Germany. I opted for real green power, not some green labeled nuclear power, which is quite expensive unfortunately. And we have high taxes on power, so the industry can pay low taxes on power - hooray!
For mining one probably should go for 100% nucular, but that's not my way.

Yesterday I made myself the trouble and created a fancy excel document to check the sweet spot of my 2 module CCD and to know in detail, how fucked I actually am.
My coindesk has two modules, of which one is fine and one is quite picky, limiting over and underclocking. There is currently no way to have different settings for the different modules, to get the most out of the wreck that would have been a decent miner months ago. So the weakest module is the limiting factor.

I'll make this short:

Settings 1

Bitcoin Price	330 €/BC
Starting diff.	8,000,872,136
Days to next change	2.1
Avg. minutes per block	9.8 (*)
Avg. est. diff change	15%
Power cost	0.3 €/KWh

(*) 10 is targeted, but on average almost always lower than that.

Miner settings

Clock	890 Mhz
Voltage	850 mV
Bus speed	6000 kpbs
Avg. hashrate brutto	452,000 MHs
Avg. Power	470 Watt
Watt/GHs	1.0398

Using these settings and assumptions, I can run the miner for 7 diff changes, including the next one in 2.1 days. The estimated day of that final change is 03.08.2014 - starting on 16.08.2014 it will mine at a loss.
There is no matter what, it can not mine any longer than that, because I already tweaked it to almost 1 Watt / GHs and it is impossible to push it lower than that due to the faulty module - at some point it will simply turn off or produce way more HW errors than accepted shares. Anything that is still possible in terms of efficiency with this miner does not make any difference. 16.08.2014 is the estimated day it will go red.

Until then it will, given 100% uptime (the miner sometimes simply stops to mine) and the variables printed above, it will mine me 251,01 Euros.
The miner did cost me roundabout 1100 Euros.

Profit - power included

Maximum mined profit		251.01 Euro *
Investment	-	1100.00 Euro
Netto	=	-848.99 Euro

* 1.74840244 BC @ 330 Euros - 1114 KWh * 0.3 €


This does not include:

• Loss of money due to difficulty being MUCH lower when the miner should have been delivered. This sums up to a couple thousand of Euros, but I won't do the math here, too depressive.
• Loss of money due to much higher bitcoin price in the past, which leverages the loss.

More downsides:

• I understood that a Desktop unit is something you can have at home and you go for a Rig if you have a cellar, data warehouse or something where the miner is not around you. The miner is loud as hell, I have to put it in it's own room with the door shut and I don't know what my neighbours will say about it.
• There is pretty much no room for more cooling. There are already 2 jet engines in this unit. I might get some fans that are even faster, but that would make it even louder as it already is.
• It will heat up a 15m² room pretty quick. Not really a surprise, but I wanted to point out that you really need some fresh air where you put the miner.
• They sent me the unit right before they needed to add another compensation module. They took full advantage of the fact that on a 200GH CCD, one additional module compensates for up to 100 days of late delivery. On top of keeping their 25% performance increase by themselves by reducing chips per board. On top of underperforming. On top of difficulty increase by factor 7 since original date of delivery.

On the upside:

• I have another Rpi now and some more cables
• The case itself is nice, I can put it to some use
• Free 1KW power supply (way too oversized for the 620 Watt max. draw I can push my desk to, way too small for anything with 4 or more modules).

If you are one of the many who have not received their miner yet: CANCEL NOW. Without the Bitcoin skyrocketing - which is a pure gamble to rely on - there is no way to get a ROI.
Do it in a proper way to prevent further headaches: https://bitcointalk.org/index.php?topic=486808.msg5410362#msg5410362.

Man, what a depressive journey this has been.

WxHxD: 39x17x41 - depth without power cable

Weight I don't know, don't have a scale here. On the package they say 20kg, but I guess that's not the real weight.
Something between 10 and 20kgs I'd say with two modules.

Hello Zefir,

thank you for your response and sharing what you have learned!
I was talking about a CCD200/400, yes. I'm more the software guy so I figured creating my own board, which I very wanted to do, would not make sense at all. Too much to learn from scratch and not enough time to do so. :|

I've followed your thread and posts over the last months and read that you we're trying to create such an autotune tool on your own, but more low level than I'm trying right now. As far as I remember you wanted to tune the chips individually, which would get the most out of them. I cannot do that at all, so I try to tune the individual boards inside the CCD instead, which should be easier and still would be better than nothing.
For that I though about using some existing high-level software to set a clock speed and voltage, let it hash for X minutes and evaluate the shares/stales/hw errors - and watch the temperature of course. With that, go through a list of clock speeds and voltage combinations to check where I get the best share/error/power consumption. I already did this manually to some degree, but it is very time consuming, so I wanted to automate that.

The basic idea was to use cgminer to set those settings to the CCD modules individually, in my CCD400 there are two of them.
As far as I can see, I can only set 1 clock and 1 voltage settings for the whole CCD, but I'd need to set those individually for the two modules, as they behave different - one generally needs more voltage than the other to not produce too much HW errors with the same clockspeed. Right now I have to use the conservative settings that make the "bad" module run at an acceptable performance, but it wastes potential on my second module, which could do much more.

But this is only possible if I can set the voltage and clock speed individually for each board in a CCD, using cgminer, which I think is not possible right now? Or maybe it's even not possible by design?
I tried to have a look at the A1* files in git, but I don't understand a thing of the low level stuff being done there.

Hello Zefir,

Sorry if this thread is inappropriate, but this is the only place I have found to discuss technical stuff about coincraft.
I have a question about the coincraft cgminer implementation, that maybe you can answer me:

Can you set different clocks and voltages for each module within a coindesk with cgminer?
I have one module that is quite prone to errors and one module I can push quite hard. Right now I have to use the settings of the bad module for both, which wastes a lot of power, which again, given the bitmine circumstances, really hurts. :|

Also, did you manage to get the temperature readings working in cgminer somehow?

If both are possible, I'm thinking about creating a little autotune tool do automaticaly determine the best settings for the modules in terms of efficiency. This requires me to read accurate temperature data of each of the modules and to be able to set the settings for each module individualy.
I could do it more low level, but that doesn't pay of for the 400GH/s I own anymore in any way, so I'd like to go with something "easy" to implement.

Thank you and best!
mork

Not sure about my PSU but with two modules I get to 520 Watts on 950 Mhz @ 860mv (I think), which produces a lot of hardware errors on one module already ( the second module seems to be tougher, anyone know if I can set two different voltages/clocks?)

So for you this would add up to 1040 Watt for these settings, which are not the highest ones available. I assume that this is too much for the PSU.

The coindesk seems to be prepared for open wireless networks out of the box, but my network is encrypted with WPA2-Personal/AES.
This does not work out of the box (or I'm really really stupid ), as it requires the wpa_supplicant binary which is not included. I found no package manager installed to install the binary and I also have not found a binary on the web, so I needed to cross compile it.
To save anyone the hassle to do the same, I provide you with my compiled binary. I also cross-compiled the wlan-tools, which are helpful in checking if your wlan adapter works and to scan networks + get details about their settings.

This is a condensed how-to, you might run into trouble somewhere and if you do, you need to know or find out how to solve it.
I cannot give support for this, there are just too many things that can go wrong (in terms of: wlan not working).

Note:
As I have compiled the provided binaries from source, in theory I could have manipulated the source to do evil things with your miner.
I guarantee that I did not, but I think that you should be aware of that such things are possible.

Note2:
I cannot be held responsible for any damage caused by my instructions or the files provided. It is extremely unlikely that any damage gets caused and nothing should void your warranty as this is nothing but moving a couple of binaries on the miner and reconfiguring the network, but be careful nonetheless. If at any time you happen to f**k the OS of the miner up to no rescue, which again is unlikely if you follow my steps, you can get a new sd-card flash file at bitmines website, so you should be somewhat safe.

---

Prerequisites

a) Mandatory

• wpa_supplicant binary (provided in package)
• access to a linux box with wpa_passphrase binary
• working wifi card/usb-plug.
• DHCP Server

b) Optional

• wlan-tools (provided in package)

c) Known issues

• The front display will not display the IP anymore. (fixed, see bottom)
• There is an error message when starting wpa_supplicant, but it works anyway.
• I was yet unable to compile wpa_passphrase, therefore you unfortunately need access to a linux box that has it to create your PSK key
• You can't use wget to fetch the package from mega. You need to download it and move it to your coindesk using scp (in linux terminal: scp coindesk-wlan-package-1.0.tar.gz root@IP-OF-YOUR-MINER:/home/root) (on windows use WinSCP)

---

Cross compiled binaries

coindesk-wlan-package-1.0.tar.gz at (1,5 MB, @mega)

Includes:

• wpa_supplicant binary
• wlan-tools binary + 1 library file
• init-wlan script for if-pre-up to start wpa_supplicant on ifup

Binaries compiled using:

• arm-bcm2708-linux-gnueabi-cc
• arm-bcm2708-linux-gnueabi-gcc

See at the bottom: "Helpful ressources - 4. Setup cross compiler for raspberry on linux" to get a starting point to compile everything on your own. Good luck.

---

Optional step - wlan-tools:

1. Unzip package:

root@raspberrypi:~# tar xvzf coindesk-wlan-package-1.0.tar.gz

2. Change to new dir

root@raspberrypi:~# cd package

3. copy library to /usr/lib

root@raspberrypi:~# cp libiw.so.29 /usr/lib

4. copy binaries to /usr/bin

root@raspberrypi:~# cp iw* /usr/bin

See "1. Quick overview on wifi-tools:" at the bottom for some basic info about the binaries.
The most interesting would probably be:
root@raspberrypi:~# iwlist scan
root@raspberrypi:~# iwconfig

---

Steps - connecting with WPA2 auth:

1. Unzip package:

root@raspberrypi:~# tar xvzf coindesk-wlan-package-1.0.tar.gz

2. Change to new dir

root@raspberrypi:~# cd package

3. Copy wpa_supplicant to /usr/bin

root@raspberrypi:~# cp wpa_supplicant /usr/bin

4. Make sure it's executeable:

root@raspberrypi:~# chmod +x /usr/bin/wpa_supplicant

5. Configure /etc/network/interfaces

root@raspberrypi:~# vi /etc/network/interfaces

(press insert to toggle between read, insert, replace mode. mode is displayed in bottom left (none, "I", "R")
(when in read mode, write :q to exit, :wq to write and exit, :q! to exit without saving changes)

There should be a wlan section at the top already. Change it to this:

Replace YOUR_NETWORK_SSID with the SSID of your wireless network.
Save changes and close editor.

6. Create your PSK key

Get to a linux box with installed wpa_supplicant and run:
user@boxwithwpa:~# wpa_passphrase YOUR_NETWORK_SSID YOUR_NETWORK_PASSWORD

It should output something like this:
Copy the long string after psk=

7. Create /etc/wpa_supplicant.conf

root@raspberrypi:~# vi /etc/wpa_supplicant.conf

Insert this:

Replace the stuff in UPPERCASE.
This is for WPA2/Personal with AES. If you have a different setting (check with wlan-tools: iwlist scan), you need to modify this. Check at the bottom "Helpful ressources - 2. Different configuration settings for different encryptions" to get an idea about the different settings.

---

At this point you should be able to log in to your network and receive an IP with these steps:

1. shut down wlan0:
root@raspberrypi:~# ifconfig wlan0 down

2. start wpa_supplicant:
root@raspberrypi:~# wpa_supplicant -B -i wlan0 -D wext -c /etc/wpa_supplicant.conf

(It will throw an warning/error about ioctl, don't care...)

3. start up wlan0:
root@raspberrypi:~# ifup wlan0

udhcpc should start discovering your network, it then should receive an IP and you're in.
Verify with:

root@raspberrypi:~# ifconfig

There should be a wlan0 interface that has an IP.

---

For me this was not enought to make it start up on boot, I needed to add a if-pre-up script to make sure wpa_supplicant is up and running before udhcpc starts to fetch an IP.
Copy the script provided in the package to /etc/network/if-pre-up.d/:

root@raspberrypi:~# cp init-wlan /etc/network/if-pre-up.d/

Make sure it's executable:

root@raspberrypi:~# chmod +x /etc/network/if-pre-up.d/init-wlan

Leave the cable in, do a reboot and check with ifconfig if the wlan0 interface has started up and if it has an IP.
If it does, write down the wlan0 IP, remove the cable, reboot and you're clear to go.

---

Helpful ressources:

1. Quick overview on wifi-tools:
https://rasspberrypi.wordpress.com/2012/09/09/wifi-tools-for-raspberry-pi/

2. Different configuration settings for different encryptions:
http://ubuntuforums.org/showthread.php?t=318539
Note: Scroll down, there are multiple sections for various encryption types. Of interest are these lines:
To use the settings, remove the "wpa-" part and copy it to/replace it in your /etc/wpa_supplicant.conf.

3. Explanation of wpa_supplicant (German)
http://wiki.ubuntuusers.de/WLAN/wpa_supplicant

4. Setup cross compiler for raspberry on linux
http://stackoverflow.com/questions/19162072/installing-raspberry-pi-cross-compiler/19269715#19269715

---

Updates

Fix display of IP

Backup minerosd.py, just in case.
root@raspberrypi:~# cp /mineros/minerosd.py /mineros/minerosd.py.bck

Edit minerosd.py:
root@raspberrypi:~# vi /mineros/minerosd.py

Change this:

to this:

If you're feeling fancy and know python, you could modify this part to first check for ethernet and then fall back to wireless.
Don't touch the rest. Save, exit, reboot.

---

Please let me know if this was helpful for you.
And just in case that you're feeling generous: 1KZa4QediT8TUx5vF4UXzuJhqWPYAhd3P9

Good luck!

Have received my miner.
I waited too long to cancel my order and, as expected, a few days before they would have been required to add a second compensation module to my 200GH/s unit, they sent it out. No comment.

The box is loud as my vacuum cleaner and I'm trying for hours to get wifi up and running to move the box out of my living room.
Could have been a cool device, if, yeah if somewhat delivered in time and without all that shady acting of bitmine.

Delivery was due for end of december. It's may now...
Got the notification from bitmine on 24.04, delivery was on 30.04. And Fedex is just stupid, device was lying around for days because they thought "it's not yet due for delivery". One of them were very unfriendly at the phone as well.

You is a really funny man.

I haven't followed the conversation for a few weeks now, since I got enough of the "two weeks" tales from that mafioso. He utterly fucked up the whole story and there is still not the smallest glimpse of that they are actually even trying to improve or pull things straight. After almost half a year! LOL, they are even still working on the rigs and now there's again something missing. AGAIN? Come on!? And where is my desk? I should have received it last year! How about ANY freakin' information about my status? That's customer service, hell yeah!

As someone who is close to his 5th month of delay I tell you that I personally don't fucking care about anyone being polite anymore. Giorgio and his gang had way more than enough chances to pull things straight. He has not and he's not even trying yet.

Blaming people who are fed up by this whole story by now, after all the bullshit and lies we went through the last months, after all those chinese companies popping up with clones and actually delivering and doing so at a cheaper price, you sir are very funny in a special way.

For me the story is over now. I'll do the paperwork for refund this weekend and if they don't comply by the rules they have agreed on, which I expect, I'll sue them. This costs me time and money I could spend on better things, but, you know, I don't care anymore. They don't care for me as a customer, why should I care for them?

Yeah sure, probably in "two weeks™"...
Just be very nice and kind to Mr. Giorgio and don't try to hurt his emotions and his psyche. Maaaybe you might get an update then. Some day. Probably in two weeks. Bollocks!


Sorry for getting personal, but I really can't believe that there are people still defending this scam. It really puts me off on top of all what has happened already. You might have your reasons...

December delivery still not delivered. Have not heard a single word of them. Will come back in "two weeks™".
Nah, will cancel now because enough is simply enough.
And next time I'll check which part of Switzerland we're talking about for sure. :p

Still waiting for my miner, still pissed.

Meanwhile that clown is heavily annoying me, so I made myself a small Greasemonkey script to remove his (and potentially others) posts from the threads I'm reading. If someone is interested: http://pastebin.com/04ZGEsqN
Much better know. ;p

My position is, that there was and is nothing to misunderstood.
If they apply their TOS by the words, we can do the same. Not what we interpret into it is what counts, but what the words do say.
And they say: 10% for every 10 days of delayed delivery. No limits on that whatsoever.

Bitmine can now think "oh fuck, we didn't think we would be THAT late and we need to limit the CPP". They can try and see if people accept it, but in the end, when things go to court, they will lose with enforcing new rules on a sale made in the past.

Note:
I'm not to profit of this at all. I have ordered a 200MH/s unit and they can and probably will wait for the full 100 days to deliver the device to me, because it is not until then that they need to add a second CPP module to my order. Just expecting the worst.


@Finnminer:
Well, I am not enforced to request that refund. I can claim that they fullfill the contract I have with them. Whatever is a better deal for me, receiving the unit or go for refund, is up to me alone and not for you to decide. Thank you.
And no, I'm not getting rich nor was I expecting to get, but I expected the miner to mine for its cost. Which is already impossible at this time, given my power costs, taxes and that they will probably put the CPP module on the bill, where I have to pay additional taxes. I'm already at a hefty loss and we're getting close to the day when the moment I power on the device I have yet to receive, it will mine on a loss. I'll initiate the refund very soon and I will do it based on the old conditions. If Bitmine thinks they don't need to accept my refund based on the old conditions, I'll go to court - simply because they really pissed me off multiple times by now and that is not the way you do business with me!

I had very pessimistic estimations, but it was clear right from the beginning, that if Bitmine fucks up and delivery is not until March, this thing is gonna cost me. You tell me if I was optimistic with receiving the miner in February latest, which should have been delivered in December

I was just reading their TOS again, to check for that 50% cap. Because, maybe I'm stupid but, if they change it after my purchase, those changes do not apply for me at all. And for you too...

And look there, §4.5.2:
50% cap my a**...

Something interesting I found out:
TOS - §1.6 reads:
That actually means:
Since Bitmine does NOT send out that confirmation on its own as stated in the TOS, if you have not requested the confirmation on your own and have received it, they can claim you never had a contract with them, if they want to.

Please note: As long as you do not sign that refund form - specifically anything with new terms on it - the original terms of sale should apply for your refund. No clue what were the details about payments in bitcoin, but whatever is written in the TOS at the time of your purchase should apply. No more, no less.

I payed with fiat, so in my case I get the full amount + 10%, no deductions or whatever. Because those were the conditions upon which I made business with Bitmine. No matter what they're saying now, as long as I don't agree to it. Nice try though and really speaks for itself.

A couple of posts earlier someone suggested how to do it when requesting a refund in bitcoins. Might be a start...

First, please don't get me wrong, I respect you Zefir for what you have done for the community in this bitmine case. I appreciate it, really.
But I have to respond on some of the things you say and I try to do it in a polite way.

My suggestion would be to actually provide official and regular communication in the first place.
There are always people who will complain no matter what, but Bitmine did everything to make customers, who normally don't complain that fast, to have very good reasons to complain. If you don't interfere, things might and did get emotional for some, hence the flames and personal attacks I really don't agree to.

Bitmine prefered to have everyone call and write them each and every day for them to get status updates, instead of providing information on their official channel, opening the gates for tons of FUD and making people angry due to their very poor business practice.

After all these months, do they send out the payment confirmation along with the queue # yet, as promised when ordering? My bet: No. Just an example and it only gets worse from there on.

See, I'm a calm person and it usually takes a lot to make me get angry, but in this specific case, Bitmine did everything to achieve this and very few to prevent it. This is business after all and I expect some basic level of professionalism. Sorry for that.

I'd prefer to get the facts of the source at first, not some random stranger from the internet.

Right now I'd actually be glad to get even 100% ROI, which I won't cause unfortunately I have to pay for the power the miner will use, which is expensive in Germany.
Then, a lot of people are not in the position to request refund yet. So no wonder there are only a few or no refunds - yet. Not even talking about bitmine trying to enforce new terms for the refund.


Again, thank you for all your efforts and for still taking the time to communicate. I wish whole Bitmine would act like you, but they don't and there's no light at the end of the tunnel yet.
To the others, please calm down a bit.

Best
Mork

I'm no lawyer at all, but my common sense tells me:

DO NOT SIGN THIS!

Instead, take the first page, fill it out and at the end of the page, put your place + date + your signature.
Throw the second page away.

Then make sure, you can 100% proof that you have a confirmation, that they have received your letter.
3 methods come to my mind:

1. Fax. Be careful though, you need the sending confirmation you receive after sending and on that confirmation there should be a copy of what you have actually sent.
2. Registered mail, where they have to sign that they have received your letter and where you get the written confirmation back.
3. Not sure if this is possible in Switzerland, but in Germany you can go to a court and have them delivering your letter in person. This costs a small fee, but it's the strongest evidence you can get, that they have received the letter.

If and when you put the letter in an envelope, get someone who watches you while doing it.
Also, when sending the letter, also have someone with you.
Otherwise they could argue, that what you have sent them was not the refund request.

If they don't comply to your request, because of the missing second page, you'd probably need a lawyer who will open Bitmine's eyes on what is legal and what is not.

Again, I'm no lawyer, I cannot say 100% for sure if they are allowed to force you into new terms to receive your refund, which conditions where originally defined in their TOS at the time you bought the miner. In my oppinion they cannot. If in doubt, please contact a lawyer before you sign anything!

Edit:
Thinking about it, they cannot refuse your refund at all, if you do not sign the second page. Why? Because as long as you do not agree to their new terms on the second page, the original TOS applies, which says:

These are the rules that do apply. Nothing more, nothing less. Don't agree to new rules by signing the second page. My advise.

Zur Abwechslung mal keine Bitcoin-Untergangsnachrichten:

http://www.golem.de/news/virtuelle-waehrung-im-alltag-koofen-im-kiez-mit-bitcoin-1402-104661.html

WTF?

I understand that some people were not acting/talking in a nice way in the other thread.
But I can also 100% understand why they did. I feel like they do, yet did not raise my voice too often, yet.

I'm utterly pissed right now. I stated earlier how Mr. Massa could easily have prevented the shitstorm that rains upon him. What I have proposed is an absolute standard when doing business.
Instead he freely decided to go the path he did and fucked up each and every person involved in this drama.
Then he decides that he can't stand the reactions he himself has caused and closes the official thread?
Seriously: UMAD?!!!

@Biffa: You're ignoring the fact that the smallest module size is 200GH/s, 100GH/s to match your example.
So while in the first example you get 1100 GH/s, in the second you'd get 2000GH/s ( 10 x 2 x 100 ). You might agree that there is a difference.

Seriously. If they start to pull things off like joining separate orders, where I'm pretty sure this is not legit, I'm starting to get angry as well.
Then I pretty much can assume that I'll never receive my 200GH/s miner, as it'd be cheaper to refund me than adding another module to my order.
We'll see...

Risks are one thing, bad communication in a multi-thousand dollar business another one.

When you invest money of that scale with someone, you might expect some basic level of professionalism.
Most of the time, when something is indeed communicated, you can quickly add 1+1 together to know that things just don't/can't add up. It is bad to give someone that impression in a business relationship.
It's odd to get most of the information of customers or other business partners, who thankfully share their information about their private communication with Bitmine here on the forums. It should be Bitmine who is communicating these informations in the first place. They would get much less mails and phone calls that way, as well, so more time for building the miner and posting on the forums.

Well, everyone should have figured by now, that the three weeks delay is not going to happen (which was pretty obvious already, when the delay was announced. It was the best case scenario IMHO). It will be more, shipping is not going to happen till midst of february earliest - if we're not affected by chinese new year, that is (if we are, add another 4-6 weeks).

I'm really looking forward for my miner, though my (pessimistic) calculations have already been completely messed up by the now expected delay and it's questionable if I will get somewhere near ROI, where there was a good chance to make a profit on it, initially. Well, that was the risk I have taken. The miner is real, at least, so that is the most important thing. But very next to it is, to receive it as soon as possible and to get informed about progress and delays, so one can act accordingly - e.g. by doing some additional investments.

The only thing I ask of is a regular and truthful update, to know where we are standing at. With that, I prefer a pessimistic estimation over an optimistic one.
I shouldn't be impossible to drop to the forum once a week at least and give us a short update, no matter where you are. If there are delays, that's the way it is, but please tell us about it as soon as you know it. If there's good news, please tell us about it. If there is no news at all, which is unlikely, please tell us about it.

Again, I am grateful that someone is building that miner for me, as I'm more the software guy than the hardware one. I appreciate their efforts and I think their miner will be a good one. But they really need to improve on their communication, which lacked from the very beginning.

Thank you
Mork.