Quote from: gallery2000 on April 28, 2014, 05:57:33 PM

Quote from: pcfli on April 08, 2014, 10:01:40 PM

Quote from: trader59 on April 08, 2014, 04:56:30 PM

Quote from: firejuan on April 08, 2014, 05:44:32 AM

Assuming a static BTC value you maybe correct, but it was only a month ago that 1 BTC = ~$650 so it is extremely difficult to speculate on BTC value and mining.

I will gladly invest in your crystal ball that gives you the ultimate knowledge.

Quote from: trader59 on April 08, 2014, 12:39:32 AM

FYI, this is no longer profitable. It currently costs 6.4 BTC and at most you'll get back 5.5BTC with 17% difficulty increases. At most, you can hope to break even by selling the miner.

Jeez why is everyone so defensive? Just giving a heads up. All I'm saying is that if you were to invest money now, it would probably be much better spent buying BTC. You will end up with more BTC in the long run.

If you buy the miner, it would currently cost $2900 or around 6.4BTC. You will mine at most 5.5BTC and if you sell the miner, maybe you can get 1 more BTC. Maybe. It's a losing deal no matter how you look at it.

that is what the most of the people thinking currently, but i donot think so that the 17% increase on difficulty for 11 days will really happen by now, it is no reason, on one hand, you assume an very high increase ratio and on the other hand, you point out that wisdom people will not invest in miners. these two things are against each other naturally.
here is my roi analysis and i paste it here again
ROI analysis
Many people make decision whether the miner is worthy to buy on ROI analysis , and i will share my thought on it with you.
First, you need to consider the following two questions:
is the mining itself will disappear after six month?
What is the speed of the fastest miner can perform after six month and what is its price?

I will give you my answer to these question.
is the mining itself will disappear after six month?
The answer is definitely no, only the bitcoin exist, no reason that mining itself will disappear, and like most of the people in the forum, i have strong faith on bitcoin.

What is the speed of the fastest miner can perform after six month and what is its price?
I cant tell you the exactly number of that, but my answer is not exceed 2T with the electricity consumption of 1000 watt, during the last one year, with the appearance of ASIC, the hash rate speed you can gain with 1000 watt has increased from 6G to 1000G. But it is almost the best value we can achieve based on current technology. Although i am not an professional electrical engineer, i can see that the increase of the hash rate of the chips are closely connected with its manufacturing technology, which have been increased from 110nm to 28nm by now. But as i know, it is almost achieve the limit of current chip manufacturing technology also the limit of physical law. Although 20 nm manufacturing technology is possible but the cost will also increase rapid and may be not worth to use. So we can achieve the conclusion that the life time will more than 6 month.

Now we can go forward to the second question here, what is its price.
I cannt answer this question exactly also, but i does know that its price will not below its manufacturing cost. That is very simple to understand, the factory have no reason to sell them unless they can profit. As i know, the manufacturing cost for one dragon 1T miner will not below 1000$(chip, psu, Raspberry Pi, fans, shipment fee, all these thing need cost and will not disappear) .

Now we can go back to the ROI analysis, for most of the roi analysis, it will assume one miner will only have 2-3 month life, but based on above analysis, we can see that will not happen, so there is must something wrong with the current ROI analysis.

Here is my third question, what is the the most possible number(in %) of the adjustment of difficulty for one round (12 days) in Oct 2014?
I will give my answer later, but now, i want to hear your guys opinion

Hi Lee,

You said, "Now we can go forward to the second question here, what is its price.
I cannt answer this question exactly also, but i does know that its price will not below its manufacturing cost. That is very simple to understand, the factory have no reason to sell them unless they can profit. As i know, the manufacturing cost for one dragon 1T miner will not below 1000$(chip, psu, Raspberry Pi, fans, shipment fee, all these thing need cost and will not disappear) ."

but sponditech is coming out with miners that costs $850 for 1 TH

The SP30? Only if you buy 250 of them or get in on the group buy, plus thats a chip that hasn't been made yet. The cheapest you can get 3 for on their web site is $1295 for 1TH

I think that InnoSilicon know that to compete they will have to design a newer chip, I'm sure they are probably working on it already, the gauntlet has been thrown down by Spondoolies-tech and some other manufacturers, its up to Inno and others to see what they can come up with to compete. Its all good from a buyers perspective.