Topic: Block Erupter Prisma (>=1.4 T/device, 0.75-0.78 W/G, <1 BTC/T, October Shipping) - page 35. (Read 108056 times)

All of the highlighted statements are false. The conditions aren't static and there is no immediate mining start. Instead of throwing with useless and fictional numbers like $1,764 USD  why not use your energy for some realistic projections. By the time the Prisma miners will ship difficulty will jump 2 times. The next jump is in just 3 days and it's projected to ~19%. For the sake of the argument let's say the next one will be ~15%. That means that the $1,764 will transform to a merely $1,200 USD. 

I hope that everyone else notices jimmothy's and your biased projections as AM shareholders!


Sure. Under static conditions (since you like to use it) 2xSP35 will not overtake Prisma in monthly mining profits, but it will be the same as 10xAM Prisma miners. The 2xSP35 owner will pay less for them and start mining one month later. The 10xAM Prisma owner will start mining 1 month earlier, but in that one month of head start he will only regain the difference of price compared to the 2xSP35 miners (~1200$). After the first month both solutions will have the same profit per month, except that the AM Prisma owner will need a bigger electricity circuit than the SP35 owner.

As for your 0.1 BTC I will reply you in the dedicated thread, no need to be so desperate.

I think you're the one playing dumb.

Why would you automatically assume everyone needs to pay ridiculous import tax even though the majority of people mining don't?

Also not everyone is forced to buy the most expensive ATX psus possible.

You can probably power two miners with one of these: http://www.ebay.com/itm/IBM-24R2711-BladeCenter-2000W-Power-Supply-DPS-2000BB-24R2710-/311083483747?pt=US_Server_Power_Supplies&hash=item486e054263

Hes playing dumb, everyone knows hes a joke.

The dumbass cant even put better effort to fool newbies.

15% constant diff increase? 3'000 G difficulty in Oct 2015? Or 21'000 PH?
Let's take that by that time mining hardware will use 0.5 kWh/TH, and electricity at $0.1/kWh ...
Bitcoin has to be valued at $6000 just to cover this running costs. Nice

dude, i can't belive you have so much activity and still know nothing.it's either you play dumb or ?are you that dumb ?it's not just 14 BTC, you have to add import tax, psu costs,maintanance, cables, everything else !
with all this money you can buy  23 btc from start !

Based on static conditions - 300 Ph/s network hash rate, 0.1 USD/kWh, $500 USD/BTC and immediate mining start, AM's new Prisma overtakes the S3+ and closes the gap on the SP35:

SP35 costs 4,035 USD inc. PSU + shipping for 6 Th/s at 3.5kW, it would take 147 days to break even,
10 x AM Prisma costs 9,250 USD inc. PSUs + shipping for 14 Th/s at 10.5 kW, it would take 158 days to break even, and
S3+ B9 costs 320 USD inc. PSU + shipping for 453 Gh/s at 355W, it would take 173 days to break even.

Also, here's how much profit they'd make each day (mining income - power costs):

SP35 = 4.6 USD/Th
AM Prisma = 4.2 USD/Th
S3+ = 4.12 USD/Th

I'll leave you to your own estimations with regards to changes in BTC price, changes in difficulty and pre-order waiting times but I will remind you that Prismas will be shipping a full month at least before SP35s and there's no availability date regarding S3+ B10s or S4s. A full Prisma set would make 1,764 USD (after power costs) in 30 days under the static conditions.

Here's a question for you RoadStress. Given the 1 month head start for the Prisma, how long would it take for the SP35 to overtake the Prisma in total mining profits? Show you're working as well. Oh yeah, and where's that 0.1 BTC you said you were going to send me.  

Edit: A mistake was pointed out where I was using the fixed 500 USD/BTC price for initial purchase costs and break even time, which I've now changed to $400 USD to be more reflective of the current conditions.

10 x AM Prisma costs 7760 USD inc. PSUs + shipping for 14 Th/s at 10.5 kW, it would take 185 days to break even,
SP35 costs 4,035 USD inc. PSU + shipping for 6 Th/s at 3.5kW, it would take 198 days to break even, and
S3+ B9 costs 282 USD inc. PSU + shipping for 453 Gh/s at 355W, it would take 214 days to break even.

Mining Profit/Th/day:

SP20 = 3.25
SP35 = 3.4
S3+ = 2.92
AM Tube = 2.1
AM Prisma = 3

Please show me the miners who are paying 0.05$/kWh!

Also would you be so kind to explain why are you making a projection with such a low electricity cost for AM miners, while when making projections for competition you use higher electricity prices:


I do understand that you are biased, but at least try to make the projections the same for everyone, not giving an advantage to AM miners.




He is an AM shareholder, but is is to shy to put it in his sig.

The part which says, "Shipping date: 8th October, 2014 to 27th October, 2014".

I love the look of these miners!

These look cool and all, and the Prisma seem to be a more efficient miner than the original Tubes.

All that said, I'm with the others on this one, doesn't seem to be any ROI in sight unless these somehow ship this week, not in October.

Either way, well done FC/AM for continuing to tweak and pump out these new designs at decent rates.  The 14 BTC for the 14 TH/s will never return that amount back(difficulty, PSU costs, import tax costs, shipping costs, cabling costs, cooling/electrical costs etc), but at least they're giving miners a good buying option compared to BFL, KNC, BA, AMT, Cointerra etc.

If you have to pay 25% import tax you are automatically disqualified from mining, sorry I had to break the news to you. And yes many people have free psus/cables but you can always buy cheap server psus for $25/kw.


If you've been following the difficulty you would know that the growth rate is slowing down not increasing and it's less than 15% average. The low btc rate will only add to the slowing.

Even in your unrealistic scenario where difficulty growth stays constant at 15% you can still ROI because the actual price of the 14TH is clearly 15btc not 23btc.

I think your first line is far closer to the truth of any ROI calculations than the link

Nobody knows how long it'll take for these to ROI (if ever) simply because nobody knows what's going to happen to USD/BTC exchange (if calculating ROI by fiat), nor the difficulty (if calculating ROI by either fiat or BTC).

But with the link in place, which is a highly optimistic estimate, there's specifically the issue of the difficulty.  Right now it suggests break even by 2015/06/13.  However, the next difficulty jump is in just 3 days.. (which is probably about as fast as you could get these sent your way if they even shipped right now), so click the 'next estimate' button, re-calculate, and hey presto... no more break even.

Additionally, if you bought $650 worth of Bitcoin right now at ~$400/BTC, you'd get 1.625BTC.  According to the original calculation, it fizzles out after 2015/12/10, having given 2.44433BTC in revenue, or 0.81933BTC profit.  At that time, the exchange is $833/BTC, so fiat profit would be $682.50.  On the other hand, that 1.625BTC would at that time be worth $1,353, giving a $703.60 profit.
( It's actually a bit worse for the harware, as this excludes operating costs. )

So not only does that scenario seem doomed to fail due to the realities of the impending difficulty increase, it's doomed to fail because you'd be better off buying and holding the BTC.

As much fun as these calculators are for giving lower/upper bounds based on some numbers one plugs in, they're still inferior to a proper crystal ball 

( The above is not a commentary on whether or not these will ROI - I'm with jimmothy on that one, get your own crystal ball. )

Neither - he's just handing out a healthy dose of reality; people asking about ROI need to do their own calculations/guesstimates.  His initial statement holds true, regardless... even if it never ROIs, it never ROIs faster than anything else out there due to the favorable price/GHash and W/Ghash.  Or is that slower... hmm.. brainhurt.

this guy must be very dumb or be working for friedcat. 
which one is it ?

Lol @ .
Lrn 2 unit of account, ur paying in BTC, not $$

like I said you are a joke
what kind of scenario is that ? 6-7 % diff increase ? are you dreaming ?
wait till you see a 20-25 % diff increase !

Sorry but I paid good money for my magic crystal ball and I'm not about to give away prophecies for free.

But anyways here's a scenario where these could turn a profit: http://btcinvest.net/en/bitcoin-mining-profit-calculator.php?diff=29829733124&dcosts=650&diff_mincrease=15&blpbtc=25&dhsmhs=1480000&diff_mincreasedecrease=4&btcusd=400.11&dpowcon=1100&btcusd_mincrease=2&pcost=0.05&calcweeks=32&dleadtime=2&action=calc*

*Disclaimer: guaranteed to be inaccurate.

lol, you are a joke

even with free electricity they won't ROI.remember they will start shipping in at least 2 weeks from now, you need to pay import tax in your country,and you also have to buy PSUs, cables etc.
you have all these for free ?

let's run a small simulation assuming everything will be in our favor, the small miner:



-only 15 % diff increase (which we all know will be much higher)
-14 TH/S
-free electricity

you will still be in a negative -7.7 BTC in more than 1 year from now on.after 1 year 14 th/s will be worthless

Why not share some of your magic crystal ball numbers? Why not back up your statement with something? We can all start throwing with statements. For example I state that these devices will not ROI. Prove me I am wrong.

Faster than any other asic on the market by far.

So when will the devices ROI?