This is another post i wrote elsewhere to justify my offer on a titan, without free electric. The highest i see advertised is $4000 USD (4 BTC).
Bitmain antminer L3:
https://asicminermarket.com/product/l3-litecoin-miner-250mhs-400watt/A GOOD KNC TITAN is 400? MH/s @ 1300w @ the wall. Most are 320, my math is based on 400.
The antminer L3 is 250 MH/s, 150 MH/s less.
With the 250 MH/s L3, this is your profit at 10c /kWh: 119.15 USD / month
https://www.litecoinpool.org/calc?hashrate=250&speedunit=MH%2Fs&difficulty=102398.53515485&price=3.8996¤cy=USD&power=400&energycost=0.10With 400 MH/s, 1300w @ the wall:143.12 USD / Month profit (At current diff).
At your cost, it would take 25 months to ROI provided diff remained the same, which it isn't as new hardware is coming on the network pushing it up. So an already 3 year old miner would need more than another two years to ROI if diff remained the same.
The monthly profit of the bitmain is lower, but the price is also £800 GBP lower roughly, and as it is new hardware with a warranty your chance of hitting ROI are better.
You are asking 3.8 BTC. for 4 BTC i can get TWO bitmain units, which would at 500 MH/s at 800w at the wall at 10c / kWh would give me: 238.29 USD a month profit, just under $100 more a month than your titan, new with a warranty from Bitmain.
https://www.litecoinpool.org/calc?hashrate=500&speedunit=MH%2Fs&difficulty=102398.53515485&price=3.8996¤cy=USD&power=800&energycost=0.10Titans used to go for insane prices due to the profit and I made boatloads of profit from my titans and sold them all off just before Bitmain announced it, but even then i got £2000 for one, £1750 for another which was a fair price. Now though, you will not sell one for 1.5 BTC, let alone 4 due to the diff increases.
So we have a comparision:
1. Your titan - 3.8 BTC + Shipping + Customs duty to UK would total 4 BTC probably for me. 4 BTC ($4000, $143 a month profit at 10c kWh so a 30 month ROI if diff remains the same (it wont))
https://www.litecoinpool.org/calc?hashrate=400&speedunit=MH%2Fs&difficulty=102398.53515485&price=3.8996¤cy=USD&power=1300&energycost=0.102. 1 Bitmain L3 - 1.94 BTC + Shipping + Customs duty to UK, totals 2.1 BTC for me. ($2100, 119 USD/month profit, 21 month ROI at 10c kWh if diff remains the same (it wont) )
https://www.litecoinpool.org/calc?hashrate=250&speedunit=MH%2Fs&difficulty=102398.53515485&price=3.8996¤cy=USD&power=400&energycost=0.103. 2 Bitmain L3 - 3.88 btc + shipping + customs duty, around 4.1 BTC. ($4100, $238 / month profit at 10c kWh, if diff remains the same)
https://www.litecoinpool.org/calc?hashrate=500&speedunit=MH%2Fs&difficulty=102398.53515485&price=3.8996¤cy=USD&power=800&energycost=0.10Note options 2 and 3 have a warranty, splits it across two rigs (if a KNC titan has a ground fault, all cubes die, if controller dies, your stuffed and many want insane prices for controllers they can't sell)
Due to the risk in purchasing it (diff will probably double by the end of this year, meaning ROI would be 3+ years on this rig, i would have my offers on titans stand at 1 - 1.5 BTC. I am not lowballing but being realistic about my investments.
I thought i would write this hard math, at the current diff of 102k to ensure that people do not get ensnared into buying one, the loss of money will be massive, make no mistake. If you have free electric it MAY be worth the risk, but not with the bitmain HW around.
