Topic: [GUIDE] Undervolt antminer s1 [1.19W/GH at the wall] - page 21. (Read 69499 times)

You have 4 potential mining setups being discussed:

1) 24 OC units running 4.9TH/s @ ~9.9kW (200GH/s + 410W each)
2) 45 OC units running 9.0TH/s @ ~18.5kW (200GH/s + 410W each)
3) 57 UV units running 8.0TH/s @ ~9.5kW ( 140Gh/s + 166W each)
4) 24 OC + 33UV gets 9.4TH/s @ ~15.3kW (200GH/s + 410W for the OC, and 140GH/s + 166W for the UV)

I think he's talking about moving from setup 1) to setup 3), which would increase your hashrate, keep you at your same power, and cost you 31BTC.

You're talking above moving from setup 1) to setup 4). Yes, 33 UV Ants would get you ~5TH/s, but you're not looking at the loss of hashrate that you'd be getting from undervolting the other 24 units. Moving the original 24 Ants from 200 to 140 loses you ~1440GH/s, while you'd be gaining ~4950GH/s, netting an increase of ~3.5TH/s.

Think of it this way: You have 5 Ants that are running 200GH/s @ 410W. You're getting exactly 1TH/s @ 2050W. If you were to add 2 Ants, and undervolt all 7 of them to 140GH/s @ 166W, you're looking at a combined 980GH/s @ 1160W. You paid 1.88BTC (not including coupons/discounts) to stay at the same hashrate, and drop your power consumption.

At current Coinbase, that 1.88BTC = ~$1050 USD. Moving from 2050W to 1160 saves you 890W, which at $0.14/kW, is ~$90 USD/month. You're paying $1050 up front to save $90/month. Might not be worth it.

This same calculation is the same whether you're buying all your Ants now, or buying some ants to compensate for undervolting your existing farm. If you're looking at buying now, and you have to choose between 5 and 7, you're still ordering 2 extra units to save power.

The only scenario this is beneficial is either A) You're running into massive temp issues, and cant seem to get these things cool, and they're constantly being cooked and destroying themselves (aka you live in a desert), or B) you're up against a power limit, and this is the only way to increase your hashrate. I think Tzortz fits into this category, so it might not be an entirely bad idea.

Nice mod. Undervolting has a far greater effect than underclocking does on profitability. I'll be looking at doing some undervolting in a few months when summer rolls around.

Indeed, as of course ants have shown great durability , and are tested to last.
I have no clue about the S2 or the Dragon products about their credibility.

The downs are only, you need more cabling and definitely more space to handle so many ants.

interesting idea to save power costs and get more hashing power, i think 1 thing people also tend to forget when mining is if 1 of your ants goes down it's a small dent in your mining power but if 1 of your th's units goes down it's a serious dent in your hashing power and will cost alot of potential earnings until it's running again or replaced that's something to think about and worth considering also.

I cannot undestand your calculations.

Lets start again.

I need 57 miners to reach the 8.5 Th/s , as underclocked.

I already hold 24 miners, so I need 33 pcs more. Which you agree on this.

33 pcs , as underclocked will hash approximately at 5 Th/s ( 33 x 150 = 4,950 Gh/s).

33 pcs normaly cost 33x0.938 = 31 BTC.  So, 31BTC / 5 Th/s = 6.2BTC per Th/s.
Which is lower than any preorder S2 (6.37BTC PREORDER CLOSED)

S1s are ready to go from Bitmain , can order as many as you want.

Plus I have 40 S1 coupons waiting with 0.12BTC each, where I could buy S1s for 0.81BTC and making cost of 5.35BTC per Th/s.

So no need to sell anything, as I will lose on ebay fees plus I will lose hash time reducing my hashing speed.



.

In order to grow from 4.9Th to 8.5Th you would have to go from 24 antminers to 45 units if all run at ~200GH overclocked.
If underclocking to ~150GH, you are looking at 57 miners. 

that means paying >32 BTC in order to add 3.6TH  (or 12BTC/TH)

underclocking at this point is a terrible idea. either create a second mining location or sell the antminers to buy 1TH/1000W units (s2 or another company) - otherwise you are thrpowing away your earnings

The resistors are all marked R3 on the board.

How to apply the graphite: http://www.youtube.com/watch?v=LNXSHpPACGs

But don't try this mod if you haven't got a multimeter!!

Can you give more details how we apply pencil hb and and which because at first photo you have the heatsink and I can not see good

I'am not running the default fan, I am running the Delta PFC1212DE-PWM (the default fan of 2/3 antminer s1 was not starting, so I change the 3 fan to have the same) :

With the default fan and stock clock, I had 45/47 for 2000 RPM)
With the Delta PFC1212DE-PWM and stock clock, I had 40/41 for 2040 RPM)
With the Delta PFC1212DE-PWM and pencil mod @ 0.85v/275Mhz, I got 35/34 for 1500 RPM and it's fucking silent !


At 2000 RPM, the Delta PFC1212DE-PWM make a little more noise than the default fan but at 1500 RPM it's like a church !

In the pics its showing low 30's with 1500 rpm fan speed. Nice.

VERY NICE! Glad to hear it worked so successfully for you!

I'm assuming your temps are also a LOT lower? You could probably run a normal 120mm case fan on idle and it would cool the whole thing, right?

You are right, definitely will last longer.

Plus your ants will probably last longer.

Some of us, want to invest more in mining. I operate 24 ants and I am on power limit. Only solution to increase my hashing speed is either to replace all ants with 1w/1ghs fresh equipment , OR to underclock the existent ants for better efficiency.

With this method, I can increase my hashing speed from 4.9Th/s to 8.5Th/s and maintain the same power requirements.

only if you want to earn 20-30% less from the unit at the benefit of saving a dollar a day on electricity - but if that still looks like a good use of your miner go for it.

I was at my limits of power/heat/noise and I came up with a simple solution. I found a larger space to run my miners that had better cooling capabilities, and I spent $1500 installing 18kW of new circuits and some shelving units. I went from a limit of 9 antminers to operating 14 now, and have an S2 ordered also.

In this game, i dont see why you would willingly reduce your hashrate at this point in time - I might do it once july hits and the difficulty/temperatures play a more significant factor, but right now is the best time to run the machine at it full capability

No more space?

If you have no more space, no more power and the room is getting too hot, this is helpful. 

It is not a bad idea to underclock an S1 at this period. They are inexpensive and can compete the 28nm, as on power requirements.

Depend on how much Amp you have.

I was close to the limit and I will receive some miner (hex8) next week, so I needed power ^^

nice job!

however, I dont see any point to unervolting at this point. maybe by late summer when the the difficulty is as high as the temperatures, but right now getting the most hashes per second is my focus