How would you run 5 independent loops off a single channel radiator?
In series, just like I used to do with 4x GPUs. Can easily dissipate 800W+ of heat on the standard 240 rad I was using back then. We don't have 800W of heat, we have 5KW of heat - you simply cant get the flow rate required to do that in series before you get to the radiator due to the internal diameter of the tubing [and pathways in the heatsinks]. You also dont need "specialized" coolant for any sort of watercooling, distilled water changed regularly will work just as well, at $.99 per gallon at your local store if that much.
As usual, I recommend the safe options because lets be honest, what percentage of people are going to decide to spend a few hours to drain, flush, clean and refill their multiple C1s? You will notice I stated a standard 240 rad... that 9x120 rad with push pull could certainly handle 5 of these in series without issue. Infact... I might just do it. You can also use a power powerful pump as Mr Teal pointed out. Ive been in the WC scene for a LONG time, built over 100+ machines needing to dissipate 1000+w inside a normal ATX case, and those parts were much more heat sensitive in delta T than ASICs generally are. By my rough napkin calculations, a radiator with reasonable airflow should be able to dissipate a maximum (ideal) of 900w per 120MMx38MM Rad, giving you a theoretical maximum of 8100W dispensation for that radiator. Obviously I am intentionally ignoring things like airflow and water flow rate, but you get the idea. problem with running in series is that you would likely see temps on each unit increase in succession, with the last unit(s) having the coolant entering at already-high temperatures and offering insufficient cooling. To avoid this, the flow rate (and thus static pressure from the pump) would probably be too much for the C1 waterblocks. better would be to use a properly-valved system to run them in parallel. A valve on each C1's loop would adjust for any pressure/temperature difference between units. ___________________ ___ _ _ _ _ __| || || || || || It could be possible that with a solution like this, the C1 could be employed with a large radiator and pump capable of cooling 10kW+ for <$500 |
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There is a small savings in cost, but IMO the C1 isnt revolutionary by any means, and will ship almost a week later than S3+ units will (which is a ~$20/0.05BTC difference)
Theres a higher risk of leaks and failure with this design i think, and for most people taking up slightly less space, with a large rad dangling someplace, wont offer much benefit as the S3+ is fairly easy to stack on its side anyways.
If someone can point to a 5kW-sized radiator/pump that could run multiple C1 units in parallel for under $150 though, thats a different story
There will be some kits soonish for multiple units, but generally you can't put 5kW of heat in an arrangement like this [easily]. Coolant temps would be too high by the 5th unit, and the head pressure required to go through 5 sets of waterblocks would require pumps in series which is never a great idea. Remember the tube cross section is pretty low, so the minor losses become significant if you try and increase flow rate significantly - which is what you need to cool 5 units on one loop. For now, the shipping on the second individual kit for now is only about $15, so you get the entire kit delivered for about $65. hence why i think parallel tubing with distinct pumps but a common radiator (using a large 480mm, 1000cfm fan or similar) would be slightly more viable to transferring heat. either way, for most users this seems pointless unless you either circulate the hot water into something useful (like heating a pool) or can easily hook 20+ of these units up and be able to transfer the heat 20 feet or so to a convenient opening. |
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2x S3+: 1.07 BTC 0.387 Shipping to US = 1.457 Total 1x C1: 1.0 BTC 0.226 Shipping to US 0.13 (Cooling equipment $50 @ $377/ BTC) = 1.356 It doesn't save that much space since you still need room for the cooler. It's not any quieter since the radiator will still have fans. It's not any more efficient since it is using the same hashing boards. I don't get it. I guess some people just have a hard on for liquid cooling.  corrected your above math - there is a small savings in cost, but IMO the C1 isnt revolutionary by any means, and will ship almost a week later than S3+ units will (which is a ~$20/0.05BTC difference) Theres a higher risk of leaks and failure with this design i think, and for most people taking up slightly less space, with a large rad dangling someplace, wont offer much benefit as the S3+ is fairly easy to stack on its side anyways. If someone can point to a 5kW-sized radiator/pump that could run multiple C1 units in parallel for under $150 though, thats a different story |
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title says it all - looking for cheap but current-gen equipment that is in, or shipped to, Toronto.
must be competitive with the 1BTC/TH/700W equipment shipping now
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Wow what a ridiculous mark up. Someone who has the time and money could likely successfully counterfeit that bar if they so wanted.
Good luck with the sale.
Well that would make them a dick. They can do all that, but they can't sign the address. Making it "unsuccessful".  Tyvm Smoothie How would one sign the address for an unopened casascius coin? Everyone knows the public key, but if you put a fake gold plated bar (easy) with a fake hologram (trickier) it would be almost impossible to tell them apart without providing signed evidence from Caldwell himself (which I imagine there is, but again that verifies the seller, not the bar) |
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When using a RPi, I'd recommend to keep a fully configured second RPi ready to go so in case the first one dies it is a simple plugging exercise to get back mining quickly. (Just make a full backup of the SD card once everything is set up and runs as it should).
If you can't spare that extra 35$, at the very least keep a second SD card ready.
Better yet, immediately exchange any class-6 or lower cards for a class-10. It will help protect the OS during any power outtages, whereas the cheap class4 cards almost always end up being corrupted by a power blip |
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I tried oc 212M set but failed to work, I did a reset. the original power supply can handle 212Mhz?
No, the original supply is pushed near it's limit. For 212mhz you really need a 1200w or better supply since the power draw of 1100gh is around 1050-1150w in the psu |
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Anyone tried underclocking or undervolting these?
Wondered if anything better than 1w/gh can be achieved
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use kijiji if anything - you can probably get $600-700 for it.
Im in Toronto, would offer 1.3 BTC
wow..seen S2 going 300-350 usd , and as low as .5 BTC shipped so jump on that 1.5 BTC not sure where you'd see them that cheap, plus i was speaking in CAD. Offer still open at $600/1.3BTC |
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I would offer you 15BTC for one
I would offer 16BTC - just to help set a bottom to any bidding. IMO the right price could be up around 20-23 but its a weak market right now |
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use kijiji if anything - you can probably get $600-700 for it.
Im in Toronto, would offer 1.3 BTC
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his deal works for anyone with power costs above 40 a month.
he wants 33 x 3 or 99 a unit for power. s-3s in my state cost about 46 or 47 a month in power.
he has a product that works for some of us.
Me I do almost no mining just 6x s-3's .
I did something I do not normally do I purchased coins. I am looking for coins to go back up to 600 then sell some off.
And anyone who is ok with a month to two old unit. They are in the data center with DIRT FLOORS. He literaly is going to have down time to clean dirt out of miners! Do not forget this is a batch 2 S3. Discounts were given as not all got 440 GHz. The normal range is 420-440 with batch 1 and 2. If you buy direct from bitmain you get a S3 PLUS with up to 60 GHz more, and it has better resell value. If you truly want to host in his dirt floor, dusty, hard on miner center your better off shipping a new S3 + to the data center. Dont get these used hard batch 2's from a dirt data center. He wants rid of these so bad hes temporary has put sold out on 1T and 1.5 T dragon. I just want to throw in my 2c about S1/S3 reliability. Most of the Batch 2 S3 units i have are still running fine. Of 5, 2 clocked to 500GH, 1@475GH, 1@440GH, 1@425GH. The overall average speed was appreciable. They have run for several months, and are looking well on track to a positive ROI, especially if you consider the resale value in BTC right now. They have accumulated dust (its a good environment but not perfect), and its shown no harm, other than slightly louder, fuzzy fans. I ran S1 units in some of the dustiest conditions (floor level over carpet) for over 6months without any issues (dusty fans draw more power and get loud trying to keep the machine cool of course) to the hashing speeds and reliability. The S3 should handle it even better with 2 fans and a case. IMO its not a bad deal, considering i pay $0.15/kwh right now |
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THE BEARWHALE BULLWHALE
Here's a thought - what if the bearwhale was actually a bullwhale?
1) dump some coins and put a massive 30k sell order wall at $300
2) purchase some long position calls on bitfinex or elsewhere.
3) eat it away using at least one other account, including an 11k purchase. Includes buying any coins being sold below $300.
4) remove the sell order for the last ~10k coins
5) watch the markets increase by 50% in a week, while still holding most of the original number of coins, plus extremely high-profit calls.
seems like by sacrificing ~10k coins to others at $300, the bullwhale effectively reversed the price decline, increasing the value of the remaining coins and probably selling the call positions for a tremendous profit.
is this feasible, or is the bearwhale just a bearwhale?
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S4 PSU issues ? Can Bitmain please advise the community as to what is up with the Power Supplies ? I just lost my first S4 and it was just installed less then 7 days ago . http://postimg.org/image/xp75t9jx1/This is a real letdown because for every day I have to deal with a RMA or tech support I totally lose out on ROI .. that is an ugly job. IMO, buy a new PSU (or pair of PSUs), and power it from those for the meantime. Underclocking slightly should make it operable with an EVGA 1300 |
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Hes already pulling a lot of density. Unless he can somehow duct out all of the hot air, im pretty sure hes capped to capacity due to not having a hot/cold isle containment.
Well, building any datacenter-like facility without hot/cold aisle containment is both inefficient aswell as outdated. It might be cheaper in the short term, but the increased footprint aswell as less efficient cooling and miners not profiting from optimal temperatures is more expensive after 6 months. I guarentee that those Sp-30 miners are being properly exhausted. 9 SP-30 miners is about 30kW in a single rack, which is a LOT. If there is not some sort of exhaust fans located directly behind those racks than that building would be absolutely sweltering without a hot/cold aisle config. spreading out the miners means lower temperatures for better hashrate, and the benefit of getting even an extra 500GH per rack that way more than covers the cost of buying extra racks to fit all the equipment. IMO, the setup is pretty ideal - judging by the size of the building, theres not much harm in taking up a little more space with extra racks |
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"Mmmm hashrate" indeed... Not mine. QG So thats where all the money went... This is a client's, not mine. There are about ~190 machines total, not sure if all of them made it into the pic. ~855TH .57KW how are those wired? looks like PDU plugs coming down from above, but I've found that a 30A PDU will usually have only 4-6 of its 20+ outlets occupied by miners - making them cost-inefficient somewhat |
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"Mmmm hashrate" indeed... Not mine. QG So thats where all the money went... Thats roughly 8*22*4.5 = 792 THash, at perhaps 400kW. is that right? |
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IMO ive been able to make a profit from my 10kW farm, which was built using about $2500 in costs (wiring, fans, shelving, PDUs, cables, switches, PSUs).
Im still running about 8.25 TH / 7.5kW and have only about 5BTC to go before I break totally even, considering electricity costs over the past year. At that point I will still have 4-5BTC worth of mining equipment operating and about $1200 resale value of PSUs/PDUs plus permanently installed 208V and 120V circuits where there were none before.
Its easy to see how an operation 10x this size could afford rent but not employment, and at 20x the size could likely cover a small paycheck for someone to provide management/servicing
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looks like the difficulty increase may clock in under 1% - needless to say im pretty pumped about that, though my mining farm is below capacity due to a lack of hardware prices worth purchasing
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I want to get some of the 24" PCI-E cables with 16AWG wires for my Zeus Thunders.
16 cables and basic US shipping = $50
where do i send the BTC?
Send me a PM - i am afk right now but can provide an address this evening |
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