Spondoolies would be the SP31/35 for a rack-mount unit, which will exceed your target hashrate IIRC in a single unit (I think they were 4u).

 Nobody currently makes a rack-mount miner AFAIK - so you probably would have to go with a rack-mounted shelf setup.

 The only miner I am aware of that used more than one PS in the unit was the Spondoolies SP50, but those are bloody rare HUGE (11 u or some such) and may not have ever actually been sold (though I remember Spondoolies stating that a few had been BUILT, they seem to have kept them for "internal" usage after they got bought out).

 Antminer S3 units would probably also fit your bill, but I'm pretty sure it would take 2 or 3 of them to get to 2TH.
 

 BIP148 was supposed to split the chain - but seems to be turning into mostly a NONevent, as it's had pretty close to ZERO effect on Bitcoin network hashrate.

 The only effect was that the FUD surrounding it seems to have caused Bitcoin PRICE to drop for a while (though the reported "exchange got hacked" might have been a bigger factor), and indirectly hurt the prices of many altcoins.

 Technically 2 batches sold on the D3 so far, but the second batch seems to have been tiny, or "leftovers" from the first batch.


 As far as X11 difficulty goes - keep in mind that there ARE other miner companies building and shipping units NOT just Bitmain.

 Baikal for sure when they have stuff TO sell and ship (right now they are "out of stock" on everything but "the Giant").

 iBeLink is supposed to be shipping their new 10+ Ghash unit, and may have started shipping it a week or two back.

 It doesn't matter what Nicehash does with your hashrate - they're a market, you will get paid whatever the market is offering for that hashrate no matter where the "buyer" points the hashrate.

 It depends.

 A lot of the time on the 1070 and 1060 ETH is marginally more profitable, a lot of the time ZEC is - but they are usually very close on profitability ON THOSE TWO CARD MODELS.

 1080 and 1080ti, ZEC wins hands down because those cards aren't good ETH mining cards but ARE good ZEC mining cards.

 Seems like BIP148 is a resounding NONevent - which I seem to recall predicting in a thread or two somewhere 2-3 weeks back or so.

 Add Namecoin to that list, among ballpark a dozen more I think.

 Possibly the new BitCoinCash coin, but I want to see if that has ANY staying power before I recommend getting involved in it.

At this point, for your budget, your only good choice is to wait for the next batch of Antminer D3 units to go on sale and grab one FAST when they do.

 I can't recommend Baikal at this point, they're too far behind the current generation.
 iBelink and Innosilicon are out of your price range, and there is some question if iBelink will bother TRYING to bring a second batch to market now that the competition is blowing them out of the water AGAIN.

Multiple GPU rigs with no worker name set up.

 They likely are using local monitoring software to keep track of their miners as opposed to relying on the pool to do so - in which case they're NOT a dumbass.

 If the rigs are all using same or similar cards, the difficulty thing is not an issue.


 If I pointed everything I have that CAN mine ETH at ETH right now, I could get over 1 Ghash - and I'm a SMALL miner by pro standards with quite a few cards that are NOT optimal for ETH and some older ones that can't mine it at all.

 Fixed your reply.

 9-)

 With the Alex78 fork, yes.

 They do well on DGB-Groetsl too though, but the truvot (sp) fork seems to work better there.

 True to a real degree on the basic design, but AMD supposedly HAS done some significant tweeking to the "under the hood" design - more than just a "die shrink".

 The similarity however is real, the core of both is still the "designed around HBM" for all of it's pluses and minuses.

 But it's a TON higher than it was up to the bit price runup, despite the recent hashrate/diff jumps.

 I came VERY close to shutting down my A2 units late last winter because they were very marginal on profitability DESPITE my low electric cost, and I was contemplating adding "more efficient" rigs in their place.
 Right now, they're bloody near my MOST profitable current rigs (though keep in mind I don't build riser-GPU rigs so all my GPU rigs are 3-card).

 They also cost me ballpark HALF what most of my recent GPU rigs have cost me, and are long since paid off....


 X11 total network hashrate IIRC is quite a bit lower as a "number of D3 units" basis than Scrypt is on a "number of L3+ or A4 units" basis - it'll probably be longer before Scrypt profitability drops to "last year" levels for an L3+ then it will be for a D3, especially with *3* folks making big X11 units now (and who knows what Baikal will come up with to replace their current chip with).

 One kicker in the deck - BW.COM and their Scrypt miner, which is CLAIMED to be 28nm therefore quite a bit cheaper to design and make than 14/16nm that the L3+ and A4 seems to be based on, AND a lot easier to get chips for.
 If BW.COM starts making and/or selling a serious number of THOSE miners, all bets are off.

 Scary part - it's specs are better than the A4 and VERY CLOSE on efficiency AND hashrate to the L3+.
 Perhaps THIS unit is why Bitmain cut L3+ pricing?


 On the other hand, BW.COM had announced plans at one point to sell their Bitcoin miners, then ended up either not doing so or ONLY selling them in bulk to large farms.....

 Pretty much HAS to be the Frontier Edition, as the gaming cards aren't available 'till August 14.

 Doesn't look like the gaming card specs are a lot different from the FE though except the price (and in a couple cases the TDP) will be a lot lower.


 There is at least one Gridcoin-related project that is going to LOVE the Vega cards - they should kick some serious keyrates out on the DNet/Moo Wrapper/BOINC project.
 My best estimate based on published specs is that the Vega 64 varients WILL beat the GTX 1080ti or the Titan on that project, and the Vega 56 should easily be in GTX 1080 territory and might be close to the GTX 1080ti.
 This is the same project that the Fury/X/Nano are STILL right close to the top on despite their age....

 On the other hand, that doesn't mean Vega is that good across the board - that particular project has always loved the high core count of AMD cards....

 Not seeing any significant effect so far - seems like BIP148 isn't very popular among miners, but it's early hours yet, that could change over the next few days.

 Quite a few folks in Argentina speak English or German, as I understand it - lot of immigration "back in the day" from both of those countries and quite a few Irish.
 

 None of my machines that mine BURST use a GPU - it makes for something useful for your CPU to do while the GPUs are mining something else.

Probably a bit over a month - EVGA usually has a "surge" early in the month as some folks there earn their "bucks" then turn the rig(s) to doing other stuff.

 Per KNC's stated specs, they appear to have *supposedly* been designed to run at 80 Mhs - like the A2 was "base clock" at 1000, but if you upgraded the OEM power supply they have proven to be rock solid reliable at 1200 (the OEM power supply was only rated for 1100 watts, which is comfortable at 1000 Mhs clock but VERY marginal at 1100 and NOT ENOUGH at 1200).

 The PCI-E connectors even at the 60 Mhs level were very marginal for the power draw, though not much worse than the Spondoolies SP20 (which was NOT notorious for flames as it had power limiting in the controller).

 A LOT of the reported fails were on machines that the user had NOT done any form of "modifications" to.

 A2s are quite comfortable running in high ambient temps in "turbo mode", they have some SERIOUS airflow through the cases and lots of heatsink for the design power dissipation (though the 2 fans in the rear of the case were a waste, nice to unplug them to have around as spares though).

 Compared to the A2, the Titan was JUNK on reliability (except the A2 original power supply if you pushed it too hard), mostly due to BAD DESIGN DECISIONS that required folks to run them WAY too hard to meet their stated hashrate spec.


 This also wasn't new for KNC - at least 2 of their SHA256 miners had the same sort of issues, the Neptune might have even been WORSE on the same points.

The -35- version is also listed on NewEgg, but is "out of stock" as usual for any RX 470/480/570/580 card that isn't WAY overpriced.
 Newegg also lists a RX 570 based version.

 The "no connectors" and open mount plate makes this a better card from a cooling standpoint than any other option I've seen (even in a CASE they should cool a little better than most blower-type cards), but the resale value is definitely not going to be good.

 There ARE good usages for this card other than mining though, so you don't have to be "stupid" to buy one - they'd work FINE in a crossfire or a dual-card DirectX 12 setup, for a couple of examples.
 If you don't PLAN to resell the cards, they're a very GOOD deal right now.

 The real POINT right now though is that they're quite a bit less expensive than "standard" comparable Nitro models or pretty much ANY other RX 470/480/570/580 card.

 Keep in mind that the posted hashrates seem to be STOCK - not modded BIOS.
 Comparing them to BIOS MODDED card hashrates and power usage isn't a fair comparison.