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Well, I have to admit that I'm currently waiting for the S4 specs and price be revealed. Although there is no valid point in investing in mining now with difficulty going through the roof (network hash rate has already spiked to above 260 PH/s, currently sitting at 250.5 PH/s) and BTC price in the cellar, I'm prepared to purchase my very first mining gear, because winter is coming and my plan is to let the miners assist in heating the house.
SP-T has really something going here, but unfortunately the long delivery times, high price and especially the high shipping costs speak against the purchase of a SP20 or SP35. Considering the total purchase price Bitmaintech offers a better $/GH rate, and although SP-T had a better W/GH rate so far, it may be beaten by a S4 with underclocked/undervolted ASICS.
$/GH and W/GH both have to be right, which is why those Tubes with W/GH way off can not even be considered.
I'm not giving up on SP-T, but something has to happen, because it's just not working that way. We need some innovation to bring W/GH below 0.5 and price + delivery times down, which may be impossible right now, but I have hopes for 2015.
SP-T has really something going here, but unfortunately the long delivery times, high price and especially the high shipping costs speak against the purchase of a SP20 or SP35. Considering the total purchase price Bitmaintech offers a better $/GH rate, and although SP-T had a better W/GH rate so far, it may be beaten by a S4 with underclocked/undervolted ASICS.
$/GH and W/GH both have to be right, which is why those Tubes with W/GH way off can not even be considered.
I'm not giving up on SP-T, but something has to happen, because it's just not working that way. We need some innovation to bring W/GH below 0.5 and price + delivery times down, which may be impossible right now, but I have hopes for 2015.
Let's assume a static network hash rate of 300 Ph/s, power costs of 0.1 USD/kWh and an exchange price of 500 USD/BTC.
SP20 costs 2.64 USD/day,
SP35 costs 8.4 USD/day,
S3+ B9 costs 0.86 USD/day, and
AM Tube costs 2.16 USD/day.
SP20 at 1700 Gh/s would mine 0.0204 BTC/day or 10.2 USD/day,
SP35 at 6000 Gh/s would mine 0.072 BTC/day or 36 USD/day,
S3+ B9 at 453 Gh/s would mine 0.005436 BTC/day or 2.72 USD/day, and
AM Tube at 800 Gh/s would mine 0.0096 BTC/day or 4.8 USD/day.
SP20 would make 7.56 USD/day profit,
SP35 would make 27.6 USD/day profit,
S3+ B9 would make 1.858 USD/day profit, and
AM Tube would make 2.64 USD/day profit.
SP20 costs 1,500 USD inc. PSU + shipping, it would take 199 days to break even,
SP35 costs 4,035 USD inc. PSU + shipping, it would take 147 days to break even,
S3+ B9 costs 320 USD inc. PSU + shipping, it would take 173 days to break even, and
AM Tube costs 500 USD inc. PSU + shipping, it would take 190 days to break even.
The network isn't static though and AM Tubes are the only miners in stock. I'll leave you to draw your own conclusions.
As I reply to this BTC = ~$396.80 .. so of course these numbers are off, could have been off if BTC was $1000 too, not talking about. What I see missing is the difficulty level factor in this. 147 days to pay back for example using the difficulty rate would be much longer. or am I wrong?
I made up a spreadsheet much like this, used it to compare all the miners I could find on Amazon, ebay and on. Pretty much the SP35 was the best in short time to break even as a single unit. Which is why I was drawn to this topic to start off. I wanted to gather more info.
Tubes was second. Plus easier to get with lower cost so they too hold an advantage. S3 fell in third on how I figure on the spreadsheet.
The poster who posted the 80/20 rule, many post back from this now, is right. Goes further too in forums as if this forum is anything but average, 80 percent noise to 20 percent useful info. Sorry if I spark further trolls ... it was that difficult to read and find useful info here on the SP35.
I don't want to sound negative either, like so many other posts here but it just seems the costs now are not going to pay back for much longer than a 147 days. Electricity cost are not a factor for me. Where my units would be placed I do not pay for the engery, nor the heat/cooling. All part of the lease. I either use it or not. I would get the best bang for my lease if I did. Problem is there is amount to use, that is limited current wise. I would only be able to place in 4 SP35s as is. Then I would have to run additional capacity into the room.
I had mention that these units would be shut down when a lower noise level was desired. Right now, that would be less than 20 hours a week. A drop in the bucket. The room is not that much used.
I am looking at other alt coins for mining and dropping BTC mining. Depends on the answers to this post.
Please don't respond to this post with further trolling. Just looking for some clarifications.
Dale
