Best miner hardware in case of Free electricity

[e46btc]

Hi guys!
In case of absolutely free electricity access $0.00 what do you think will the best model for present moment?
S7 is the most modern and very good rig, and it is energy saving model but looks like it is overpriced for this reason.

For sure I can calculate myself market price for
- S3 (450 GH/s for approx. $100)
- S4 (2.0 TH/s for approx $700)
- S5 (1.15 TH/s for approx. $350)
- S7 (4.8 TH/s for approx $1800)

To build 10 TH/s farm (for easier calc) I have to spend

1) 22 pcs of S3 = $2200
OR
2) 5 pcs of S4 = $3500
OR
3) 9 pcs of S5 = $3150
OR
4) 2 pcs of S7 + 1xS3 (for fare calc) = $3700

Ok next, even with higher shipping cost and more PSU req-s looks 22x S3 is the best value for money?
At least in case of any unit hardware failure I still have a lot of working rigs and there are more probability (??) to 'win a lottery' with multiple rigs because of qty maybe?

S5 also looks quite good but not as good as S3.

Sorry for my newbie question Good luck with your mining!
Thanks!

[1715157584]

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[1715157584]

1715157584

[1715157584]

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[-droid-]

you dont wanna "win the lotto" by solo mining with 10TH.. the odds are stacked against you

you want to pool mine with that hashrate and yeah S3 is best hash/$ but consider the space it requires.. do you have the room for that amnt of heat and noise and 22 s3's take up quite a bit of room

take a look at spondoolies gear too.. you can get sp20 for similar to s5 and they are slightly better.. or better yet go for spondoolies sp30/31/35 on ebay (with built in power supply)

[e46btc]

Thank you for the reply!
Sure no solo mining with S3, just I meant that (in theory) it might be more odds to find block with more rigs (qty) in the pool?

I have old server room with enough space for these 22x S3, noise is not an issue as well as temp.  Also 350W ATX PSUs are very cheap now, maybe not 'very' but quite cheaper than 550-650W power supplies.

I will check SP3x now, thank you!

[Finksy]

I'm going to post this again here, as I feel people have some misconceptions about solo-mining and how long it should take to find a block:

More realistically than trying to anticipate a time frame to find a block (because by nature that is impossible due to probability), is to look at every block that's found.  

At this moment, with 10 TH/s you have approximately a 1 in 46,338 chance of holding the magic hash every time a block is found.  Those odds do not lower at every block as the calculators would have you believe, they are the same odds every time (until difficulty is adjusted, and personally I would plan for a ~3% average difficulty increase between now and the halving)

You could have a 1 MH/s miner and the first hash that goes out is the winner, or likewise you could have 1 PH/s and go weeks without a block. Do yourself a favour and look at some of the medium-sized pools (like Eligius for example) and look at the block history and their luck.  The variance is huge, and they are operating with 14 PH/s.  For you to solve 1 block within 300 days would require flat difficulty and >100% luck in comparison.  Imagine how it would play out if "your" block was a 25% luck block (you would have to mine for ~3.25 years with your hashrate keeping up with difficulty if that was the case).

I hope this makes sense.

And as far as what you said about finding blocks in the pool, when you are in a true pool and not solo-mining, you don't have to be the one to find the block.  Payment is handed out based on the work your miners performed in order to eliminate the variance that exists when solo-mining.  Therefore in a pool, hash-rate is hash-rate, the more you have the more you earn, your hashrate will not have any perceivable impact on the pool's performance of finding blocks.

Also, you will need a larger than 350W PSU to power S3's.  Realistically with ATX PSU's, you don't want to load them over 80-85% for efficiency and durability (at least in my experience).  And even then at sustained loads that high with warm ambient temperature, you will see failures especially with lower quality PSU's. I would suggest >400W PSU's for standard S3's, and >450W PSU's for S3+'s.  If you have access to 240V, PSU's like those in my signature can save you a lot of money, as each 2880W PSU can power 8x S3 or S3+'s.

[e46btc]

I'm going to post this again here, as I feel people have some misconceptions about solo-mining and how long it should take to find a block:.

Thank you for this, sure I am not going to make solo with these rigs, just English is not my native language.
Please check above about odds. It might be more odds that 22x 450 GH/s will find block earlier than 2x 4.8 TH/s miners.  Just because of dispersion.

[Finksy]

Your odds are not affected by hashrate in a pool, only your income stream is.  Read the end of my last reply.

[Biodom]

People keep posting about these zero rates and make everyone jealous.
yeah, it looks like S3 is the best deal, but you have to add ~40 for PSU or PSU equivalent (could run three on one EVGA 1300 )
so 22X140=$3080 before shipping, so it is close between S3 and S5 and S5 might edge S3 since more units need to be shipped in the latter case.
reliability: S3 was rock solid.

[adaseb]

Instead of spending money on miners you should upgrade your 3 Series to the M3.

[notlist3d]

I personally would rather control fewer S4's or S5's.   But S3's are so low in price if you have free it's hard not to pick them.

Do it a little slower though if you get 20+ S3's I predict you will be having some growing pains.  That is a big jump to do all at once if never mined before.

[Amph]

remeber that all those s3 need also a bigger place, and they can be quite uncomfortable to have

and anyway the initial investment matter until a certain point, because you can always resell it, and i'm sure the s7 has a better reselling value

[notlist3d]

remeber that all those s3 need also a bigger place, and they can be quite uncomfortable to have

and anyway the initial investment matter until a certain point, because you can always resell it, and i'm sure the s7 has a better reselling value

I would agree also OP would need fewer.  I think 0 to 22 is just to big of jump.

With OP having free I suggest trying it slow as it is not easy to go from 0 to 22.  And to be honest I would be surprised if most electricity places that are free have that kinda power.

[okae]

remeber that all those s3 need also a bigger place, and they can be quite uncomfortable to have

and anyway the initial investment matter until a certain point, because you can always resell it, and i'm sure the s7 has a better reselling value

yep, i was thinking exactly the same, also dont forget that you must "secure" the future, i man maybe now the S3 seems to be a pretty good alternative, but i really think that S7 is a better invest now, i mean that maybe buy some S7 is a little bit expensive now but it worth.

[e46btc]

Thank you for replies guys.  Exactly S7 is really good but they are not In stock and no real ETA for further batches just promises as I can see.
So I voted for S5 for present moment.  As long I have free electicity and enough free space for hosting these - there is no reason to resell it later.

[notlist3d]

Thank you for replies guys.  Exactly S7 is really good but they are not In stock and no real ETA for further batches just promises as I can see.
So I voted for S5 for present moment.  As long I have free electicity and enough free space for hosting these - there is no reason to resell it later.

If free S5 is not a bad choice.  Only thing be warned they run hot and are loud.  So if you really do 9 you might need some cooling (unless your already getting winter air).

But I think you will be much happier with 1/2 of the miners to mess with.  I would go S3 if you got a "bargin" that you pay off soon.  But 22 deices is just not something I would jump into.

[Amph]

Thank you for replies guys.  Exactly S7 is really good but they are not In stock and no real ETA for further batches just promises as I can see.
So I voted for S5 for present moment.  As long I have free electicity and enough free space for hosting these - there is no reason to resell it later.

then what about the s5+? has a better efficiency, not like s7 but still better than the standard s5, and it takes up less space

so you have a bunch of s5 all in one big s5, it's like building a bigger and better unit in a RTS game, i see it like that

[notlist3d]

Thank you for replies guys.  Exactly S7 is really good but they are not In stock and no real ETA for further batches just promises as I can see.
So I voted for S5 for present moment.  As long I have free electicity and enough free space for hosting these - there is no reason to resell it later.

then what about the s5+? has a better efficiency, not like s7 but still better than the standard s5, and it takes up less space

so you have a bunch of s5 all in one big s5, it's like building a bigger and better unit in a RTS game, i see it like that

Personally I enjoy my S5+.   It has been a great miner few miners fun for a month without having to touch.

I highly recommend it.  Some had bad luck but my unit has been great.

[e46btc]

S5+ is great, but I can't find any offers right now?

[Next BillGates]

I don't know why peoples asking again and again the same question?
If electricity was free of cost, why would you bother about hardware?

[e46btc]

I don't know why peoples asking again and again the same question?
If electricity was free of cost, why would you bother about hardware?

Because the difficulty grows fairly quickly. With overpriced units it takes quite long timeframe for ROI.
Any hardware can fail before even investments returned.

And sorry but I am not expert for now, for this reason I asked for an advice.. 

[notlist3d]

I don't know why peoples asking again and again the same question?
If electricity was free of cost, why would you bother about hardware?

Because the difficulty grows fairly quickly. With overpriced units it takes quite long timeframe for ROI.
Any hardware can fail before even investments returned.

And sorry but I am not expert for now, for this reason I asked for an advice.. 

The surprising part is how often it is asked.  If you have free electricity it honestly is kinda hard to make a wrong move.

Just make sure not to have to old of equipment, there is a point think like BFL minirig.  Where it is just stupid to use at this point.  But A1's, S3's, etc cheap and "free" will roi depending on price you pay.

[Raimonn]

If you have free electricity, don't worry about the miner. Buy the one you can afford. Electricity price is one of the bigs problems in mining.