Topic: ANTMINER S2 Discussion and Support Thread - page 59. (Read 355730 times)

"So don't think because these PSU's are running at 95 or 100% they are only like 50% efficient, they still maintain near 90% efficiency even at full load."

Obviously not, where did you get that crazy idea from. 

Quick question: I'm looking around town for a place to host 4 Antminer S2's..

So far the best deal is a half-cabinet with a max power draw of 2.4kva. Would this be enough to power these four machines (totalling approximately 4000w)? Thanks.

Lo all.

About to pick up a couple more S2 but all my coupons have expired.

Anyone with some coupons spare a couple? Will tip!!
Name on bitmain site is the same.

Thnks all

Because of advertising they want the highest rating to advertise.

That 4% makes a big difference especially if the psu is rated at 1000 watts and the mining rig pulls 1050 or more.  I don't have experience with ener max gold plus 1000 but some seem to believe it is inadequate for the s2.

It could be that you may be able to overclock the S2 with a better power supply, but from the people who I have seen try it you only get a measly 10% increase and at the risk of much higher HW errors. These aren't Jupiters that you can push to 50-60% overclocks, the entire design ethos around the S2 is different, these are basically underclocked S1 antminers crammed into a single box. I think the backplanes and power components on the boards just aren't built to handle more power higher currents.


I'm sorry I see this wrong information mentioned so often I just have to say something here. The 50% load efficiency myth is just that, a myth. Modern, quality 80+ Silvier/Gold/Platinum power supplies are only 1-5% less efficient at 100% load than they are at 50% load, heck they are least efficient usualy between 1-25% load.



If you don't believe me read some proper PSU reviews from somewhere like jonnyguru.com, heck lets just go right to the review of the PSU that comes in the S2.

The Enermax Revolution 87+ 1000W http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story3&reid=270

The difference in efficiency between 50% and 100% in the hot tests is 4% and in the "normal" temperature tests its 3.6%

So don't think because these PSU's are running at 95 or 100% they are only like 50% efficient, they still maintain near 90% efficiency even at full load.

Curious how you both think the S2 is a better deal

Price
S2:    $2359, 1000GH = $2.36 per GH
SP10: $2795, 1400GH = $2.00 per GH

Power
S2:    1000 GH, 1000W = 1w/GH
SP10: 1400 GH, 1200W = 0.85w/GH

PS Both are beaten on price by the A1 clones, which can be had for around $1800, or $1.80 per GH (if only all the dealers weren't sketchy)

Yep, their reluctance (or greed) to reduce the price while everyone was pissed off with BM has cost them greatly. What's better, sell 1 miner for $500 profit or 10 miners for $200 profit... spondoolies definitlely missed the boat here...

The SP10 is such a crappy deal compared to the Antminer S2

They seem to be picky about pools.

My S2s run like champs on Eligius.

On BTCGuild, one had 36% "bad", mostly "unknown".  The other was 1% bad.

On p2pool, they run around 920-930gh/s, and more than once I've had errors appear (x's or dashes) as soon as I point it to p2pool.

M

I have 4 batch 4 S2's that max out at 1100 then drop down to 800-900 then back up to 1100 constantly, never a stable rate.

I tried spreading the load out over 2 power supplies today but it made no difference [1 seasonic 1000w and the  S2 enermax 1000w]

Two high quality 660 platinum are enough to push 1400 watts easily.  Sea sonics can he had after rebate for $80 every few months.

How are the 10 boards powered from the power supply? 10 atx wires? (oh 6 atx to power board) 3 per 750 power supply then!
Wouldn't it be cheaper and more efficient using 2 750watt supplies? of course one would be outside the case.

I would think as we phase out the S1's those left over 750's would power these easily.

anyhow that is what I would do instead of running a power supply at 100% 24/7/3.
   3 being for 3 months when it fries itself.. haha.
even 2 600's or 650's.

guess its about time to bite the bullet and buy an s2...

+1 me too - nearly ordered one before I seen your post...

Thank you for the reply, I'll hold off for now.  Appreciate it.

Actually, 16 gauge wire is rated up to 13A (safely 12.5A), so it should be fine in US for S2 (no need for 14 gauge).
the confusion about 10A stems from the fact that it is 13A for a single phase (residential recepticle) or 10A for three phase
see
http://www.rvpowerprotection.com/Links_files/extension-cords.pdf
and
http://www.chromausa.com/pdf/app-notes/AN%20-%2061500_61000%20-%20Single%20&%203%20Phase%20Power%20-%2003122013.pdf

Assuming Enermax cable is minimum 16 guage thats 10amp.  Could be psu is struggling at full load to supply the necessary amps to miner, because even 1000 watt  unit is most efficient at 50% load rating this drops at 95-100%.  Maybe switch the power cables for another test that would narrow down.

Could be networking issue which I have found has been the cause of most of my unexplained pain.

Try swapping the network cable from the best miner to the worst miner and run for a few hours...

 

buy one new for 195 and get back 2900  in point = 29usd to spend later.

read how here.

https://bitcointalksearch.org/topic/m.7073381

there are more discounts possible  so a new one is about 160 with  a 10 year warranty