For USA customers ,  ITOP Shop  will Ship locally from NY , thanks.

For sounds I put two of these on top of my S5s so they hang over the fans (push-pull) and they cut down on the sound quite a bit.

http://www.amazon.com/dp/B008Y387B4/ref=rr_xsim_1_2?ie=UTF8&qid=1439388990&sr=0

Will that price include shipping?

If Bitmain is selling direct for $2750, I'd rather go there, ship direct and take my chances with customs.  Your price is too high to yet add shipping on top, if their price does end up as stated.

You can bet his price will be higher !!! . AND NOT INCLUDE SHIPPING .

i could drive to NY it's  maybe a 3 hour drive for me . but i really don't want one even if i could afford it i wouldn't . I was hoping for something  more like the S5 to  use less power and offer more hash . like maybe 700 watts at 2 th.

 Varies some, I've seen a few high-end Gold units lose closer to 2% between those points.


 Miners are not liabilities as long as they can mine at a profit. I'd class them as short-term high depreciation assets, vs, power supplies where a good power supply can be a very long-term asset.

 Given that I anticipate the "in process of showing up" generation of miners to have a high probability of being viable for 4+ years, I doubt that power supplies will outlast 3 generations of miner past the "current showing up" generation on a high-probability bases. Miners are catching up to "state of the art" in the current generation, after a few years of each ASIC generation being well behind the current state of the art for semiconductor manufacture.

 50% to 80% load on MOST gold power supplies is usually less than a 1% drop in efficiency. Seems like the optimal point from a ALL costs basis is around 70-80% ballpark - which is also a good point to be at from a LONG TERM reliability basis.


 In my S5 testing, the efficiency was pretty close to flat vs. clock rate from 300 Mhz to 380ish. The varience seemed to be mostly "measurement tolerance" and a very small contribution from the small efficiency difference in the power supply with varying load level.
 I don't see dropping to 275 being a significant efficiency change.

 POWER usage on the other hand did change with the clock changes, downclocking WOULD drop the total power used appx. in proportion to the clock rate change.

 2TH at 700 watts wouldn't be practical out of an S5 form factor unit, you'd need more chips than you could fit on 3 boards. 1TH at around 350 though I could see happening if Bitmain wanted to do it, 2 strings of 20 chips per board with 3 boards - I'd have to go look up one of my posts in the Gekko BM1384 thread to find the figures I worked out.

But unless you're on free electric, or something totally insane like 1-2 cents/KWH, .9GH/watt is losing money making those S1s a liability. Well, no longer an asset anyway.


 (edit) looks like a dropped a decimal point, that would actually be profitable up to 8-9 cents/KWH at current bitcoin diff and price. Which is still pretty low cost electric though, most of the USA pays at least 10 cents/KWH and I think the average is pushing 13 as of last year.


 I'd hate to try to ROI if the unit wasn't already mostly paid off though. 8-O

It's not "GH/watt" (not sure what that unit would measure), it's 0.9-1.1 J/GH or 0.9-1.1 W/GH/s.

0.9-1.1 J/GH is profitable (barely) up to ~0.10 USD per kWh or so.