep replacing your cup with an empty cup, you'll never fill it. not quite a correct analogy. Ventilation does not prevent turbulence. Air can be travel inefficiently that hot air got suck back into the miner . You need to build a ducting system right at the rack. Thats the only way to control direction of air. Remember folks, you need ventilation and air direction control to be effective. You don't if you have floor to ceiling double ended ventilation. Ie a door on one side and a door on the other.... I have my miners in my garage and this will be the first hot weekend of the summer. I'm hoping that by opening my garage door a few times a day I can recycle the air. Its north facing and thats where the cool wind comes from. If that doesnt work I have a 12000 BTC portable AC unit ready to go. Would rather not use it though. That portable AC unit won't do anything in your garage. Once your garage's ambient temperature starts to increase well into the 80's and lower 90's there isn't much you can do. And since most garage's aren't insulated (why would they be) they are hard to cool and hard to keep warm. They aren't designed to be. Notice no videos with these powered on? There's really no where you can put one in any house and not hear it. Its an attached double garage that is insulated since im in canada. I think it will work I'll place it right near the miners I take and ezhaust through the wall to the outside. Right now im running 21 S1's and I cant hear them inside. 1 SP10 cant make that much difference. Im already using loud server psu for some of my ants. damn for a sec i thought you said 21 SP10s!!! I wanted to know what kind of garage.... hehehe until i realised .... What is your total power consumption right now? 8400 watts spread between 2 30amp 240v circuits each with their own 30 amp pdu. I would like to get more SP10's going but will need to sell some ant first. Need to keep power consumption under 11600 kw. This is already crazy and I have to draw the line somewhere! |
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Bitcoin / Hardware / Re: [ANN] Spondoolies-Tech - Best W/GH/s ratio - Shipping from stock
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on: May 23, 2014, 12:46:35 AM
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When ambient is at an acceptable temperature, you just need ventilation. It doesn't matter how much heat you put into the air if you can simply substitute that air with ambient temp air.
You think if even is +40C? Yep. It doesn't matter how fast you wee into a cup, if I keep replacing your cup with an empty cup, you'll never fill it. not quite a correct analogy. Ventilation does not prevent turbulence. Air can be travel inefficiently that hot air got suck back into the miner . You need to build a ducting system right at the rack. Thats the only way to control direction of air. Remember folks, you need ventilation and air direction control to be effective. You don't if you have floor to ceiling double ended ventilation. Ie a door on one side and a door on the other.... I have my miners in my garage and this will be the first hot weekend of the summer. I'm hoping that by opening my garage door a few times a day I can recycle the air. Its north facing and thats where the cool wind comes from. If that doesnt work I have a 12000 BTC portable AC unit ready to go. Would rather not use it though. That portable AC unit won't do anything in your garage. Once your garage's ambient temperature starts to increase well into the 80's and lower 90's there isn't much you can do. And since most garage's aren't insulated (why would they be) they are hard to cool and hard to keep warm. They aren't designed to be. Notice no videos with these powered on? There's really no where you can put one in any house and not hear it. Its an attached double garage that is insulated since im in canada. I think it will work I'll place it right near the miners I take and ezhaust through the wall to the outside. Right now im running 21 S1's and I cant hear them inside. 1 SP10 cant make that much difference. Im already using loud server psu for some of my ants. |
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Bitcoin / Hardware / Re: [ANN] Spondoolies-Tech - Best W/GH/s ratio - Shipping from stock
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on: May 23, 2014, 12:20:25 AM
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No, that is super super max. Click on each of the presets then advanced and take a look at what each of those modes tries to set for an idea of what is going on.
that's "super super max." is what I am trying to point out. SP's document states "Default = 790mv" which I believe is incorrect. It should read Default = 683mv. Please correct me if I am wrong  Cheers, QG This is the maximal voltage that the miner is *allowed* to reach in its dynamic scaling. Setting to 790mv is practically unlimited, it will stop somewhere between 670 and 710. depending on the temperature and the corner of the ASICs. If you want to make the miner more efficient (but less productive) you can set it to 660, 640 or even 600. I would not go under 580mv - some ASICs start to fail unless if you got a fast corner (but we were not lucky with our ASIC corners lately - only first batch can handle 550mv). So far best configuration for first batch (April) is start-voltage:660, max-voltage:790, for second batch (early May) start-voltage:680, max-voltage:790. I am working on making the scaling efficient on our latest batch (late May), hope to have results after the weekend. What causes the variation between batches? Normal ASIC production variations. First batch was typical corner (middle of the bell shape curve) Second and third batches were slow corner All the miners will be within the 1.4 THs +- 10% published spec, hopefully on the plus side Does that mean that the May batch is from the same wafer as the April batch just a less optimal spot closer to the edges rather than in the middle? |
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Bitcoin / Hardware / Re: [ANN] Spondoolies-Tech - Best W/GH/s ratio - Shipping from stock
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on: May 22, 2014, 07:40:33 PM
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When ambient is at an acceptable temperature, you just need ventilation. It doesn't matter how much heat you put into the air if you can simply substitute that air with ambient temp air.
You think if even is +40C? Yep. It doesn't matter how fast you wee into a cup, if I keep replacing your cup with an empty cup, you'll never fill it. not quite a correct analogy. Ventilation does not prevent turbulence. Air can be travel inefficiently that hot air got suck back into the miner . You need to build a ducting system right at the rack. Thats the only way to control direction of air. Remember folks, you need ventilation and air direction control to be effective. You don't if you have floor to ceiling double ended ventilation. Ie a door on one side and a door on the other.... I have my miners in my garage and this will be the first hot weekend of the summer. I'm hoping that by opening my garage door a few times a day I can recycle the air. Its north facing and thats where the cool wind comes from. If that doesnt work I have a 12000 BTC portable AC unit ready to go. Would rather not use it though. |
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447
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Bitcoin / Hardware / Re: [GUIDE] Undervolt antminer s1 [1.19W/GH at the wall]
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on: May 22, 2014, 04:48:12 PM
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Nice results! I just did my very first under volt under clock. I have a good multi meter all resistors read 4.46 or 4.47 to start. adding graphite is not exact and I had variance from 2.81 to 3.42 2 machines so 16 resistors. one machine does not like running at freq 300 it had 20 percent error rate. so I dropped it to freq 275 these two machines with just under clock to 300 each pulled 616 watts. and hashed at 305gh once I did both under volt and under clock I am now hashing at 295gh with 410 watts at over clock of 393 I had 398gh at 818 watts.  |
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Bitcoin / Group buys / Re: 【LIGHTNINGASIC GROUPBUY】1.5TH - 2500 USD - FREE SHIPPING IN 48 HOURS
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on: May 22, 2014, 04:23:12 PM
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Seems to be only 1170$/piece on the website. How does hosting work? The electricity price in convenient but do I have to pay for a PSU and ras PI? The price at 1,5$/ GH is on par with Bitmain, maybe more expensive if you factor in the PSU and PI. The hosting is nice, although this company does not invest enough in public relations. Maybe selling miners is their secondary business. I understand that though  Why bother when you can mine. No, u dont have to pay for PI or PSU, we take care of that. What size and model of PSU do you use? |
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456
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Bitcoin / Group buys / Re: ***Spondoolies Tech SP10 - Shipping NOW - 1.4-1.45Th/s - $2,900***
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on: May 21, 2014, 10:10:02 PM
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In my opinion it is just bad luck\timing on your part. It's no surprise that miners loose value quickly, in order to be competitive you need to be able to respond to competition. I don't think Bitmain ever gave money back, just coupons to entice you to order more product. Perhaps Spoondoolies will do the same. Have you asked them?
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