Bitcoin Forum

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

I am looking on how much my garage can handle...i will post later... ;)

You are going to need about 400 amps to handle these 25 machines @ ~16 amps each.

Wow. $100k for 60Gh.  :o

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.

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.

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.

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.

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?

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.

Bloom Energy can reduce your energy costs by 40%-60%. Works for Ebay at their San Jose campus.
https://bitcointalk.org/index.php?topic=63670.0

It is a former datacenter actually! ;D 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 8)

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 :( (Central Ohio)

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.

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).

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.





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.

PM'd you on the other forum.  That's crazy!

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.

I would be interested in hosting these for you for a percentage. PM me if interested.

Interesting.  I guess the combination of the extremely cold winters and cheap electricity has something to do with it.  As far as the heat goes, I could certainly burn up 100A to heat my home in the winter here.  It wouldn't be drawn full-time obviously, but if I wanted to match my gas furnace in BTU output, I'd need 97A @ 240V.



Of course.  You'd run out of power in no time trying to do this.  I run two 50A sub-panels.

200 amps is typical here. Quebec has extremely cheap electricity.

Probably.  I guess if electricity is cheap enough it can displace all other forms of energy.

Cold winters and cheap electricity.   That is a Bitcoin miner's dream :)

FTFY.

I can haz North Pole + Geothermal energy? ;D

And a fibre line under the ocean. :P

I might be able to help you out.  I'll PM you with details of my setup and what upgrades are coming

Has anyone gotten a reply from a PM ?

Sent him a PM on reddit, ogrrr and here, 2 days ago and nothing.

Some people have been asking for exact specs so here it goes.  Also, updated offer at the bottom.


Case (1):
1 x ($125) COOLER MASTER HAF 932 Advanced RC-932-KKN5-GP Steel ATX Full Tower Computer Case with USB 3.0, Black Interior and Four Fans-1x 230mm front RED LED, 1x 140mm rear, 1x 230mm top, and 1x 230mm side
http://www.newegg.com/Product/Product.aspx?Item=N82E16811119160


PSU (3):
1 x ($220) Antec TPQ-1200 1200W Continuous Power with PowerCache Technology SLI Ready CrossFire Certified 80 PLUS SILVER Certified Modular Active PFC Power Supply
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371032
AND
1 x ($135) OCZ OCZ-ZX850W ZX Series Modular Power Supply - 850W, 80 Plus Gold, 140mm Fan, Active PFC, SLI & CrossFire Ready
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=7213993
AND
1 x ($15) Bitspower X-Station Multi-PSU Active Module (Color - Various)
http://www.performance-pcs.com/catalog/index.php?main_page=product_info&products_id=23350
(note that this device did not work as intended.. I'm told that a newer version does.  We ended up using it just to jump the 2nd PSU to always-on, plus lights look cool).


Motherboard (1):
1 x ($180) MSI 890FXA-GD70 AM3+ AMD 890FX SATA 6Gb/s USB 3.0 ATX AMD Motherboard
http://www.newegg.com/Product/Product.aspx?Item=N82E16813130274


CPU (2):
1 x ($60) AMD HD700EOCK3DGI Phenom II X3 700e Processor - Triple Core, 6MB L3 Cache, 1.5MB L2 Cache, 2.40 GHz, Socket AM3, 65W, No Fan, OEM
http://www.tigerdirect.com/applications/searchtools/item-details.asp?EdpNo=186118
AND
1 x ($20) COOLER MASTER Hyper TX3 RR-910-HTX3-G1 "Heatpipe Direct Contact" 92mm CPU Cooler
http://www.newegg.com/Product/Product.aspx?Item=N82E16835103064


Memory (2)
1 x ($28) G.SKILL 2GB (2 x 1GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10600) Dual Channel Kit Desktop Memory Model F3-10600CL8D-2GBHK
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231134
OR
1 x ($27) Kingston 2GB (2 x 1GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10600) Dual Channel Kit Desktop Memory Model KVR1333D3K2/2GR
http://www.newegg.com/Product/Product.aspx?Item=N82E16820134788


Video Card (3):
3 x ($735) MSI R6990-4PD4GD5 Radeon HD 6990 4GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card with Eyefinity
http://www.newegg.com/Product/Product.aspx?Item=N82E16814127574
OR
3 x ($740) GIGABYTE GV-R699D5-4GD-B Radeon HD 6990 4GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready Video Card with Eyefinity
http://www.newegg.com/Product/Product.aspx?Item=N82E16814125370
OR
3 x ($725) XFX HD-699A-ENF9 Radeon HD 6990 4GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready Video Card with Eyefinity
http://www.tigerdirect.com/applications/searchtools/item-details.asp?EdpNo=55285


Storage (1):
1 x ($6) Team Color Turn 4GB USB 2.0 Flash Drive (Purple) Model TG004GE902V
http://www.newegg.com/Product/Product.aspx?Item=N82E16820313060
OR
1 x ($6) Kingston DataTraveler 100 Generation 2 4GB USB 2.0 Flash Drive Model DT100G2/4GBZ
http://www.newegg.com/Product/Product.aspx?Item=N82E16820139291


Extra Stuff (3):
1 x ($10) Arctic Silver ACN-60ML (2-PC-SET) Thermal material Remover & Surface Purifier - OEM
http://www.newegg.com/Product/Product.aspx?Item=N82E16835100010
AND
1 x ($13) ARCTIC COOLING Arctic Cooling MX-4 AC-MX4 4 gram (g) All-Around Thermal Compound
http://www.newegg.com/Product/Product.aspx?Item=N82E16835186038
AND
1 x ($7) Gardner Bender 11 In. Natural Nylon Cable Ties (Pkg. Of 100)
http://www.homedepot.com/h_d1/N-5yc1v/R-100015143/h_d2/ProductDisplay?catalogId=10053

Estimated total cost of each machine, not counting time/labor/shipping/tax:  $2963.00

25 machines x $2963 = $74075, discount @ 25% = $55,556 = $2200 each.
29 extra 6990s x $725 = $21025, discount @ 25% = $15,769 = $540 each.
Total = $71,000.
Take it all and I deliver within US for $65,000.
Take it all and pick it up in Tennessee for $60,000.
I will consider a payment plan of up to 6 months for trusted individuals who wish to take it all.
I will consider a reward split maintenance agreement for some one with power <= $0.06 kwh.

I almost went with something similar a few months ago (smaller at ~20GH planned), but couldn't make it work with my power costs.  I hope you're able to work out a deal.  Good luck!

I have the ideal place for this.  I have a 2000 sq foot unfinished basement,  with 2 200 amp circuit panels.  Electricity with taxes and everything is about .11.  My basement stays cool in the winter and cool in the summer.

Talk to amzingrendo. Hes is the only miner with a stable op, facility and CHEAP power. Good guy too. Trust him in my home.

why do you have 1200W AND 850W ?

You could run those on a 1200 easily.

measured pull is up to 1600w

$100k?  Damn dude, congrats.  You have as much mining equipment as my student loan debt (edit:  excuse my horribly constructed sentence).

^this.



If you're only getting 2100Mhash out of each rig and drawing up to 1600W per rig, you're doing something wrong.

I have 11 rigs with 4 6970s each and they are getting 1580Mhash @ 683 watts.

If I crammed 6 6970s into a rig, I'd get about 2370Mhash/sec at just under 1000 watts.

Since the 6990s have two of these chips on one PCB, the wattage would be slightly *lower*.

Get those clocks/voltages fixed.  1.31Mhash/watt on 6990s is miserable.  Better yet, send them to Idaho and let me run them.  :)  Commercial rates are *FOUR* cents per kilowatt.  :D  Cold winters and dry summers (evaporative cooling > AC any day).  I'm currently running 45Ghash and can cool it with 560 watts of fans+pumps in the summer (paying nothing for cooling in the winter.  Heating my house, actually).  I'd buy them, but your rigs cost almost 3 times what I paid for my 45Ghash equipment.  They're certainly well built though.

Any pics of your setup?

Maybe you need to re-consider that investment? :)

 :D  It was those years I spent at the University of California as an out of state student.  In state = ~$8000/yr.  Out of state = ~$25,000/yr.

That is one of the biggest problems with our higher education system out here. I live in California and was amazed when my friends told me what their tuition was compared to mine. Even worse, when I moved to Australia, I payed less as a student there than their own citizens.

Out of curiosity, what cases are those on that picture? Are those Haf X cases? Were you running them with the cases closed? And what kind of temperatures were you getting on the 6990s with what kind of ambient temperature? And one last question: What PSU are you using?

Thank you very much in advance :)

Just found out what you're using in the original topic, impressive stuff! I see you modded those HAF 932 cases so they could house 3 cards with enough spacing between them for fresh air. Clever! Wouldn't a Haf X case be easier/better since they would work exactly the same unmodded? Ah, well, I digress.

Could you still please tell me whether you ran those cases open or closed? And what kind of temperatures you were getting in what kind of ambient temps?

Thanks again :)!

I think the HAF X would have been easier, yes.  I don't remember why we didn't get those.. maybe they weren't available at the time.  Temps stayed lower with the cases closed, and temps will depend a lot on what your external temps are.  I don't remember what those temps were.

I've managed to work out a deal with someone on the forums to take all these rigs off my hands.  Thanks everyone for your interest.

Btw, we could use some help testing our our DGM pool, which is currently at 47gh and paying a 5% bonus:  https://ogrr.com/viewtopic.php?f=373&t=1042