Good luck getting the inspector to approve that.  |
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While I do, in fact, want to purchase hashing power in this way, I have had the same sentiment as gmaxwell. There is a distinct possibility of an entity contracting for a majority of power. (through shell companies, and all kinds of obfuscation so no one noticed the consolidation even if the mining community is vigilant.
Other than this type of peer pressure, I'm not really sure that there's anyway to prevent it - consolidation is a natural process in the free market. Maybe general gentleman's agreement to not sell any one entity too much hash power at any one time is a good start?
Pools are validated as part of the process (can't just add any old pool and start mining). |
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Yochdog, I haven't heard from you what kind of ambient temps to expect in your location - lowest winter temp, and highest summer temp. Also, whether you would be allowed to cut holes in the side of the building for large fans. Once I have that info, I could advise better on necessary cooling.
For instance, in Florida you want A/C year round, but in Ohio you would be able to scavenge outside air during the winter using a variable damper.
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Yes of course - the 30 amp circuit would need 10 AWG wire, but you don't need to run #10 to each rig. It would only go to the PDU(s). From there, you get a pigtail rated for 15 or 20 amps to feed the PSU(s) on each rig.
Well water - I suppose you could pump it up, circulate it thru a heat exchanger, and then dump it back down the well, but that seems like it would be very prone to bad things growing (bacteria, algae, etc) from the heat. Not to mention that it would re-heat the intake water, although I'm not sure to what extent.
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I feel like I am in some twilight zone. Matthew is producing the most unintelligible pollution.
I just say things people don't agree with.
So, don't say them and he will shut up. ¿Comprende? I swear by my life, and my love of it, that I will never live for the sake of another man, nor ask another man to live for mine. In that case, go troll another forum where maybe like-minded idiots will discuss things with you. SA or 4chan maybe. |
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I feel like I am in some twilight zone. Matthew is producing the most unintelligible pollution.
I just say things people don't agree with.
So, don't say them and he will shut up. ¿Comprende? |
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I know this has probably been covered in the 14 pages of this thread, but:
Why won't risers work to use the inaccessible slots?
They will. On the previous page, I discuss how I can remove the plastic shroud and blower fan on the video cards, allowing me to use my own fan setup and allowing more space between them. The additional space between them will allow me to use risers to have a 2 level design. |
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No offense, but if you're buying shares on GPUMAX and sending them to PPS pools, you're kinda missing the point.
In any case, leave if you want, more BTC for the rest of us!
Derpbit offers proportional, btw. |
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I really like FirstBits... but it's fatal flaw, especially with regard to newcomers, is the requirement that the address exists in the blockchain. If there is anyway to overcome this, PLEASE make it happen. Also, the ease of making a QR code by appending /qr is a killer feature of btc.to. If this can be replicated, this needs to happen too.
But this endeavour, at least while people are still learning *everything* about Bitcoin, the firehose of information needs to be turned down a bit so the noobs are not overwhelmed.
edit:
I'm not advising girls to NOT use first bits... but they can adopt this after they've picked up the basics. For /r/girlsgonebitcoin though, I think it's in our best interest to promote btc.to until they get firstbits on their own.
For btc.to, we can assume that that is the site in use, and all they need to post is /444 or /ae for instance. Not need for the full http://btc.to/blahblahblah stuff. |
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With a bit of custom code, the arduino is fully capable of a 25khz pwm signal. I'd prefer sending out a tested product, so if you do plan on purchasing more fans, could you send one or two to me, then I'll send them to you with the finished product? Also, what kind of enclosure would you want for this? I could also do manual controls if you'd like, which could override computer controls with the flip of a switch, or just act as a fallback. The arduino has six pwm channels, but if I am correct, I think the rest could be hackable for this purpose. Keep in mind this will be my first project for someone else, and I'm not an EE student (yet), just a high school one.
-Garrett
Sure I could send you a fan or 2. I wouldn't need any special enclosure, as long as the PCB has some kind of mounting holes. The PCB is what worries me most, actually, since it will still need a large amount of power going through it, even though it will just be a DC bus. I haven't gotten the fans yet, so I don't know whether they have a mating connector on them or whether they are bare wires. If they are bare wires, then I would just solder the PWM signal wires onto your board, and connect the rest of the stuff to my massive 12v bus. As for manual controls, if something fails you shouldn't need to do anything. With no PWM signal at all, the fans ramp up to full blast. I'll let you know when the fans arrive. |
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BTW, I have a bunch of these left over, if anyone wants them.  |
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No such cable exists because there is no PSU which uses that much power. The cord you are looking for is a C13 to C14. They cost about $1 to $3 in bulk. http://www.monoprice.com/products/subdepartment.asp?c_id=102&cp_id=10228#102280530A outlet -----> 30A PDU (fancy name for powerstrip  ) -----> 5 to 10 rigs If you just want to plug 1 rig into each outlet then you don't need 20A. Plain ole 110V @15A is more than enough to power a single rig.  Exactly. And since I don't have a PDU, this is what I did:  Chopped the end off and put on a 15 amp 240v plug. With a PDU, you can use the link from DeathAndTaxes, above. |
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The largest expense will be putting in several outlets, but if they weren't there already, it shouldn't cost much more than wiring in 120v. Additionally, you may need to buy either new power cords with different plug ends, or new plugs to attach to the ends of the existing cords.
I would only add that you do not need new cords, you can wire regular plugs for 220. Just make sure you mark them very well so you dont plug a fan or a light into them. also, I would use a commercial grade 20 amp outlet when wiring for 220. Well, if you want to be code compliant, this probably wouldn't be a good idea. |
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BTW - What's the model of the fan? 32 channels of 48W is quite insane, that's more than two horsepower. The explosion proof exhaust fan I'm looking at for the paint booth I'm building in my garage is only 1/2HP, and it's rated to move over 4000CFM.
Delta PFC1212DE-F00. 252 CFM each, 32 mmH 2O static pressure, 66 dBA.  I hope you got a great price. Those aren't cheap fans. I assume this is for controlling fans for a large mining farm? Did you look into using larger fans? Something like this decent box fan could give you over 2000CFM on 170W. Ducting would be more of an issue than with individual fans, and static pressure would likely be worse, but if depending on your application that might not be a problem. Control wouldn't really be any tougher than controlling a 12V fan, though you wouldn't get a tach output. You'd use half as much electricity, and the capital costs would be much, much lower. Check out my sig - that's what this is for. They are 120mm each, so I can make a wall of fans 2 high and 4 wide fit into a rack formfactor, and the additional channels are if I want to stack them 2 deep for server-grade redundancy. EDIT: I just realized that in a standard 19" width, I can only have three 120mm fans next to each other, not 4. So that makes my minimum number of channels 6, and my maximum number of channels 24, not 8 and 32. |
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BTW - What's the model of the fan? 32 channels of 48W is quite insane, that's more than two horsepower. The explosion proof exhaust fan I'm looking at for the paint booth I'm building in my garage is only 1/2HP, and it's rated to move over 4000CFM.
Delta PFC1212DE-F00. 252 CFM each, 32 mmH 2O static pressure, 66 dBA. |
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Wow, they are clueless, they are losing on $2,400 here
You make me laugh. There are people lined up down the street, pre-paying for something that will take forever to arrive (as of now), and have ordered so many that they are already on rev3, and you think your non-order will affect something? Not to mention those that have already plunked down 25, 60, 100+k for rig boxes. |
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6x 50W channels with only one molex? Wow. Utopia. Looks like that one actually has 2 molexes, but I still think that is a little low (75 watts each, right?) |
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If the fans work as you describe, I could do that for 22btc and walk away with a nice profit.
All I'd do is program an arduino to output those signals, and be commanded via USB, which I could make an application for.
This all would be fairly easy, so I'd recommend doing it yourself. But if you really want to give me money I'd be happy to do it!
If you don't require actually switching the fans (ie, you have 4pin PWM fans) the difference between 50W and 1W is pretty minimal. A 64 or 100 pin uC would be plenty to run all the channels individually. If you require being able to PWM 32 channels at 4A, that's a more expensive (for hardware) project. Either way, development cost would be similar.
If all you need is to PWM fans manually with basically one setpoint (intake %, with exhaust being set a couple % lower), that would be a little simpler, especially if you're running PWN fans. That you could run with a few FETs, but you'd have less control.
Really, what you're asking for would probably require a custom PCB for 32 channels if you want to individual control. I'm an EE and I've done computer controlled fan controllers, but honestly it's completely not worth my time unless there would be a bunch of people interested in something like this. PCBs have a huge setup cost, so buying 50 units might only cost twice what buying 1 would cost. Likewise, even for a simple one $200 would be minimum wage once you actually get into how much time it would take to develop.
I'd take the 22 BTC offer. It'd be a great deal, you're really not be paying that much more than the hardware cost.
Garr255, how many channels would that be, and would they be individually controlled? It would include some kind of PCB to plug into? Here are the specs for the fans, can an Arduino handle multiple 25khz outputs? http://media.digikey.com/pdf/Data%20Sheets/Delta%20PDFs/PFC1212DE-F00.pdfIn addition, I am not 100% sure if that is exactly how it works, but that is what I inferred from the datasheet. It would of course need a powerful bus that could handle from 400 (8 fans) to 1600 (32 fans) watts, but at least the bus can be static and doesn't need to be power switched. MrTeal, yeah that was my thinking, so I brought it here in hopes that an EE student might take up the challenge to provide something like it. The idea is to start with 4 fans on the intake and 4 on the exhaust, and eventually move to as many as 16 on each side. The fans are rather expensive though  |
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