Mixing AMD and NVidia in LINUX is at best a royal PITA, and often just flat out doesn't work.

 I spent about 3 WEEKS trying different things to get the AMD 15.12 drivers and a reasonably current NVidia driver working on one of my A10-7860K based rigs, never did get it all working so finally gave up on the idea.

 That's WHY I'm currently working on shifting cards around as I can, to get them away from mixed-GPU so I can drop Windows in favor of much-more-reliable LINUX for my dedicated mining rigs - it USED to work, but doesn't seem to do so any more on recent driver versions.

There are some reports that trying to overclock the card WITH CURRENT DRIVERS will drop HBM memory speed to about half.

 Trying to run 4 cards with a TDP of AT LEAST 1000 watts on a 1000 watt PS is .... very iffy at best, even if you set the TDP down you're still going to see occasional spikes that are a lot higher.

 Also, not all "1000 watt" supplies are the same, though a plat-rated one SHOULD be at least fairly high quality.

 I've never has ANY of my miners show "reported hashrate" above zero on zpool OR ethmine - never understood how that was supposed to work, and as it doesn't affect shares earned don't really care about it.

 Mining has always been a risk, and a lot of folks have been burnt because they didn't do due diligence.
 I suspect quite a few are in the process of getting burnt RIGHT NOW for that reason, but it depends on how far profitability drops over the next couple months.
 THEIR mistake, I don't feel sorry for them.


 Newegg availability has been VERY spotty, but if you sneak it in right you can sometimes find RX 470/480/570/580 cards there under $260 the last week - usually limited to quantity ONE in a 48 hour period though.


 Nowinstock lags too much IME, by the time they update a card it's usually sold out again.



 Alibaba resembles EBay, but NOT Amazon.

 By the time you add your splitter thing, and everything you need for it, the cost isn't much if any different than just going with a motherboard that is SPECIFICALLY made to handle 6+ cards, and you'll probably see better reliability if you don't use the splitter.

 There WERE AMD AM3/AM3+ based motherboards made that could handle 6-7 cards out of the box - Gigabyte "-UD7" models were very popular during Litecoin GPU days for that reason - but I don't know of any are still in production, and I've never personally used any of them (my go-to board at this time is the ASRock 970 Extreme4, but it only has 5 PCI-E slots and I don't build riser rigs).

 Why do folks insist on recommending a board that has been OUT OF PRODUCTION AND IN VERY SHORT SUPPLY (when you can find them at ALL?) for 2+ years now?


 For reference, Intel stopped making the chipset that board uses ballpark *4* years back.

I made a point of NOT buying massively overpriced cards - and the cards I have bought all have "other uses" planned for them if mining profitability drops too far.

 I suspect it's not going to get much if any worse than last summer though, folks will give up 'cause their high power cost makes it unprofitable for THEM in fairly high quantities long before it becomes unprofitable for ME.

For a non-mining-specific distribution, Ubuntu and it's close varients like Xubuntu get the most support.

 I'm pretty sure most or all of the "mining-specific" distributions are Ubuntu based.

There is NO GPU that is viable to mine LTC with.

 For ETH at recent card pricing, it depends on how much you can get the cards FOR.

 GTX 1070 is a 30 Mh/s card give or take with minor tweeking.
 RX 470/480/570/580 can match that pretty close on the 8GB cards (that use faster memory) but need modded BIOS to do so.

 R9 290/290x/390/390x can also match that, but need modded BIOS to do so and eat ballpark twice the power.


 GTX 1080ti can do 35 or a bit more with minor tweeking, but generally costs a LOT more than the other options - it's a lot better on non-ETH mining.

 GTX 1060 can get into the low 20s, the "6GB" version is a good bit faster as it's NOT the same GPU as the "3GB" version.


 I'm not going to list pricing, as it's been in a state of major flux the last week, AND some cards have been available IN VERY SMALL QUANTITIES for quite a bit less than they were 2 weeks back (the mining-specific versions for the most part).

GPU have not been viable for use in Bitcoin mining for YEARS now, ASIC took over quite a long time back.

There are many ALTcoins that GPUs are viable on, but that's over there where the other folks pointed you to NOT here.

There was a point that $7/day on ZEC was possible - but that was a couple weeks ago when profitability on almost ALL coins peaked.
It's dropped a LOT since then on almost everything.


 RX series cards have been recovering quite a bit on pricing the last week - if you're lucky enough to sneak in an order when someone HAS some at a low price, and usually on the mining-specific cards.

 I managed to snag *ONE* Sapphire RX 470 card out of NewEgg over the last week....

L3+ are almost totally enclosed, but I'm pretty sure they still would fall under the Business-class FCC EM radiation rules (which are less stringent than the home rules).

 Look up "Faraday shield" sometime.


 As far as power to a warehouse - 3 phase normally doesn't get used 'till you're quite a bit over 100 kw - I think the SMALLEST 3-phase service I've ever seen was 480v 300 amp (which works out to be over 140kw PER PHASE and over 400kw total service) though I have vague recollection of a co-worker talking about a 200 amp 3-phase setup he helped install MANY years ago.



 Cooling is going to be an issue - even a big CENTRAL A/C isn't going to keep that many miners cool.

 Central A/C is usually rated in "tons" for historical reasons (appx. heat value one ton of ice melting is the origin of the term) - a "ton" is 6000 BTU/hour, 2000 watts generates a bit MORE than 6000 BTU/hour and it's rare for a HOME central A/C to be rated much more than 6 tons - or about the heat generation of 12 KW which is somewhat less than 10 S9 units use.


 Most folks either use lots of airflow and tolerate running their miners at ambient temp or a bit more, or use lots of airflow with evap cooling (which DOES work fairly well in some parts of Texas).

 I pull in a good bit more than $3/day with my 1070s, even WITH the widespread coin price drops of the last couple weeks - but for what I've been working on most of the last month, the 1080ti is at least comparable on hash/$ at the prices I've paid for both (I didn't pay more than $400 for any of my 1070s, started moving upscale when the price started gouging).
 1070 pricing has started dropping the last week - looks like the "mining specific" card sales is helping SOME to drop pricing back down on the "gouge priced" cards on both sides of the red/green debate.

 Used 980ti go for as much as they do because they OUTPERFORM the 1070 on almost anything (mining is one of the RARE exceptions, and even there it depends on the specific coin), gamers don't worry about having one card that soaks a lot of power and that's STILL the primary market for GPUs.

 If you build the rigs to be reliable, running twice as many rigs isn't that big of a difference - and it's certainly not going to be MORE THAN TWICE AS MANY GTX 1070 rigs to match the performance of GTX 1080ti based rigs (more like 60% more).
 In my particular case, I end up having to build the GTX 1080ti rigs with FEWER CARDS due to limits on my power infrastructure (a 3 card rig would eat 850+ watts at the wall, which means I CAN'T put 2 of them on one circuit), which turns out to be a good thing from a cooling standpoint as well since I don't build riser rigs - so I end up with the SAME number of rigs, with a *HAIR* more performance, using 50% fewer cards and slightly less power (which is where my 60% estimate comes from since most mining rigs ARE riser-based AFAIK).


 On the other hand, the 1080ti is NOT as all-around good as the 1070 at mining - there are coins it's better at, but except for ZEC they are ALL "small hash" "small cap" coins (and even ZEC is a lot smaller than ETH is).
 It IS going to have better resale value at "this past month" pricing than the 1070, since it never went into "gouge pricing" - if you bought (a) 1070(s) at "gouge pricing".

 Pool doesn't specifically reward blocks for DGB-Skein - that was a promotion for something else on one of it's other options for a short while.

 Such a coin should have appeared after the introduction of the Fury line, by your logic.

 However, there is no REAL logic to such a coin concept.

I went double-digit because I got reminded by a post somewhere about "S9 batch shipping in July".

 Seems like Bitmain got this batch out the door a bit early though, I'm pretty sure their "ship by" date on the batch in question was July 10.

 It's just you - we've been in an incredible surge the last 3 months or so, now things have corrected some and there might be a shakeout happening a bit sooner than I expected.
 GPU mining is STILL a ton more profitable than it was last year at this time though.



 Intel, Dell, and HP don't belong on that list. Intel isn't selling many if any HIGH PROFIT CPUs to miners, Dell and HP don't sell systems suited for mining at all.

 Corsair is iffy - not all that many miners that like their power supplies, especially to the large number that talk about using EVGA.

 AMD is without doubt #1 on that list by quite a bit, between GPU chipsets sold AND some extra CPUs sold.


 I don't think Phil is saying "invested" so much as "sales driven up noticeably by sales to miners".

 You seem to be ASSUMING that these settings are the same on every motherboard - and that they EXIST on every motherboard.

I suspect you are going to have to pull the MB out of the case to get a R9 295X2 card to fit on the MB - and you should PLAN to replace the power supply, there is no way HP put on in that machine with enough power to power your GPU.

 Do you already have the GPU itself?