Topic: Does worth mining with used S9s? (Read 593 times)

Yeah, since this thread started BTC's gone up almost 20%, they sort of price miners accordingly.

Used via Kaboomracks, but they are back to 230ish now. A few months ago when bitcoin was under 4k... And along those, the used M3s from Pangolin at $50 (now gone), oh and the m3x back then was $75.

I made this capture from the Pangolin shop in January:

GZ Woao Trad e Co., Ltd. BTC LTC DASH ETH MINER - from Aliexpress.


It's not Pangolinminer... It's a seller on Aliexpress.

I know about pangolinminer.com it's good price but it's pre-order and can't wait till August/September to start mining.

do you mean pangolinminer.com ?

I have purchased over 10000 USD in gear from them.

they should be good for you.

they have a telegram  site if you go to the website you can look for telegram link and ask what used miners they have.

https://pangolinminer.com/

this should get you into telegram

https://telegram.me/PangolinMinerOfficial

I post on the channel at times.

That gives us nothing to work with. Where the seller lives and country of origin means nothing. WHO is the seller or what is the company name you are asking about?

Seller origin was from Singapore, product was from HK. Its trusted ?

Great find, like PassThePopcorn was saying $/Th, $230/11.5=$20 per TH including shipping!

https://pangolinminer.com/ was selling used S9 13.5T not too long ago for $130 plus shipping but they were gone in a couple of days. Grab those M3X while you can, doubt anyone will sell you just 1 to try, deals on used miners come and go quickly.

That deal is very good.

The low power firmware allows 1600/1700watts  and 10th.

Since your power is free  10th earns about 0.0003715 btc a day or 2.12 usd a day so 110 days you are paid off. As you have free power.

No, here don't have any restriction for mining. I have a problem, I ask them to buy 1 unit and after I will buy more... it's because I don't trust anyone who sells second hand miners. Also shipping is too high.

However I've found now M3X for 230usd (inc. p5 psu&shipping)..M3X have high power consumation but for start isn't good?

You have to buy in bulk and use a broker to get good prices on used s9s.

And since you are not in a mining friendly country it may be hard to do.

I know more then one country that restricts imports of gear.

Even the USA is now taxing at a very high rate of 27.6% and trump is saying he wants to raise more !

I tried sending a few to Egypt and restrictions were very hard to do so. Brokers sometimes can get around restrictions.  A purchased of 20 or 30 units can be done by them.

Sometimes they may find a guy in your own country. So import rules don’t apply.

If you don’t like the one I mentioned try kaboomracks. He has been doing international deals.

Thank you so much for all.

But 200$ it's impossible...

In my country I can't buy even a M3 / M3X with 200$... I talked with a seller in Alibaba to buy some miners and shipping was 190$ DHL/Fedex.

The price is far too high.

I know you are not in USA but I can not stress more then if you go s9 of any kind used is better.

200 used  with a psu  vs 400 new with a psu

pretend you have the power to run 20 of them

so 30 x 200 = 6000 USD

and

20 x 400 = 8000 USD

So from the start you are 2000 USD ahead.

run the 30 units at slow speed you use 30 x 800 = 24000 watts    you do about  30 x 9.5 th  =  285 th

run the new units at medium speed you use 20 x 1200 = 2400 watts  you do about  20 x 13 th = 260 th

so you are 2000 ahead with the old ones
you are 25th ahead with the old ones
you use the same amount of power.

yes the old ones will break faster  so one breaks in a month  you lose 800 watts and 9.5th

just set two to higher speed  they use that missing 800 watts and they add 7th  which is a drop to 282.5th  

you still using same power and are  at 282.5 vs 260  

you end up tied in power once 10  used ones break down  but I can bet it would take many months for that to happen.

and you are still the original 2000 Usd ahead by buying used  gear along with all the months you had more hash power  since used starts at  285th and new starts with 260 th.

I just made you about 2 grand Plus maybe 6 months of 12.5th  hashpower which is  300 more .

so used 30 used s9s  at 200  is about 2300 better then 20 new s9s at 400 after a six month time period.

but you need a broker or a source for the gear.

I am just giving you simple math here.

I mine with a lot of used s9's paid 150 to 250 with psu's included doing it since dec and around 3 or 4 of 24 have worked poorly (still work but poorly).

while 20 or 21 work well.

Cannot stress enough to do proper electric infrastructure by a qualified electrician, you have a lot of free electricity that can make you BTC or fry the proverbial goose, literally fry.

What is wrong with new S9j's?

I wish you good luck with those new s9j's

You can buy that it's too cheap but are those used units strong ? No.

Everywhere Alibaba Aliexpress eBay etc. I've asked sellers about lifespan of an used S9s and their response was "if you run it 24/7 it will be dead after 6 months."

So buying used S9s cannot calculate profits, they say 6 months but it may be dead after few weeks, who knows.


I do not trust him, what I see he have sold many miners but no one have rated him here, that's why I do not trust also his personal website is a joke not from a professional.


I've asked a electrican and he told me for that power it's needed a cable 35kV, cost is very high for 35kV in my country. He told me may cost 3-5kEur.

Most of second hand miners are supplied by Chinese and As the BTC price rises they increase the price. Today I inquiry from China for 20 second hand, S9s  , 13.5 TH (30 days warranty remains) including psu for 246 $ without shipping cost.

His prices are from alibaba, think ebay pricing.

That price seems to be double the going rate for S9s...

Note I sent a pm to you.


Dude you want used ones 200 with a psu is easy to find.

First off  what country are you in?

Second  how hot is your space?

Do you have the correct wire setup?

If you are USA based I could help you fairly easy.

If you not in USA  you should work with a broker

OffordScott is good.

He has a link here.

https://bitcointalksearch.org/topic/asic-miners-for-sale-by-offordscott-western-hemisphere-americas-5138318

he also has telegram channel.

on telegram.

This is good idea , but as far as I can guess OP is really concerned with ROI or ROR   so I did want to do some calculations, just take a look at the table below I tried to put some numbers to make it more understandable.

Note that the green columns are same for both quantity so no matter what you put result will be same,   as well as BTC price ( i assumed 5950 $ you can put whatever you want ).

so u can see 29 pcs have better ROR.

http://i67.tinypic.com/2rwnuxk.jpg

Thank you for this idea it was really helpful.

150$ S9s? Please do you have any link or contact? All what I've found it's 385usd per unit.

If you underclock them with Braiins OS you can even add more of them. By raising efficiency you can easily lower that consumption to under 820w each (@10T)... You could put 48 S9s, maybe some more if a few have damaged boards.

480THs vs 390THs using the same 40kW...

Make sure you check more sellers, i have seen S9s at $150 each...

PLUS, under-clocking tends to make them run cooler and last longer.

I use that site but problem is where I can buy...

Official sites are out-of-stock, vendors there are completely scam. I have bought on cryptouniverse.at this Sunday and still Processing, I dunno if it's scam or out-of-business.. anyway I will see.

Have you tried to check this site https://www.asicminervalue.com/

You can see all profitable ASIC machines if you are not paying on electricity bill then this is a good choice and Im sure you will make more profit than buying a 2nd s9.

This is just a suggestion because there's no guarantee that the 2nd hand s9 will live long in mining.

Well that's a being taken care of thing, you took care of it to the point where it could continue working for a long period of time. The buyer on the other hand ran it to it's max and in simplest of terms burnt it out. So I could have put in the wording of "It all depends on where it came from for the life" to "it depends on where it came from and where it will be", but I figured it's just common sense that if it matters for it's previous environment that it would matter for it's next environment.

If the device is well taken care of it will last in most cases.

In other ways too it depends on the user, I sold an S5 locally and had the buyer contact me a month later saying it died. He had however overclocked it to fuck send had it out of the tunnel in a thing of coolant. It had been hashing away in my office in an A/C room undervolted previously not a dusty mine. It's all really just luck, and use case.

I will check that section, thank you so much for the help.

$/th the dollars you spend per terahash.

With your example of $385 for an S9 @13.5th that would be $385/13.5 or $28.51 per terahash.

I'm not sure what the seller is talking about, I've ran S9's for over 2 years without issue, however I have also had them arrive DOA. It all depends on the environment they come from as to if they will last a long time. A miner that comes from a dusty, humid data center / garage will likely die quicker than one that was well taken care of.

I would check in the marketplace on this forum, there are some bulk deals as well as smaller offers.

https://bitcointalk.org/index.php?board=75.0

Do you have any suggestion with what miner should I start and where to buy?

I have talked with a seller on Alibaba for a used S9 and told me if I run it 24/7 it will be dead after 6 months... So with that ROI (without electricity) was 5 months so I had only 1 month to make a profit.

Please can you explain this "keep your $/th low" ... should I low hashrate to the miner so It can mine less and stay longer?

Thanks!

I read the amount of power available wrong. Again when you have free power all you really care about is the $/th while keeping power usage under what you have available.

Mining has two costs:

1) Operating (cost of electricity, maintenance, internet, space).
2) Cost of the unit.

The majority of operating costs usually goes to the space and electricity, if you already have the space and the electricity is free this cost is not really there, so you are only left with the cost of acquiring the  miners, to maximize your earnings just keep your $/th low. The better the miners efficiency is the more you will earn per usage of power, meaning you will be able to run more miners with your free power so you will in turn earn more. With free power you just need to get the most hashrate for the lowest price.

I have free electricity up to 960kWh that is for 24h - 40kW running 24/7. Place when I will run miners will be in a warehouse so hot/loud it's not an issue.


Yes, I don't include electricity but problem is price of a miner & shipping is too high so I can't pay for a USED miner that have ROI 4-5 months. What if it's broken/lower hashes etc.

About free electricity:

1 S9 - 1.35kW
30 S9 - 40.5kW
960 kWh = 40kW

As long as you have free electricity, getting a miner that is the best $/Th is what you are looking for. The things you look at when buying a miner is the cost of the miner and the price you need to pay to run the miner. If you remove the price you pay to use the miner (electricity) then you are looking at the price to acquire the miner.

960kwh would be about half of a S9, in reality 960kwh would be half of almost any machine out there right now. So that should be taken into account when figuring out what you want to get, especially if you only get 960kwh for free, this calculation of half a miner doesn't taken into any account of what your home uses.

If you have free electric ANY miner is good. The question then becomes how much free electricity do you have: just a few kw or more? Please do remember that miners are hot and loud. Can you deal with removing the heat from where the miners are? Please ref the 1st time/small miners guide.

What about another miner that have good profit if have free electricity?

A few more months shouldn't be an issue but I bet he's not adjusting for difficulty but if we're in a bull market hell do even better.

Just to add to this, since you've said that the Antminers are used, it also heavily depends on how worn out these devices actually are. It's sort of "mileage"(for a lack of a better word) might be quite high already, potentially giving you significantly lower hashrate.

This question is related with mining section. You can ask this question in there or you can move this topic in mining section. I am sure someone will help you ASAP.

Yes, you have right..

I found on Aliexpress for 385usd/free shipping.

But it's used, ROI for that price it's 3.9 months.. can this miner works 24/7 for min of 4 months?

I mean with free electric anything can be profitable, but that price is a bit high. Hell S9s are on AliExpress for $365 shipped with PSU.

Hello,

I have found larger quantity of used S9s 13.5TH/S for 436‬USD (inc. shipping) per miner.

Does it worth buying them, I have free electricity up to 960kWh.

Also there is a problem, there are used s9s .. ROI per unit it's 4.6 months with the current profit. Can one used S9s works 24/7 for minimum of 5 months?