Topic: ANTMINER S2 Discussion and Support Thread - page 58. (Read 355820 times)

My kill-a-watt reports just on ~ 9 amps on a US 120v circuit for the S2, when cranking ….

$400 voucher and/or bitmain will work with you. You could cook breakfast on the SP10 and it howls like a banshee … definitely begs for a DC home which is an additional expense.

Looking to buy 3 S2 units and 3 S1 units.

PM me if you have coupons.

Thanks

Rob

For a sec it looked like you [email protected]  was gonna give away some coupons.  lol

PM me if you have a valid S2 coupon code. Same nick @ on bitmaintech.com

[edited to deter confusion]

Not many indeed because there were not alot of buyers for the latest s2, and those that have them are waiting to see if there is a dramatic price drop this week or next.  So their coupons might be in addition to another 200-300

S2 has lots of coupon on the wild, makes it a much better deal.

Don't happen to have a voucher the deal gets better.

its close to $200 to ship the SP10, and realistic values are closer to 1.25TH on 120V and 1.4TH on 208/240V. It is also the volume of a blow dryer when running. The design itself and the efficiency is terrific on it though   DC usage with 208V is ideal

no include shipping last I heard

Does the Spondoolies price include shipping?

I also heard that the 1.4TH/s is very dependent on your power setup, but I haven't checked in to the accuracy of this claim.

we cool  

Yes power delivery is a sketchy question indeed.  There is a "bell curve" for both the psu and also a "Bell curve" for the asic chips also.  This is where Bitmain will probably have a newer design soon with a redesigned chip I suppose as everyone else is going to a less than 1watt/GH now

No, you only have enough power for 2 machines. 2.4 kVA can power a theoretical maximum of 2.4 kW at a power factor of 1.0.

First, apologies your post got the self righteous end of my post, wasn't meant specifically at you personally I get you were talking more about the power chord being able to supply enough juice to feed the PSU.

Regarding the draw on a S2, it just means that it pulls more from the wall socket than 1000W which all PSU's will do if they are providing 1000W to the equipment they power, because no PSU is 100% efficient, so if its 90% efficient at full load it needs to pull near 1100W to give out 1000W (give or take a few W)

When people say that the rig is pulling 1050 they mean using their watt-o-meter, all the slightly lower efficiency means is that it pulls a few Watts more from the wall.

1050 watts at the wall in the case of the PSU on the S2 would mean its probably providing 916W to the miner (87.3% efficient) in fact in order to provide 1000W to the miner it would be pulling 1154W from the wall 

"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.