There is no reason to do what you want to do, even if you COULD do so.

2560 cores - equates out to a high-end R9, perhaps the R9 290x or 390x but is going to clock lower.

28 nm tech too like those, so power HUNGRY.

I suspect it MIGHT go as high as 25 Mhash/sec on ETH, depends on the memory more than anything else.

Trick is going to be finding the right OpenCL and driver support for it, AMD had a tendance to split out their "workstation" cards into their own drivers series.

Early adopter premium, enjoy it while the rest of the batch is getting delivered.

 Read your own post - no talk about "mining" in there at all.

1080 ti is pretty much across the board higher performance than the 1080 - but it also soaks more power to manage that higher performance, and costs a lot more even at NORMAL pricing.
1080 could sometimes be a little more COST effective when prices were normal.

 1070 ti can be more efficient then either the 1080 or 1080 ti in general, but tends to have lower performance when pushed than the 1080.

I'll believe it when I see it.
Still have seen ZERO proof their announced SHA256 miner actually exists or is being worked on FOR REAL.

Back when TheStilt was writing modded bios for various R9 2xx series cards intended to be used in Scrypt mining, he stated in one post that the Sapphire non-reference cards got the least benefit IF ANY from a modded BIOS because they were already pushing the memory straps pretty close to the max their memory could handle.

Intake and exhaust on the same wall needs a LOT more seperation than I am seeing in that photo from the OP.

Intake low exhaust high works better than the other way around, as it works WITH the natural heat flow of the room.

Intake UPWIND from exhaust should also be kept in mind.



 The crossflow setup from the last couple posts looks viable, similar to some degree to the Gigawatt "hut" things, but you want to push the racks closer to the intakes to avoid having a lot of the airflow just go "over" the racks - or put some sort of flow restriction in along the intake wall at the height of the top of your highest rigs to make the use of the airflow more efficient.
 Depends on how tall the racks are - if they get within a foot or so of the roof, don't worry about it.


 With the kind of airflow you're planning, the color of the container shouldn't matter - might even want it to be dark to reduce ice/snow buildup on top of it in the winter.

 For long life and efficiency.
 Some folks have HIGH electric rates, or limited amount of electric available, and efficiency MATTERS.

 It depends on the PDU - a few are "continuous rated" in which case they will probably be listed as "24 amp", most are not in which case a 30 amp unit should be derated to that 24 amps.

 The drier circuit is ITSELF probably a 30 amp circuit, in which case you would have to derate to 24 amps continuous usage ANYWAY.

 If your rigs eat 1320 watts "at the wall" or less, you should be fine with 4 of them.
 If your voltage at the outlet is higher than 220 volts, you can go proportionally higher on the wattage per rig safely.

 280x is rough ballpark a 300 sol/sec card on equihash as I recall from some of my testing.
 Under 15 Mhash/sec for ETH in the short time I tried it on that.
 Stocks card, BIOS upgrades might have helped some.
 I didn't check power usage, but I would GUESS 150-200 watt ballpark.

 If you are paying over 20 cents/kwh you're in one of the HIGHEST price areas of the US - the NATIONAL average is closer to 12 (I can't remember if it finally went over or is still a little under offhand) and you don't need to be "rural" to get to 5 cents/kwh or a bit under.
 Moses Lake, Wenatchee/East Wenatchee, Ephrata, and Quincy aren't BIG cities, but they're definitely not "rural" - and there's at least one part of the Spokane metro area (the service area of a small electric utility company called MECRO or something like that in the Spokane Valley suburb) that's also under 5 - and that's just the areas I know about personally and talking residential or SMALL business (general service) rates + taxes + fees.

 They're worried about LONG TERM profitability vs short term spike then long term DUMP.

Titans should be a LITTLE faster than the 1080 ti, they have a fully enabled GPU while the 1080 ti uses the same GPU but with one "compute unit" disabled (11 of 12 enabled), 11 GB of RAM instead of 12, on a 352 bit memory bus instead of a 384 bit bus (sensing a trend here yet?).

 The 1080 ti is, for most PRACTICAL purposes prior to the "video out circuitry", 11/12th of a Titan except the normal price.

 The one other MAJOR difference is that ALL "Titans" are basically "Founder's Edition", no aftermarket cooling solutions or aftermarket "base overclock" models - so sometimes a 1080 ti can clock enough higher to beat a Titan on some workloads.

 I can't remember the last time I saw a 280x or 79xx ANYTHING on Craigslist.
 Definitely months, but more likely a year possibly 2.

 Ditto R9 ANYTHING except for one listing for a WAY EXPENSIVE R9 290x at something like $600 a couple months back, and a listing for a pair of R9 290 (not x) around a year back in the $350 each range but I was never able to get in contact with THAT seller.

 Given the Titan V performance, I don't anticipate Volta making ROI significantly longer on Pascal cards - it's looking like a ballpark 20-30% improvement AT MOST, so noticeable but not game-changing.

 It's unmatched on the Nvidia side, but it's not much if any worse than the "Litecoin Craze" days on the AMD side.

 You CAN avoid most of the gouge with patience.
 I almost pulled the trigger on an EVGA 1080 FTW tonight - passed on it due to the "dual 8 pin power" that would not fit into any of my current available GPU positions.
 I've also managed to "pull the trigger" on 4 other GPU purchases in the last month before that, despite generally only checking availability once or twice per day at a limited number of spots.

 I refuse to shop at places that won't honor warrenttee - places like that are AT BEST too bloody shady to trust, and have a fairly high potential to be outright ripoffs.

 PNY can't refuse to honor their guarenttee on cards, unless they want to end up in Federal Court over it - and lose a CHUCK of money and reputation as a result.

The only differences between these cards and the "standard" Titan Xp are:

 1) fancy lighting.
 2) They're AVAILABLE right now where nothing else is in stock in Nvidia's web store.

 That's IT.

The increase in DAG file size, in and of itself, means that you have to do more work for each "hash" on average - this will slowly reduce the hashrate of ANY card.

 So no, the hashrate WON'T stay the same - but it's a very slow decrease.

It's not 10 month ROI if you avoid paying CRAZY GOUGE PRICING.

10 month ROI isn't all that bad anyway - same ballpark most ASIC miners have been in for a long time - and one HECK of a lot better than *ANY* normal investment can manage.

 The past year spoiled a TON of folks with the crazy high returns.