That is very good to hear and I think is a first for any BTC miner maker

Will be interesting to see final specs on the new release. Still 14/16nm chips I assume given that the smaller nodes are still more of 'almost there' for the immediate foreseeable future even for the likes of Intel and friends. Not to mention the IMHO there is little practical need for miners to go there for several more years. Re-spin of the current chips for maybe a bit better performance, sure.

Anywho, if the Real World agrees with projected power/speed specs I'll definitely be getting some of the new ones and take a few s9's offline to hold as farm spares. Now have 3 dead s9 boards all from different miners so already took 2 from the latest failure to bring the other 2 back to full speed again.

Hopefully that is as a last gasp now that the fork got dropped on the floor. Guess we need to wait until after Nov 23 to see if it gets picked up and used again... or becomes relegated to just another sha256 altcoin.

Well not quite useless, if reasonably quiet (never had one) could make a decent space heater?

Ah. Ja directly using a transformer meant to deliver 240v would be ideal. Usual problem is the contractor finding a supplier of them.

Ones for 208 are off-the-shelf stock because when used in then normal mixed 208v/120v setup the phase to neutral gives 120v but a 240v transformer gives 168V phase to neutral making it unsuitable for '120v' needs. Since most of your loads are not 120v ya don't care but point is 240v is harder to obtain.

Taps? As in having a voltage regulator using relays to mechanically switch between them to keep a certain range of voltage out? No no no no. The taps are set on the transformers are set only once - when installed. Set them to as close to 220-230v as ya can and yer done.

For same reason typical stand-by UPS's and especially those with AVR suck is that it takes around 10ms or more for the mechanical relays to operate. During that time the PSU's usually drop out forcing a miner restart.

The BX2 hard fork due on the 23rd which those behind it have now said is canceled. Seems to be score 1 for the Good Guys but only after the 23rd will it be fact.

***  Syan miner is a SCAM! If someone buys their miners without any well-known and trusted Forum Users 1st getting one for doing a review and posting it here then well, you have been warned ***
Come back here IF you ever get this Unicorn and can provide proof of its existence.

Until then, you DO realize that a brand-new user with ZERO previous posts stating support of something like this 99.999% of the time = them being either a paid shill, a troll, or just a random idiot right?

a. Learn what crypto coins are, primarily that Bitcoin is a specific coin with very specific hardware needs. The word 'Bitcoin' is not a general term for all crypto coins! BTC can only be mined with a miner made for processing the SHA256 algo and for several years now that means ASIC-based miners.

b. All the other coins fall under the general name of 'altcoins'. There are specific areas for alts here. Use them as altcoin queries are not welcome in Bitcoin areas. More to point of that is that the altcoin ares are where you find folks living/breathing alts so much better chance of answers there.

c. All ASIC-based miners such as the s9, A741, eBit9, and yes even the D3 can ONLY process the coin they were made for. The chips are hard-wired to do one thing and one thing only, that cannot be changed. Period.

Um, already exist from several years ago -- called the Ant S3 series... They too used 28nm chips and while a respin of them to use string topo vs many Vcore bucks may give better specs I doubt would be worth it when so many of the now very cheap old Ants are to be found on eBay et al.

Sigh....
Why oh why is this same damn question asked over and over here?
There are dozens or more threads about this and as the OP said, there is no consensus.

Why?

Because as all the threads state over and over - IT ALL DEPENDS ON YOU!
Your cost of electric, your local temperatures, your comfort with financial risk, etc.

There is NO solid 'Yes' or 'No' answer because conditions are different for everyone.

Read the existing threads and after considering the various bits, make up your own damn mind and accept responsibility for your actions.

The only thing you asked that has a solid answer is about using a pool vs solo mining. No if's and or but's -- use a pool. Only multi-peta hash farms have a chance of somewhat predictable returns when solo mining and even then most use still use pools.

Hash rate does not and cannot change when using 220v vs 110v. Assuming the PSU works correctly, it still only puts out 12vdc and that is all the miner sees. Same DC voltage = same DC current = same operation of miner. Assuming the PSU works with either 110v or 220v and feeding in 220v the wall plug eff is slightly higher but not enough to matter - at best only 0.5% difference.

With the miners drawing between 1,800w and 2,000w do not even try designing the PSU to run on 110V.  Some uninformed customers may ask about it but they do not realize what trying to supply that much power using 110v line means.

In North America standard 110v receptacles are only rated 15A (1,650w). Running higher loads on 110v would require installation of a 25A 110v line and receptacle. If a new receptacle and line are needed, is just easier (and better) to have 220v service installed.

And this ^^^ has officially moved out the the Bitcoin word and is now officially altcoin turf. Answers to altcoin queries are to be found in the <drumroll please> altcoin sections...

I wired 12ga feeding each 20A (L6-20) duplex outlet so to power 2 miners. Using a safe 1,500w per miner @ 208 that gives 7.2A per miner and 14.4A total for 2 miners on the outlet. The 14.4A total keeps outlet and breakers happy and fits well with using 12ga wire. Instead of insisting on 10ga, just have them use higher-temp rated wire like used for can lights, is cheaper than 10ga and allays any concerns about 24x7 loads and wire temp.

If you lose a phase the miners fed from it will drop out. If by relay you mean a mains contactor controlled by a voltage/phase monitor to kiil the power - overkill.

There is no 'writing machine language for ASICs'. The logic structures are 'hard wired' so to speak into the layout of the dies. There is no programming possible. Only a FPGA (Field Programmable Gate Array) is able to be programmed with a fixed logic structure that simulates the hard coding an ASIC uses. Even then they are still far slower than an ASIC.

Got a strong Computer Science background? You will need one for digging in this deep...

If you mean writing micro controller code to talk to the ASICs - follow vrobb's suggestion.

a. Post in the POOLS area....
b. deals mostly with altcoins - post in those sections, not here as this is Bitcoin-only area
c. sounds incredibly scammy to me. Running a pool entails being directly responsible for a fair amount of money changing hands. That means you need detailed knowledge of what is going on behind the curtain. If it even exists a pre-made solution will most likely mine mainly for whoever wrote it with the sucker (you) getting little and worse, probably they will want you to expose wallet keys.

Software mining Monero.
And just how is this a BITCOIN hardware question?
Keep altcoin crap coin things in the altcoin sections.

Methinks folks are talking about 2 very different matters namely, pressure through a miner OR room/building ventilation.

A miner needs high static pressure fans to move the air through them.
Ventilation through a room is entirely different.
OP - which are you confused about?

Look around the Forum, there are at least 5 other current threads on this answering the same damn question!

Wrong area twit - belongs in Marketing.
Also being from a VERY new user -- highly scamming sounding to say the least.
Reported to mods.