ANTMINER S2 Discussion and Support Thread - page 213.

Rishodi

member

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Quote from: visdude on March 15, 2014, 06:15:19 PM

I feel that Bitmain is skimping on the PSU. Assuming that they're using Enermax ERV1000EWT-G 80 Plus Gold which is approximately 90% efficient at around full load (996W or 83A total on the 12V rail), the S2 would be drawing around 900WDC (1000WAC at the wall*90%) from this PSU. That's a 90% (900W/996W) continuous load 24/7. That's too close for comfort. A 1200W PSU (75% load) would be more appropriate. Personally, I prefer a 1500W PSU (60% load) for the S2; much closer to peak efficiency which is at 50% load.

Bitmain should offer an option to sell the S2 without a power supply at an appropriately reduced price so we could supply our own PSU just like with the S1s or get rid of the relatively puny 1000-Watter and use at least a 1200W premium PSU. The cost difference for them shouldn't be that much especially when purchased in bulk.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817194101

I am also concerned about Bitmain's choice of power supply. As a rule of thumb, it's not a good idea to demand more than a 80% continuous load from a PSU. Sustained loads close to the maximum output will decrease power efficiency and significantly reduce the expected operating life.

Your estimates are the same as mine: considering Bitmain's claimed power draw of 1000W at the wall, we can assume that the power supply is operating at around 90% of maximum output. Even if it's operating at just 85% of maximum output, that is still an uncomfortably high level for a continuous load.

I feel that it would have been more prudent to offer a 1200W power supply to keep the load at 70-75% of maximum capacity, or allow customers to select their own. I would appreciate the option to purchase an S2 without a PSU so that I have an opportunity to select a more suitable PSU of my own choice.

Bogart

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Quote from: ineedit on March 14, 2014, 12:08:57 PM

Quote from: CroverNo on March 14, 2014, 12:04:29 PM

...

Bitmain can you please create an option to ship without PSU so I can overclock this bad boy to 2 + Th/S

..

Do you honestly think you can overclock it 2TH, that a 100% increase.

You would likely have to add more power supply capacity, increase cooling, and bump the voltage (probably swapping a bunch of SMT resistors), and you might still find that the DCDCs couldn't handle the increased load.

Still I'd like to see someone try.

Bogart

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Quote from: SVK on March 14, 2014, 12:18:04 PM

Now I'm really torn between Gridseed and Bitmain Sad

At this price I'm really unsure.

Gridseed is Avalon. They deserve zero support from the miner community.

smooth

legendary

Activity: 2968

Merit: 1198

Quote from: Minor Miner on March 14, 2014, 10:22:07 AM

If underclocked it is already pulling 1000W, you would need to add a PSU. I do not see how they will run without
a 1200W PSU if they really draw 1000W.

They were very clear on the first post that it draws 1000 W at the wall. Assuming 85% efficiency that means 850 W draw for the boards.

Photon939

sr. member

Activity: 452

Merit: 250

Yeah I don't want to buy one with the PSU included. 12vdc server supplies are available in nearly limitless quantities for pennies on the dollar. I'd rather Bitmain shave off $200 the price (maybe have options for with and without PSU?)

Xian01

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Activity: 1652

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Christian Antkow

Quote from: visdude on March 15, 2014, 06:15:19 PM

I feel that Bitmain is skimping on the PSU. Assuming that they're using Enermax ERV1000EWT-G 80 Plus Gold which is approximately 90% efficient at around full load (996W or 83A total on the 12V rail), the S2 would be drawing around 900WDC (1000WAC at the wall*90%) from this PSU. That's a 90% (900W/996W) continuous load 24/7. That's too close for comfort. A 1200W PSU (75% load) would be more appropriate.

I share your concern. It would be good to have the option to purchase one without a power supply so we can use our own 1200+ supplies.

I plan to pick one of these up after the first batch has been reviewed.

DarwinNexus

newbie

Activity: 56

Merit: 0

This looks awesooooome.
Not upset that I bought my Terraminer at the cost I did, but I do wish I knew this was being released now. Can't afford one at the moment, but will certainly be buying a few once the price is right. Grin

Remember remember the 5th of November

legendary

Activity: 1862

Merit: 1011

Reverse engineer from time to time

Quote from: visdude on March 15, 2014, 06:15:19 PM

I feel that Bitmain is skimping on the PSU. Assuming that they're using Enermax ERV1000EWT-G 80 Plus Gold which is approximately 90% efficient at around full load (996W or 83A total on the 12V rail), the S2 would be drawing around 900WDC (1000WAC at the wall*90%) from this PSU. That's a 90% (900W/996W) continuous load 24/7. That's too close for comfort. A 1200W PSU (75% load) would be more appropriate. Personally, I prefer a 1500W PSU (60% load) for the S2; much closer to peak efficiency which is at 50% load.

Bitmain should offer an option to sell the S2 without a power supply at an appropriately reduced price so we could supply our own PSU just like with the S1s or get rid of the relatively puny 1000-Watter and use at least a 1200W premium PSU. The cost difference for them shouldn't be that much especially when purchased in bulk.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817194101

I agree on the bit about the PSU. Although I do not own the S2 nor do I plan to(friggin' expensive Tongue

but understandable) the PSU is not enough. If the miner uses over 1kW then a 1000w PSU is simply not enough.

visdude

legendary

Activity: 1081

Merit: 1001

I feel that Bitmain is skimping on the PSU. Assuming that they're using Enermax ERV1000EWT-G 80 Plus Gold which is approximately 90% efficient at around full load (996W or 83A total on the 12V rail), the S2 would be drawing around 900WDC (1000WAC at the wall*90%) from this PSU. That's a 90% (900W/996W) continuous load 24/7. That's too close for comfort. A 1200W PSU (75% load) would be more appropriate. Personally, I prefer a 1500W PSU (60% load) for the S2; much closer to peak efficiency which is at 50% load.

Bitmain should offer an option to sell the S2 without a power supply at an appropriately reduced price so we could supply our own PSU just like with the S1s or get rid of the relatively puny 1000-Watter and use at least a 1200W premium PSU. The cost difference for them shouldn't be that much especially when purchased in bulk.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817194101

smooth

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I'm pretty sure it is also undervolted so you won't be able to overclock that much (possibly some).

pdawg

sr. member

Activity: 252

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Agreed, this is overpriced. We're moving into the phase of just buying BTC outright until more efficient tech arrives... buying 6 BTC makes more sense.

jelin1984

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also for customs

bitmain

what you will have to write as value?

klondike_bar

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ASIC Wannabe

Quote from: davida on March 15, 2014, 11:33:10 AM

They say they are using a 14U rack... But those photos on page one look smaller than a normal 14u rack.

http://image.google.com/search?q=14u+rack

The PROTOTYPE is not 14U in size, but is also not 4U. I would guess about 6U (6U = 266.7mm). Lookng at the prototype, its roughly the hieght of 2x120mm fans).

I assume they will make everything more compact and visually appealing by the time they ship 4U size in april

jedimstr

hero member

Activity: 798

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Quote from: davida on March 15, 2014, 11:33:10 AM

They say they are using a 14U rack... But those photos on page one look smaller than a normal 14u rack.

http://image.google.com/search?q=14u+rack

No...
They said 4U rack case. Look again.

rausvi15

hero member

Activity: 806

Merit: 507

Trusted Campaign manager

in the offer is now a lot of these 1ThasH Miner, for example alliexpres.com:

http://www.aliexpress.com/wholesale?SearchText=1t+bitcoin+miner&catId=&initiative_id=SB_20140315084333&isPremium=y

I think this is the final defeat of butterflylabs and probably KNC to ..

davida

sr. member

Activity: 585

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They say they are using a 14U rack... But those photos on page one look smaller than a normal 14u rack.

http://image.google.com/search?q=14u+rack

mitak64

full member

Activity: 254

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Yes, we want pics !!!

MisterLG

sr. member

Activity: 476

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Bitmain, do you have more pictures of the S2?

How far can we overclock?

BITMAIN

hero member

Activity: 741

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https://www.bitmain.com

Is it possible that 1000W PSU draws only 1000W from the wall?

Yes, it is. As there are some safe margin when we chose the PSU. The Enermax is not running at its full capacity.

How should we chose from S1 and S2?

When the infrastructure will be ready?
If your infrastructure has to wait for another two weeks to be ready, I think S2 will be better.
What is the most scare resource in your mining operation? Capital or the infrastructure ( Energy, cooling system, etc)
For some miners, they are not lack of money to have the hash rate they want, but they don't have enough room, electricity supply for S1. A enterprise level miner might have spent 100k USD and more than one month to build a hosting farm, but if they want to maximum the hash rate, they should chose S2
Do you have enough PSU units?
Sometimes, buying a PSU is hard. S2 will be better.
Does your electricity cost low or high?
We know that there are some area and opportunities to have ultra low price electricity, however, it is not the case for everyone. If your electricity price is not low, S2 will pay off in the long run.

MisterLG

sr. member

Activity: 476

Merit: 252

Quote from: Anddos on March 15, 2014, 08:20:58 AM

How many units are they shipping in batch 1 and 2?

Only Bitmain knows

Topic: ANTMINER S2 Discussion and Support Thread - page 213. (Read 355820 times)