Topic: The completely evaluation of Dragon 1 T bitcoin miner from china - page 4. (Read 45703 times)

OK thank you, I appreciate your response!  I will look him up.

sorry for the confusing, i guess i didnot get your point here. to be honest, i am not an engineer and know a lot on this issue, you can ask bobsag3 for help, he seems know a lot and he buy a lot of miner

I already have my own hardware, and the noise isn't that bad.  I was just curious if I could put in a high powered fan that isn't quite as loud and would do the same job.  I have searched everywhere even looked up the brand of the fan inside the machine but can't find the stats on how much airflow it puts out.  I grabbed a few 130cfm and that is pretty powerful... the most powerful I have seen anywhere online is 200cfm.  So I am guessing you don't know what airflow these have stock?

if you want to get rid of this trouble, you would better buy one host miner:)
as i know the temperature will effect the hash rate, you would better not to replace it with a quiet fan, because the summer is coming

Lets get back to my question because it was so riveting!!  Any ideas on the fan speed for the Dragon 1T?  Anyone ever replaced the fans?  I have a smaller space and these suckers are pretty loud. 

You may be right here.  But I have to say that over the past 8 months I have received about 44 miners, Antiminer S1 size and larger, directly from China.  I have never had one seized or even delayed by customs.  I'm in the USA.  I have had one come in with blades loose.  But it was easily fixed and the rest were all ready to plug and play.
I don't know the FCC rules on what is allowed and what is not.  I could be the luckiest guy in bitcoin for having them all delivered.  But I have not heard of anyone getting these seized by the FCC or Customs or anyone.  Jus sayin'.

I have only ordered one Dragon so far.  It made it very fast.   No customs problems or destroyed.  I was very satisfied.

Got it destroyed once.
[/quote]

There is my point... 3000$ is a very big gamble for this machine. Hosted mining adds even more cost so I think this is not interesting either, as this machine does not ROI as it is already so hosted adds even more cost.

This FCC issue is a real tough one; it is annoying because FCC compliance wasn't really meant for these networked miners but it becomes a tough bureaucratic problem.

The manufacturers in China will have to become certified, I guess there is no other way around it...
[/quote]
i provide an insurance for the people who worry about ROI thing
Insurance for the host miner
To ensure the people who buy host miner in my place will not lost money, we provide the following insurance
All of the host miner will have an option to resell after four month host and the price is calculated based on the following equation:
　　　　　　　　　　　　　　　　R= I+H*4-M*E
R:   Re-sell price
I：  Initial price of host miner
H:   Host fee:225$
M:   Mined btc during the four month,
E:   Exchange ratio of btc/usd from btc-e

Here is an example for understanding:
A buyer who have bought one host miner at the price of 2900$(I), the miner switched to his/her pool on Apr 18, and host in my place for four months, and mined 6.035 btc during these time. And the real-time exchange ratio of btc/usd in btc-e on 18 Aug is 410$ . Then this buyer will have an option to re-sell the miner to us at the price of
R= I+H*4-M*E=2900+225*4-6.035*410=3800-2475=1325$
[/quote]

Flawed, flawed, flawed. 1 TH/s is not going to mine 6 BTC in four months. No way. No where near.

And what can I say about that formula?

R=I+H*4-M*E

WTF

is that

R = (I + (H*4)) - (M*E)

or

R = ((I+H) * 4) - (M * E)

or

R = (I + H) * (4 - ( M * E))

FFS - you can put any number you like into that formula and make a profit.



[/quote]



R= I+H*4-M*E


Know the order of operation --- the universal math language.

So you do multiplication and division first before you do subtraction or addition.

There's nothing wrong with the formula R= I+H*4-M*E

Hello pcfli... thanks for all your help on this thread, very appreciative.  I own two of these beasts, and I love them... I was just wondering if I could put in some fans that were a bit quieter.  I have some 120mm fans that can push 130cfm of air, but I can't find the specs on the fans that are already installed.  I don't want to put a weaker fan in there and overheat the system, and would actually like to improve the cooling because they run around 55-60c right now.  Do you know the specs of the installed fans and can they be upgraded?

Then if the first formula is correct and I only manage to mine 2 BTC in four months, my re-sale value goes up - doesn't compute...

thanks for the point out, the first fomula is correct, and i will update it

Flawed, flawed, flawed. 1 TH/s is not going to mine 6 BTC in four months. No way. No where near.

And what can I say about that formula?

R=I+H*4-M*E

WTF

is that

R = (I + (H*4)) - (M*E)

or

R = ((I+H) * 4) - (M * E)

or

R = (I + H) * (4 - ( M * E))

FFS - you can put any number you like into that formula and make a profit.

i provide an insurance for the people who worry about ROI thing
Insurance for the host miner
To ensure the people who buy host miner in my place will not lost money, we provide the following insurance
All of the host miner will have an option to resell after four month host and the price is calculated based on the following equation:
　　　　　　　　　　　　　　　　R= I+H*4-M*E
R:   Re-sell price
I：  Initial price of host miner
H:   Host fee:225$
M:   Mined btc during the four month,
E:   Exchange ratio of btc/usd from btc-e

Here is an example for understanding:
A buyer who have bought one host miner at the price of 2900$(I), the miner switched to his/her pool on Apr 18, and host in my place for four months, and mined 6.035 btc during these time. And the real-time exchange ratio of btc/usd in btc-e on 18 Aug is 410$ . Then this buyer will have an option to re-sell the miner to us at the price of
R= I+(H*4)-(M*E)=2900+225*4-6.035*410=3800-2475=1325$

There is my point... 3000$ is a very big gamble for this machine. Hosted mining adds even more cost so I think this is not interesting either, as this machine does not ROI as it is already so hosted adds even more cost.

This FCC issue is a real tough one; it is annoying because FCC compliance wasn't really meant for these networked miners but it becomes a serious bureaucratic red tape problem.

The manufacturers in China will have to become certified, I guess there is no other way around it...

Got it destroyed once.

if you worry about this, i recommend you  buy a host miner , then such thing will never happen.
you can check the detail of how to buy a host miner through the following link https://bitcointalk.org/index.php?topic=576844.0;topicseen

are you talking about decompiling the binary?  If so, have you ever tried doing that?  It's not trivial.

Guys I know this is an annoying question, but if I import this Dragon Miner to the US don't I risk seeing it get seized then destroyed at customs for non FCC compliance?

All computers or electronic devices in the US are subject the FCC compliance, and manufacturer/shipper must provide proper documentation at customs on request.

That's a risk I wouldn't want to take; please prove me I'm wrong, guys...

actually i do but i know theres more than one way to skin this cat..

He probably doesn't understand the difference between "source" and "executable/binary"