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1  Economy / Computer hardware / For Sale: NEW Scrypt Asic MAT 5 Excalibur 250Mhs on: January 24, 2015, 05:53:09 PM
* Update: Item is now live on Ebay listed here

Hi all.

I purchased two brand new MAT 5 Excalibur 256Mhs miners and looking to sell one of them. I got a good deal for both, but only really want to run one of them.

I will be listing this on Ebay in a couple of days time, just waiting to be an approved seller. However I don't mind using a trustworthy Escrow service.

Item will be well packaged and an instruction manual will be provided. Unit has been fully tested to be working.

These units are exactly the same as the alchemist 256Mhs units listed here, that are selling for $3,099 each.

PM me if interested and I will send you a link to the Ebay listing. Will be looking for around 1,400 / $2,098 + postage. I will cover costs for Escrow.

Any questions feel free to ask.


2  Economy / Economics / Attempt to find current value of btc on: June 17, 2011, 01:17:52 PM
I wanted to open up some discussion on determining the true value of a bitcoin. Rather than just taking a stab in the dark guess at what we want or think it should be, I propose we try to justify a true value. Of course this will be changing as time goes on.

I will kick it off and try to show methods to find a value, please jump in and tell me what I am missing or should include...
My thinking and assumptions are based on limited experience with the bitcoin market, and I dont have the time or wish to study it in-depth at the moment...


Ok first we need to know who the market participators are:

As far as I can tell we have:

  • Miners
  • Day Traders
  • Investors
  • Manipulators (mtgox, bitcoin owners)
  • Illegitamate traders (money launderers, drug dealers)


Now we should try to see what price each participator wants from bitcoin.

The miners (significant) have invested a lot of up-front money to buy equipment. They are also paying running costs and will have some down time. So we need to find the current average cost to generate 1 bitcoin. (I am hoping some more informed members can jump in and help with some figures).
Then lets say that because of the uncertainty of bitcoin atm, miners are probably looking to pay off their original outlay in say 2 months.
Then we should take into consideration future difficulty increases withing this 2 month period and the affect this will have on the cost of generating a single bitcoin.
Put all this together and this will give us a base figure for what they would need bitcoin to sell at in usd.

Now miners will have a considerable affect on the price, since if the current price is less than this base figure, they will most likely not sell and hold onto their bitcoins. This will push price higher as there is reduced supply. So if we can get as accurate as possible on the miners than we can have some idea of where price is heading.

This process need to be done for each participator to give even more bias towards a direction and price.

I will come back to this if there is some interest in what I am trying to do here, but hopefully it has given a platform to take this further.
3  Bitcoin / Development & Technical Discussion / Using Xbox to Mine? on: June 11, 2011, 08:26:36 PM
I wondered if it would be possible and worthwhile to try and mine using xbox or any other console? Probably a stupid question and something someone else would have thought about before but you never know..
4  Bitcoin / Bitcoin Technical Support / Setting RPC Miner for second GPU on: June 09, 2011, 07:24:19 PM
Hi, earlier today I had great help from someoneweird. I had to use the RPC miner to run my gefore GT240 ..

Now I have installed a second GPU I had lying around it is GS8400.

It is installed correctly and RPC has found both devices, however RPC says that it is using the first found GPU, which is the GT240. I wondered how I could get it to use the second GPU instead, and/or if possible use both?..

well I guess to use both just have two seperate .bat files one pointing to the first gpu and second to run the second...
5  Bitcoin / Bitcoin Technical Support / Difficulty Installing - Noob on: June 09, 2011, 07:40:00 AM
Hi, I have gone through the very thorough installation guides to joining the pool and getting the rig set up.

I feel I am almost there but I have a problem:

I am able to run the bitcoin server client correctly.
I have the poclbm files extracted and put into a new folder within the directory of bitcoin folder.
I have created the .bat file to run the poclbm pool thing and used my correct username and password to connect with the server, all is set up correctly at the website as well.

However, when I try to run this the screen just flashes up and goes away instantly. It does not appear to be the command prompt because it is a white screen, at least I think so.
I have read about this could be an issue with the driver and not having OpenCL installed corectly....

So I downloaded the GPU caps viewer, which indicates OpenCL is installed.
Also I have just updated my driver for the GPU I have. But still this problem happens.

My system is:

windows 7 64bit,
GPU Nvidia GT240
Intel i5 3.20Ghz

There was at one point an issue with a file being missing, that was the poclbm.py file, but I have since installed that from gimphub. Now it has this screen flash up...

I suspect that it could be a driver issue with my GPU, but I am not sure what to do next.
I have also tried to change the driver=0 to driver=1 in the .bat file.

Any help appreciated..
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