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1  Economy / Computer hardware / [WTB] Bitmain 17 series case parts on: April 28, 2021, 12:39:36 AM
Specifically looking for control board enclosures... I need about 30 or so of them.

2  Bitcoin / Mining support / Is the S19 control board compatible with the S17 miner? on: March 05, 2021, 04:56:41 PM
Does anyone know if the S19 control board compatible with the S17 miner? Has anyone tried it and been successful?

I sent the question to Bitmain support a week ago and haven't received an answer.

The instructions for setting up an S19 control board on Bitmain's website say that replacement S19 control boards are shipped with S17 firmware, so it seems like it would work. But it isn't explicitly said anywhere.

https://support.bitmain.com/hc/en-us/articles/900003173106

S19, S17+, and S17 control boards are also sold by ZeusBTC, so I asked them if their S19 board could be used in a S17 and they just replied "No", with no further explanation.
3  Economy / Computer hardware / [WTB] Dead S17, S17 pro, S17+ on: January 26, 2021, 04:13:02 PM
Looking for S17 series miners with dead hashboards.


If you've got multiple miners with dead hashboards, I can help you consolidate good boards into fully working miners and I'll buy the dead ones.


Send me a PM with what you've got and the condition, and I'll make you an offer.

Will pay BTC using forum escrow.
4  Economy / Computer hardware / [WTS] Avalon 3x 1047 and a 1041 on: December 04, 2020, 02:50:53 AM
Looking to sell 4 1047s and 1 1041. One of the 1047s has a dead PSU. I tested it with one of the working PSUs and it runs fine.

They were running for about 6 months at a hosting facility.

Looking for $1750 + shipping + escrow for the lot.

update:

one sold, now looking for $425 + shipping + escrow for each of the 1047s and 1041 with working PSUs, $225 + + for the 1047 with the dead PSU.
Or $1275 + shipping + escrow for the rest.


Three 1047s sold, now looking for $500 + shipping + escrow for the 1047 or 1041 with working PSU.


5  Economy / Computer hardware / [WTB] Non-working S17pro or hashboard for parts on: September 28, 2020, 02:17:41 PM
I'm going to take a stab at repairing an S17pro I have with a dead dashboard, so I'm looking for another dead dashboard, or a dead S17pro to use for parts.




6  Economy / Computer hardware / [WTS] 2x Avalon 1047 on: July 01, 2020, 01:16:05 AM
Looking to sell two Avalon 1047, 37TH @ 2380W. Been running since October in a hosting facility in upstate NY.

Trusted forum escrow is welcome.

Asking $400 each plus shipping plus escrow fee. Payment in BTC.
7  Economy / Computer hardware / [WTS] 2x Avalon 1066 - SOLD on: June 29, 2020, 11:51:36 PM
Looking to sell two Avalon 1066, 50TH @ 3250W. Been running since January in a hosting facility in Labrador, Canada.

Trusted forum escrow is welcome.

Asking $550 each plus shipping plus escrow fee. Payment in BTC.
8  Economy / Digital goods / SOLD [WTS] Bitmain Coupon, $314, 10% max, 1/31/2020 expiration on: November 23, 2019, 04:31:05 PM
Asking $115. Payment via BTC.

Trusted forum escrow welcome at buyers expense.




9  Economy / Digital goods / [WTB] Bitmain Coupons on: November 18, 2019, 11:30:44 AM
Looking to buy "Order Coupons" only through forum escrow.
10  Bitcoin / Mining speculation / Smaller PPLNS pools getting hammered by halving, rebound after? on: October 23, 2019, 06:51:51 PM
I have some gear coming online in the next couple of months, so I have been thinking about what pool to point them at.

I'm not interested in pps pools, so I'm only really looking at PPLNS. The issue is ramp up/ramp down.

For a 20PH pool, ramp up is now 161 days. Looks like diff is going to jump up to 13.6T in a few hours, so it will go to 169. With a bunch of new gear coming online, diff will could be >16T by the end of the year, and ramp up will go to >198 days.

For a 6500PH pool, ramp up at 13.6T diff is only half a day.

With just over 200 days to the halving and difficulty increasing, pointing new gear to a 20PH PPLNS pool means you might barely be fully ramped up before the halving. That means that any new gear pointed to a 20PH pool now will only get about half the reward between now and the halving compared to the 6500PH pool. During the eventual ramp down on the small pool post halving, I'd get only 50% what I put in on the ramp up, so I'd loose 25% of the reward for that 6 month ramp up. As much as I'd like to support the small pool, I can't donate 25% of my rewards for over 6 months, and I'm going to have to go with the 6500PH pool.

Right after the halving though, this is no longer an issue, so I'll start moving my rigs to the smaller pool. I'm assuming many other miners are in the same boat, I'd expect hashrate at smaller pools to take off after the halving.

If a miner fully ramped up on a 20PH pool changed pools now to a 6500PH pool, they might be fully ramped down on the small pool by the halving. But while they ramp down, they'd be fully ramped up on the big pool so they'd earn 1.5X normal on average between now and the halving. That's a lot of pressure for miners to jump ship, but I suspect many would come back after the halving. If a lot of people bail, then the ramp down would get extended further into post-halving, and they'd get less, but still more than sticking it out at the small pool.

Any holes or miscalculations in my reasoning?
11  Bitcoin / Hardware / Canaan Announces 11 Series on: October 12, 2019, 01:33:46 PM
Canaan apparently announced their 11 series the same day as Bitmain announced the S17+ and T17+.

A1166 - 68th at 47 w/th
A1146 - 56th at 57 w/th

No details on when they will be available.

https://news.8btc.com/bitmain-canaan-launch-70t-cryptocurrency-miners-prepared-for-the-upcoming-bitcoin-halving

This article claims slightly different numbers. 70th @ 46 w/th for the A1166 and 58th - 61th for the A1146

https://news.bitcoin.com/4-new-high-powered-bitcoin-miners-revealed/





Update: February batches now posted on https://canaan.io/store/





12  Economy / Service Discussion / Any USA based people here have miners hosted in Canada? on: September 20, 2019, 04:05:05 PM
Any USA based people here have miners hosted in Canada? Just curious if anyone here has done this and if you ran into any issues.
13  Bitcoin / Mining speculation / <$0.05 Power on Natural Gas on: September 04, 2019, 03:39:59 PM
Anyone using a natural gas generator to power your mining farm?

A few years back I got a backup generator that runs on natural gas installed at my home. It's spec. sheet listed the fuel usage, so I did the calculations to see how much it cost to run per kWh and found it came out to about $0.10 per kWh, which is about half of what I pay the utility for electricity. It's a standby generator, so it could not be run continuously, and it's loud enough that my neighbors would kill me if ran it 24/7 anyway, but it got me curious so I did some research on larger prime power generators and natural gas prices around the USA.

Natural Gas Prices by State - https://www.chooseenergy.com/data-center/natural-gas-rates-by-state/

Industrial rates for gas in some states are really low. The lowest right now is Oklahoma, at $2.14/1000 ft^3.

Using $2.14/1000 ft^3, and specs from Generac's website for their large generators that are rated for prime power, I came up with these #s. I estimated the maintenance charges based on ranges this company gave for service contract rates. I did not take into account the cost of purchasing the generator, only the operating cost and gas cost. On the larger side of things, if you could purchase a 2nd hand SG750 for $200,000 (wild guess based on what I'm seeing on ebay...) and spread that cost over a 5 year run time at 75% load, it would come out to $0.00812/kWh.



Generac SG150 14.2L, including $800/per month for maintenance

75% load 112.5kW, $0.0426/kWh
50% load, 75kW, $0.0511/kWh



Generac SG250, including $1000/month for maintenance

75% load, 187.5kW, $0.0349/kWh
50% load, 125kW, $0.0416/kWh



Generac SG450, including $1200/month for maintenance

75% load, 337.5kW, $0.0315/kWh
50% load, 225kW, $0.0351/kWh



Generac SG750, including $1500/month for maintenance

75% load, 562.5kW, $0.0258/kWh
50% load, 375kW, $0.0289/kWh
14  Economy / Computer hardware / [SOLD] Nvidia 1070 and 1080 GPUs -- 1.5 years later and one 1070 8Gb remains... on: August 10, 2019, 07:25:14 PM
Prices do not include escrow and shipping. Ships from Zip code 02494.

---------------------

MSI 1070 Gaming X 8G **** SOLD

Asking $250

The card is in great condition and in original packaging.  I ran the FurMark burn-in test on it for 30 minutes with no issues. Both fans operate smoothly.

edit: been sitting in the box under my desk since I originally posed this 1.5 years ago .... lol.





---------------------

Last 2 Asus 1080s now on ebay but offer here is still valid until it sells.

https://www.ebay.com/itm/273978520544


--------------------

** Sold on Ebay **

Asus ROG-STRIX-GTX1080-A8G-GAMING #2

Asking $290

The card is in great condition and in original packaging.  Warranty is good until 12/3/2020. I ran the FurMark burn-in test on it for over an hour with no issues. All three fans operate smoothly.

https://imgur.com/a/xjDxFvJ


--------------------

** Sold on Ebay **

Asus ROG-STRIX-GTX1080-A8G-GAMING #3

Asking $290

The card is in great condition and in original packaging.  Warranty is good until 12/3/2020. I ran the FurMark burn-in test on it for 36 minutes with no issues. All three fans operate smoothly.

https://imgur.com/a/LkAhjys


--------------------

Gone ... Sold on Ebay.

Asus ROG-STRIX-GTX1080-A8G-GAMING  

Asking $290

The card is in great condition and in original packaging.  Warranty is good until 12/3/2020. I ran the FurMark burn-in test on it for 57 minutes with no issues. All three fans operate smoothly.

https://imgur.com/a/65ofBUA

Now on ebay, but offer here is still valid until it sells.
https://www.ebay.com/itm/273969675401


--------------------

15  Economy / Computer hardware / SOLD [WTS] Older GPUs - FREE on: August 07, 2019, 02:34:34 PM
Going through a bunch of 6000 and 5000 series Radeon GPUs I've had sitting on a shelf for years. I'm testing each one, and will list the rest as I get around to them.

Don't want to go though the effort of testing the rest and listing on ebay, and don't want to send them to the dumpster, so just pay shipping and take one or more batches of 4 or 5 cards.

There are 14 total, 3 of which I've tested an know are working. So for every 4 or 5 you take one can be a tested one.

To estimate shipping, figure cards weigh about 1.5lbs each, and they'll be shipped from zip 02494. I can pack them up and send final box dimensions and weight, and you can email a shipping label.




---------
Untested Cards:
1x - XFX 6950 single fan
1x - XFX 6950 dual fan
1x - Gigabyte 6950
1x - Sapphire 5850
1x - Gigabyte 5850
5x - ATI 5850 Reference
1x - Powercolor AX7790


---------

Tested Cards:
---------

AMD 6950 Reference - $35










---------

XFX 6870 - $25









----------

XFX 6870 - $25













16  Economy / Computer hardware / [CLOSED][WTS] MSI GeForce GTX 1080 GAMING X 8G on: July 27, 2019, 07:52:10 PM
Asking $290, buyer pays escrow and shipping. Ships from Boston, MA USA.

The card is in great condition and in original packaging. Manufacture date is 9/2017 so warranty is good until 9/2020. I ran the FurMark burn-in test on it for 10 minutes with no issues. Both fans operate smoothly.

https://postimg.cc/gallery/13n28v8g0/

https://postimg.cc/gallery/maabzce8/
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