SP20, SP35 and S4 are all NOTHING BURGERS .... I don't think they will ROI. Seriously, do the math and save your money.
Most of you have a mistake in your equations. They are based on wrong precondition - you somewhy think that BTC's exchange ratio will be the same as now. Try to imagine it will be 600$ in one month, when the miner will pay for itself in this case?
Trust in
BTC, otherwise everithing doesn't make sense...
If I listen to you . My move is go to coin base buy 4 btc for about 1700.
The use 2.32 btc to buy a four s-3s' and hold the rest as coin.
BTW anyone that buys an s-4 and does not do this instead really is self destructive.
S3 are NOT currently on sale for 0.58 BTC, and if you want to buy on ebay, it cost ~$330=0.79BTC, so four would cost you 3.16BTC.
BTW 4X330=$1320 and IF you add PSU, it will get close to $1450 and maybe even a few $$ more.
So, where are savings-please don't tell me about coupons because I got none.
here is a listing for 300 + 12 to ship or 312 make an offer for 288 + 12 = 300 he sold them to me for that price.
http://www.ebay.com/itm/Antminer-S3-IN-HAND-Batch-5-SHA-256-Bitcoin-BTC-Miner-FAST-USA-SHIPPING-/161430781873?pt=US_Virtual_Currency&hash=item2596063fb1I happen to get a 39 dollar discount which you say you don't so I paid 261 .
As for counting psu's in the price by now if you do not have multiple spare psu's from mining what were you thinking. Hw many posts have there been about buying an evga 1300 watt psu for as low as 154 after rebate (20 posts) on this psu that runs 3 s-3's. no sale and that psu is 190
So if I want 3 s-3's for 783 and no psu's I can do it.
you don't have a coupon fine you get 3 for 900 and 189 for the evga = 1100
but I can have 3 for 783 so how does the s4 work for me and BTW they now want to add on shipping which means 150 more so the s-4 is 1600 usd for 2th .
That is more expensive then buying ghs from cex.io!!!