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1  Economy / Computer hardware / [SOLD][UK] BFL Little Single - ~32Ghash/sec - In hand on: September 12, 2013, 06:33:44 PM
I have (another) ASIC to sell. Originally paid for at the start of October, my circumstances have changed and I can no longer mine long-term. It arrived today, and I will have this unit hashing away until it sells, but would like to sell it sooner rather than later.

Happy to use escrow if desired, but anyone other than John K will need justification. I've done deals without issue and without escrow on the forums before, and you can also look at my OTC Feedback.

ASICminer blades are currently going for a minimum of 4.5BTC/10Ghash, so I'm looking for around 13 BTC including delivery for this unit. I'll send it next day delivery as soon as I can after payment is received (which will be no more than 24 hours).

If you have any questions, feel free to ask.
2  Economy / Computer hardware / [SOLD][UK] Avalon Batch 2 Unit - Stable at 83GH/s - Upgraded PSU - Reduced price on: July 29, 2013, 08:32:38 PM
Currently have this advertised on OTC, cross posting to here. I'd prefer to keep this in the UK, but will entertain offers from Europe.

It hashes with no problems at all. Running conman's latest firmware, and it is currently overclocked to 353Mhz chip speed, and is operating at 83GHash without any issues.

Happy to use escrow if desired, but anyone other than John K will need justification. I've done deals without issue and without escrow on the forums before, and you can also look at my OTC Feedback. I currently have it listed on OTC at 140BTC delivered, but that is simply the price I would sell it at without further consideration. I am open to reasonable offers. Don't hesitate to ask further questions.

EDIT 1: As mentioned below, the PSU has been upgraded, and you will receive all the unused cables from the AX1200 in their original box. It also fear that the 140BTC price I mooted above has been scaring people off. Other (not upgraded) units in the forums have been going for 120BTC in the last few days, but even this seems high. I am therefore revising my 'Buy it now' price to 105BTC. I still welcome offers, however.

In addition, if escrow is not used, as soon as the BTC is received, I will set the machine mining at the pool(s) you specify for at least one week before I ship it to you. This will have to be done on a pool such as Eligius with openly available statistics.

Edit 2: Now sold. Thank you for the interest.
3  Alternate cryptocurrencies / Altcoin Discussion / Vircurex to remove all non-BTC trading pairs on: May 24, 2013, 05:41:50 AM
Announcement on various changes we will be releasing in the coming days:
2. Remove any-2-any trading
Due to the lack of volume and the need to restructure our screen layout we have decided to remove all trading pairs that do not include BTC. I.e. we will be offering only trading to and from BTC in the future. All other trading pairs will be discontinued and all open order deleted.

Implementation timeframe: 25th or 26th May.

I found this last night in the Vircurex announcement thread. There has been no such announcement on the main site, despite the imminent changes. I for one am strongly against these changes, but I thought a greater visibility for this incoming change was required. I would be interested in knowing how many other people feel the same way; there's already a topic about this in another subforum (, but I thought it warranted one here too.

I've emailed letting them know my opinion on these changes, and I suggest that anyone who feels strongly about it do also. 'The need to restructure our screen layout' is just about the worst justification possible - form should follow function, not vice versa. As I posted in the other thread, the ability to trade any/any is the major reason why I use VirCurEx, and I regard this ability as the distinguishing feature of VirCurEx. Should this ability be removed, I will be taking my custom elsewhere. I am sure I am not the only one.
4  Alternate cryptocurrencies / Altcoin Discussion / [ANN] CryptoSwitcher - Automatically mine the best coin. on: April 10, 2013, 07:00:30 AM
What is CryptoSwitcher?
You've heard about these altcoins, and none have them have taken your fancy; you think they're all clones and destined to failure. You think BTC is the one true way, and are still mining it. The altcoins aren't useless to you. Many of them are more profitable to mine short-term than BTC if you just sell them at the market price.

How can I used it?
The source is available at Clone it, and then edit the cryptoswitcher.config.sample file as it instructs in the comments. If you wish to use BTC-E, you will need to edit the 'key.sample' file to contain your API key, and move it to 'key'. The README included should be a bit more comprehensive than the instructions here. If you already have scripts to start and stop mining, then setup should be easy for you.

How does it work?
The actual maths is done by the websites: (Vanity address mining only - down at the moment?)

This is just a wrapper to use the above sites to pick the most appropriate mining activity for your hardware, and make sure that it's doing the right thing for you. It's written in Python, and uses scripts (which the end-user must write, in the language of their choice; some samples are included) to stop other miners and launch the appropriate one.

Isn't this a terrible idea?
Maybe. I honestly haven't decided whether coin-hopping is a bad thing long term. The consequences of wide-spread adoption that I can think of are:
  • This would tie the value of all alt-coins to BTC.
  • It would cause massive difficulty spikes as retargets happen, causing mining an alt-coin to become less profitable and hoppers to mine elsewhere. The dedicated miners on that coin are then left with a much higher difficulty than they should have, and struggle to find blocks. We have seen this happen already with TRC, which is still struggling to deal with the aftermath

The closest parallel to this I can think of is pool-hopping. However, pool-hopping eventually brought about good - nearly all hoppable pools eventually moved from proportional payouts to an unhoppable payout scheme (e.g. DGM), and pool hopping died as an art, despite the best efforts of P4Man and others. I feel like the same should happen here; if an alt-coin is unable to convince people of its merits such that it is mined regardless of profitability compared to mining the more accepted BTC - or is unable to deal with the consequences of not doing so - then perhaps it doesn't deserve to succeed.

I think this is probably the most contentious issue with this project, and is probably going to get worse as BTC difficulty continues to rise with the advent of ASICs, and people with outdated hardware look to put it to use. I welcome input on this particular aspect.

  • Support for both Dustcoin and Coinchoose, and all the coins they list (though only one site may be used at a time)
  • Takes merged mining into account if you say its available
  • Will automatically sell coins for BTC on BTC-E and/or Vircurex if you choose.

  • Vircurex support
  • Use both Dustcoin and Coinchoose at the same time?
  • Use the CGMiner API to switch between coins with the same hashing algorithm in one CGminer instance. If a user were to allow remote API access, then this could in theory be provided as a service, without the user having to run the script themselves.
  • Monitor miners for dead pools.
5  Economy / Computer hardware / [WTS] [Europe] 1200W Corsair PSU on: February 18, 2013, 06:43:07 PM
Two reference 7970 cards, one MSI and one Sapphire. I've been mining with them since I bought them last year, and they've been nothing but a pleasure to work with. Looking for 240 each shipped in the UK, payment in BTC, which is going to be around 14BTC depending on what happens with the price of bitcoin. I will provide a discount if they are purchased together. There will be an extra shipping charge if someone wishes to buy them from outside the UK.

They've been running at 930Mhz clock, 800Mhz memory and default voltages. Temperatures have been kept in the low 70s with fans hovering around 50% depending on ambient temperature.

Cards come boxed.

OTC order:

Any questions, feel free to ask.

EDIT: I also have a Corsair AX1200 to sell, which has also done sterling service powering the above cards and others in its time. Would be looking for 9BTC shipped, though it will be powering the above cards until they are sold either here or later on eBay. If you would like all three items, I'm sure we can come to some arrangement.

EDIT 2: 7970s provisionally sold. Corsair AX1200 still available; please feel free to make an offer.

Just the Corsair AX1200 to sell now. Looking for in the region of 160 for it.
6  Economy / Trading Discussion / What do you use to track your Bitcoins and investments? on: June 18, 2012, 02:13:56 PM
I've started this topic inspired by a post over on Reddit, where essentially a user was asking for recommendations for accounting software that supported Bitcoins.

I use a Google Doc spreadsheet to keep things straight, but are there any better / more advanced solutions that users here take advantage of?
7  Economy / Speculation / Bitcoinica API Python Interface on: January 22, 2012, 11:23:56 AM
As I mentioned here, I've written an interface for the Bitcoinica API in Python, after not finding one out in the wild. I've now cleaned it up a little, and put it up on GitHub for all to use. It's fairly bare-bones, but hopefully some people here will find it useful. Any suggestions to improve it will be welcomed.
8  Other / CPU/GPU Bitcoin mining hardware / Ubuntu 11.04, Dual 5850 issues on: July 08, 2011, 07:40:06 AM
I'm trying to get dual 5850s up and running on Ubuntu 11.04 and having a great deal of trouble. As soon as I run

sudo aticonfig --initial -f --adapter=all
towards the end of a guide such as this one and restart, I am no longer able to boot. Using an xorg.conf of my own, I am able to boot, and I even see both cards when I run

aticonfig --list-adapters
* 0. 01:00.0 ATI Radeon HD 5800 Series
  1. 02:00.0 ATI Radeon HD 5800 Series

* - Default adapter
However, any other command using aticonfig seems to balk at the second card:

aticonfig --odgc --adapter=all

Adapter 0 - ATI Radeon HD 5800 Series
                            Core (MHz)    Memory (MHz)
           Current Clocks :    157           300
             Current Peak :    725           1000
  Configurable Peak Range : [550-775]     [900-1125]
                 GPU load :    0%
ERROR - Get clocks failed for Adapter 1 - ATI Radeon HD 5800 Series

poclbm only sees one card that it is able to use too. Both cards are seen correctly in lscpi:

01:00.0 VGA compatible controller: ATI Technologies Inc Cypress [Radeon HD 5800 Series]
01:00.1 Audio device: ATI Technologies Inc Cypress HDMI Audio [Radeon HD 5800 Series]
02:00.0 VGA compatible controller: ATI Technologies Inc Cypress [Radeon HD 5800 Series]
02:00.1 Audio device: ATI Technologies Inc Cypress HDMI Audio [Radeon HD 5800 Series]
At this point, I'm out of ideas. Any suggestions?

EDIT: Looking at Xorg.0.log I find the following:

[     8.579] (==) Using config file: "/etc/X11/xorg.conf"
[     9.590] (WW) fglrx: No matching Device section for instance (BusID PCI:0@2:0:0) found

Which seems like a likely culprit for the problem - though as far as I can can tell, I do have such a device section in my xorg.conf (linked above).
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