Bitcoin Forum

EDIT: *** Auction canceled due to forum downtime. All 4 units sold to a private buyer. But I'll be putting up for sale/auction some more BFL units soon. ***

I am selling 4 new BFL SC Singles, that BFL shipped Sep 25, 2013. Actually I must say they're slightly used, as I have been mining with them for half a day already and will continue to do so until I ship them to you.

Here are the test results from a few hours of mining with bfgminer 3.2.1:
Unit #1: 60.0 GH/s, 81°C, 289 W
Unit #2: 51.9 GH/s, 66°C, 252 W
Unit #3: 60.9 GH/s, 72°C, 299 W
Unit #4: 54.8 GH/s, 70°C, 266 W

Ambient (intake) temp was about 28°C. Power draw was measured at the wall with a Kill-a-Watt, while powered by my Corsair TX950 PSU at full load where it should be about 86% efficient. NOTE: I am not selling the TX950!

I have not attempted to tweak these units, so it may be possible for you to get more performance from them.


Start earning as soon as the auction ends (8pm PT on Oct 4, 2013)

Since time is money, especially in bitcoin mining, I want to reduce the uncertainty of when you start earning. You will earn bitcoins as if you had received the unit at the moment the auction ends! I will give you the bitcoins you could have mined between the time the auction ends and the time the shipping carrier first attempts delivery to you.

When you confirm that you've received the unit and there is no problem with it (and you release escrow if applicable), I will check the package tracking and calculate the amount of bitcoins the unit would have theoretically mined (100% PPS, no txn fees, free electricity) and send it to you within 24 hours.

You will not earn bitcoins during the following times:
* Before end of auction
* During the time it might take you to unbox and plug in the unit
* After the first attempted delivery according to the tracking (you are responsible for being available to receive and sign for it)

And of course if you must return it due to damage in transit, you will just get your money back and will not receive any extra bitcoins.


Auction Terms

Pricing and payment is purely in bitcoin, with no regard for any currency exchange rate. Payment is due within 24 hours of end of auction.

Starting bid is BTC8.00 for each unit. Minimum increment is BTC0.20. The winning bidders will pay just the minimum increment above the second highest bid for the respective unit, similar to how eBay works.

You are welcome to bid on multiple units (separately), but please ensure you're not the highest bidder on more units than you intend to buy.

Place your bids in this format:
BTC12.20 for Unit #3
(the BTC symbol is optional)

Bidding ends at 8pm PT on Oct 4, 2013.

You can compare with TAV's 105 GH/s Redhash miners (Avalon clone) that they just finished auctioning for up to BTC22 each:
https://bitcointalk.org/index.php?topic=303379.0;all

These BFL units I'm selling use only half as much electricity per GH/s (~4.9W/GH) as those Redhash units (~9.0W/GH). Buyers of my BFL units here will start earning bitcoins around the same time as Redhash buyers receive their units. So these BFL units are worth more than BTC11 each.


Escrow

I'll gladly use an escrow service if you prefer, and I'm checking out the options. John K is popular and trusted, but he may be too busy lately with other business. OgNasty has offered to provide escrow for this auction, and I believe he'll be able to handle this quickly. I'll pay the escrow fee. If you want to use another escrow, ask me before bidding.


Shipping

Shipping is included in your bid amount.

US buyers only! Considering my offer to cover the downtime of shipping, I don't want to deal with the complexities of international shipping, including APO.

I will ship the units from Rancho Cucamonga, California, on Monday (Oct 7, 2013) or sooner, by the most optimal service, considering expected time in transit and cost. If you have specific preferences, let me know. Signature will be required at delivery.

But you will start earning BTC as soon as the auction ends! (see above)


Included Parts

BFL SC Single
USB cable (~3 ft)
BFL custom power supply with US plug


Warranty and Returns

I guarantee that the unit will be fully functional (and will hash as fast as advertised above within 5%) when you receive it. If not, to get a full refund (including shipping charges in both directions), you must ship it back out the very next business day after you received it, by the same shipping method used to ship it to you, and in the same packaging, unless I agree otherwise.

Beyond that, BFL's current warranty policy reads "This unit’s system board has a lifetime warranty from manufacture defect or component failure." It is my understanding that their warranty doesn't require registration, and that it follows the unit, not just the original buyer. But I take no responsibility for BFL's warranty coverage.

The GH/s figures I quoted above are the 3 hour average hashrates reported by the units, not the pool. See the middle column of the three in this bfgminer screenshot:
https://i.imgur.com/YcA7IUP.png

All 4 units running on the TX950 (not for sale):
https://i.imgur.com/WEbucDE.jpg

What a winning bidder will receive:
https://i.imgur.com/GZqvgTQ.jpg

OgNasty of NastyMining can provide escrow service for us:
https://bitcointalk.org/index.php?topic=303281

Where are they located? If in USA BTC8btc offered for 2 of the 60gh+ reporting miners.

Yes, in hand in USA:

So I'm taking your bids as follows:
BTC8.00 for Unit #1
BTC8.00 for Unit #3

Still available?

Of course. This is an auction, ending 8pm PT Oct 4, and only two units have been bid on so far. Please bid.

8.2 Units 1 and 3

Highest bids so far:

Unit #1 (60.0GH): BTC8.20 by wrawb
Unit #2 (51.9GH): no bids yet
Unit #3 (60.9GH): BTC8.20 by wrawb
Unit #4 (54.8GH): no bids yet

Since this forum was down for the last few days, during most of the auction, I must cancel the auction for now. I'll consider starting another soon. I am still interested in selling these 4 units, so feel free to make offers here in the meantime.

Ill bid 8.5btc on all 4

8.7 for Unit 1 3 and 4

possibly also for unit 2 but will bid on that later...

I received a private offer of BTC40.00 for all 4 units shipped Oct 7, with no pre-receipt mining revenue credit. I plan to accept that offer unless I receive a better offer here in the next couple hours (before 1 am PT).

Proof of that Private message please, it's easy to say I got private offer to get more BTC

I am proceeding with the sale to the guy who offered BTC40.00. Unless that falls through, consider this offer to sell to be withdrawn. I'll update the thread title tonight.

I just received payment for the 4 units.

I have some older units that I plan to sell soon: two 60GH BFL SC Singles, one 30GH BFL SC Little Single, and one 71GH first-batch 3-module Avalon (clocked higher than stock). I'll run some benchmarks before putting up a formal offer to sell/auction, but feel free to make offers now.