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Author Topic: Selling $100k+ 50ghs+ Bitcoin Mining Operation w/ 104x 6990s [CLOSED]  (Read 4919 times)
btcx
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February 19, 2012, 06:00:21 PM
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I have 25 complete, built and running 3x 6990 mining rigs (about 2100 mhs each), and another 29 loose/new 6990s, as well as some other bits that could probably make 5 more complete rigs. Well over $100,000.00 USD put in to this operation. All are located in Tennessee but I'm willing to have them delivered just about anywhere in the US/Canada. I'm seeking one, or a combination, of two options:

1. Sell all the gear outright for something in the area of $75,000.00 USD. Willing to do payments over time for a trusted party.
2. Find someone with the knowledge, time, infrastructure and cheap power (< $0.10/kwh) to run and maintain these systems. Willing to split a share of the mining rewards.

I might be willing to break the sale of the systems up but probably wouldn't do less than 3x $25k.

If you have any interest, please post here or PM me on this forum or over at Ogrr.com

Original post w/ pics:  https://ogrr.com/viewtopic.php?f=74&t=1139

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February 19, 2012, 06:12:05 PM
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I am looking on how much my garage can handle...i will post later... Wink
btcx
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February 19, 2012, 06:16:56 PM
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You are going to need about 400 amps to handle these 25 machines @ ~16 amps each.

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February 19, 2012, 06:32:46 PM
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Wow. $100k for 60Gh.  Shocked

I could potentially host this equipment for you, but it would require a significant upgrade of either the HVAC or a new ventilation system. There would also be expenses for racks, wiring, electricial and probably another dedicated room for rigs.

I am assuming that your quote of 16 amps per rig is including the 20% overhead as my calculations show these rigs should be pulling about 12 amps at 120 volts.

My facilities include a three phase 200 amp service so at 208v each rig should pull about 7 amps. Looks like I could run 4 rigs per 40 amp circuit with this configuration leaving plenty of spare room on each circuit.

PM if you are interested. There would be a lot of details to work out but it is doable.

EDIT:

My base power rate is $0.07585/Kw for the 208v.
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February 19, 2012, 06:48:35 PM
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yeah, sorry.. these should be about 12.5-13.5 amps each, 120v @ 1500-1600w.  I think we were getting around 2.4 ghs per machine @ ~1600w.

What your overhead will be will depend a lot on your space/setup.  These guys have a pretty good one:  http://www.youtube.com/watch?v=G5f_e4P6gMA




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February 19, 2012, 07:01:54 PM
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yeah, sorry.. these should be about 12.5-13.5 amps each, 120v @ 1500-1600w.  I think we were getting around 2.4 ghs per machine @ ~1600w.

What your overhead will be will depend a lot on your space/setup.  These guys have a pretty good one:  http://www.youtube.com/watch?v=G5f_e4P6gMA

Their ventilation works because the rigs are in a very large warehouse. A ventilation system like that would also need to have an intake in my space, as I have 800 sqft. Another thing to consider is that I am in FL which means if you are pulling a lot of air in, the humidity would fluctuate in the ventilated space quite a bit.
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February 20, 2012, 12:53:58 AM
 #7

Out of interest, any pics of the existing systems in their current form? I am particularly interested in whatever cooling arrangement you currently have. I have access to some used 10 ton CRAC units, and about 600 amps of 480 VAC, but I can't really get my head around how much physical space this might take up.

Mining Rig Extraordinaire - the Trenton BPX6806 18-slot PCIe backplane [PICS] Dead project is dead, all hail the coming of the mighty ASIC!
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February 20, 2012, 01:10:10 AM
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Unfortunately, the pic you saw of them all stacked together in the garage is a pic of them in their current form.  They're all offline and will not be reassembled in to their mining form.  If you could do a setup like the guy in the above video, they won't take up that much space.  It all comes down to your available power density, cooling/ventilation setup.

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February 20, 2012, 01:22:49 AM
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Unfortunately, the pic you saw of them all stacked together in the garage is a pic of them in their current form.  They're all offline and will not be reassembled in to their mining form.  If you could do a setup like the guy in the above video, they won't take up that much space.  It all comes down to your available power density, cooling/ventilation setup.
Yeah... I guess it isn't so much about density, as it is about convincing the owner of the location to rent me the space and pay for the power at a decent rate. I'll have to sit on this one for a bit and run some numbers.

Mining Rig Extraordinaire - the Trenton BPX6806 18-slot PCIe backplane [PICS] Dead project is dead, all hail the coming of the mighty ASIC!
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February 20, 2012, 01:32:04 AM
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I have the funds to take a lot off your hands if you decide to use multiple buyers at 25K or so but in that other thread you quoted 6990s at about $200 above market price for singles so not sure what your expectations really are.. In any case if you decide to split into a couple of large shipments I'll be standing by..

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February 20, 2012, 03:20:06 AM
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I have the funds to take a lot off your hands if you decide to use multiple buyers at 25K or so but in that other thread you quoted 6990s at about $200 above market price for singles so not sure what your expectations really are.. In any case if you decide to split into a couple of large shipments I'll be standing by..

You're right.. I can't find any 6990s for sale at retail but I think the last price I paid was $700 a piece.  I don't know if there is still a premium for them but 104 cards * $700 = $72.8k.  So, there are really 2 components to this:  25 rigs, 29 extra 6990s + other hardware.  The 29 cards might not be that hard to flip for $20k.  In determining whether and how to split up the rigs, I'm considering how much of a hassle it's going to be to get them to the new owners.  They're all in Tennessee now.  Where are you?

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February 20, 2012, 03:27:26 AM
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Yeah... I guess it isn't so much about density, as it is about convincing the owner of the location to rent me the space and pay for the power at a decent rate. I'll have to sit on this one for a bit and run some numbers.

Unless you can find a former data center or something, getting the concentration of power you need could prove difficult.  Sure, if you've got a giant house, you could put one machine in each room but then you have to deal with cooling and ventilation and trip hazards for the entire house.  Ideally, you can get 400 amps coming off of one wall, where you can box them all up, cool them without cooling your entire building, and shoot the exhaust outside.  Really, this probably won't make sense for anyone spending > $0.07/kwh.

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February 20, 2012, 03:32:02 AM
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Bloom Energy can reduce your energy costs by 40%-60%. Works for Ebay at their San Jose campus.
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February 20, 2012, 03:41:21 AM
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Yeah... I guess it isn't so much about density, as it is about convincing the owner of the location to rent me the space and pay for the power at a decent rate. I'll have to sit on this one for a bit and run some numbers.

Unless you can find a former data center or something, getting the concentration of power you need could prove difficult.  Sure, if you've got a giant house, you could put one machine in each room but then you have to deal with cooling and ventilation and trip hazards for the entire house.  Ideally, you can get 400 amps coming off of one wall, where you can box them all up, cool them without cooling your entire building, and shoot the exhaust outside.  Really, this probably won't make sense for anyone spending > $0.07/kwh.
It is a former datacenter actually! Grin However it has since been converted to office and warehouse space. I would need to find out whether the owner would mind it becoming a datacenter again Cool

I think the power here is $0.09/kwh before taxes and shit, so it probably wouldn't be the most ideal location in terms of time to recover cost - especially when running air conditioning to keep things working in the summer. I may have to pass on this one, damn my location's power rates Sad (Central Ohio)

Mining Rig Extraordinaire - the Trenton BPX6806 18-slot PCIe backplane [PICS] Dead project is dead, all hail the coming of the mighty ASIC!
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February 20, 2012, 09:31:52 PM
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I have the funds to take a lot off your hands if you decide to use multiple buyers at 25K or so but in that other thread you quoted 6990s at about $200 above market price for singles so not sure what your expectations really are.. In any case if you decide to split into a couple of large shipments I'll be standing by..
You're right.. I can't find any 6990s for sale at retail but I think the last price I paid was $700 a piece.  I don't know if there is still a premium for them but 104 cards * $700 = $72.8k.  So, there are really 2 components to this:  25 rigs, 29 extra 6990s + other hardware.  The 29 cards might not be that hard to flip for $20k. ...
Last 3 6990 sold for ~600$ on ebay, so selling them one by one is most likely to get you ~17k

The actual mining value for these card for mining only is low,  many 5970 sold for 300$ a month ago and they are better than 6990,  ... 5850-5870 130-170$ (375-450mhs)

I suggest you sell all of these ASAP before the price collapse another 100$.  The new 7970 sell for less than 600$, has better resell value, higher efficiency and almost the same hash-rate.
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February 20, 2012, 09:42:52 PM
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Yeah... I guess it isn't so much about density, as it is about convincing the owner of the location to rent me the space and pay for the power at a decent rate. I'll have to sit on this one for a bit and run some numbers.

Unless you can find a former data center or something, getting the concentration of power you need could prove difficult.  Sure, if you've got a giant house, you could put one machine in each room but then you have to deal with cooling and ventilation and trip hazards for the entire house.  Ideally, you can get 400 amps coming off of one wall, where you can box them all up, cool them without cooling your entire building, and shoot the exhaust outside.  Really, this probably won't make sense for anyone spending > $0.07/kwh.

Nobody would consider putting them on house circuits.  A subpanel & dedicated circuits @ 240V makes it a lot more manageable.  Even if you had them in multiple rooms you would need to look at running 1 (or more) dedicated high current circuits to each room.  Cooling is less of an issue if you have a decent sized room.  Just drop in a dedicated AC unit.  They make split units up to 50K BTU.

The largest issue in a residence is mains current.  Most homes don't have mains capable of more than 100 @ 240V = ~20KW continual load.  You can get that upgraded to 150A to 200A but it tends to be pretty expensive.  Setting up a 60A dedicated subpanel @ 240V and leaving the rest for house normal load mean you probably are limited to around 20 GH/s in most residences.  Still more than do-able for the quarter lot ($25K for ~12.5GH/s).
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February 21, 2012, 03:59:51 AM
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yeah, sorry.. these should be about 12.5-13.5 amps each, 120v @ 1500-1600w.  I think we were getting around 2.4 ghs per machine @ ~1600w.
If three 6990s are pulling 1500-1600W, the clocks/voltage used were horribly inefficient.  1000 watts should be no problem with the appropriate voltage and clocks.



Nobody would consider putting them on house circuits.

The largest issue in a residence is mains current.  Most homes don't have mains capable of more than 100 @ 240V = ~20KW continual load.  You can get that upgraded to 150A to 200A but it tends to be pretty expensive.  Setting up a 60A dedicated subpanel @ 240V and leaving the rest for house normal load mean you probably are limited to around 20 GH/s in most residences.  Still more than do-able for the quarter lot ($25K for ~12.5GH/s).

Eh?  Most of the homes here have 200A panels by default (except for the very small or older homes).  Many town homes and duplexes even have 200A service run to their panels.  It's done in case someone wants to run electric heat.  Go somewhere where the winter gets very cold...  the homes are all wired.  I'm running 45Ghash and I've still got a little over 100 amps (at 240V) to spare.

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February 21, 2012, 10:27:51 AM
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PM'd you on the other forum.  That's crazy!

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February 21, 2012, 01:38:30 PM
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Eh?  Most of the homes here have 200A panels by default (except for the very small or older homes).  Many town homes and duplexes even have 200A service run to their panels.  It's done in case someone wants to run electric heat.  Go somewhere where the winter gets very cold...  the homes are all wired.  I'm running 45Ghash and I've still got a little over 100 amps (at 240V) to spare.

Hmm guess it is different in different parts of the country.  Around here natural gas is common for cooking, hot water, and heating.  Really the only high current device most homes have is an AC.  Maybe that has something to do with it.  Wouldn't expect to see many heatpumps (and thus high current mains) where winters get very cold because heat pump efficiency is dependent on outside air temp (lower air temp = less concentrated thermal energy to pump).

If someone has a 200A panel no reason they can't run a large farm but it would make sense to drop some dedicated 240V, 30A circuits to avoid overloading rest of house breakers.


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February 21, 2012, 01:55:57 PM
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I would be interested in hosting these for you for a percentage. PM me if interested.

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