Interesting to note that 1720 watts is right up against the power limit for running (2) on a 220V 20amp circuit continuouosly. 

20 amps /2 = 10 amps * 80% max = 8 amps * 220V = 1760Watts.

Nice design point!

Current block is #534630 - thats a long time to wait for a payout...

You might be able to run 2 of the hash board, but it is unlikely to run all 3 (although there are rare reports of people running on 110V).

Its not a matter of voltage, its a matter of current.  Changing your voltage is not going to change the amps you draw out of the dorm room electrical outlet.

You could get a wifi to ethernet adapter, but wifi latencies may fool with your mining results.

What you didn't mention considering:

1)  The noise - An S9 sounds like a vacuum cleaner running full out (and an old noisy one at that)
2)  The heat - watts in = heat out.  So you will be running the equivalent of a space heater full time in your dorm room
3)  Fire hazard - most colleges consider miner fire hazards, since students due stupid things like throw blankets over them during room inspections
4)  Illegal use of school resources.  Anything provided by most colleges used for private profit is generally good for getting kicked out

Bitmain no longer owns the "Most efficient' title, although they still use it.  They are however, the cheapest/TH.

Damm... I need some coffee.  First read of that was "profitable by $2k/wk" - I was like WTF!

Your Legendary status might help.  I lost a lot of stats when I switched userids last November.

Exactly.

Kano - any thoughts?  Bitcointalk is, unfortunately, the "standard" place to be.  But sites like cryptocurrencytalk are a lot more friendly to posters. 

Wrong thermal characteristics, and too cure, the two parts can't be diluted with anything else (except inert cured epoxy dust, which is how they color it).

nope - the thermal paste would totally dilute the super glue and make it ineffective.  Kind of like adding Elmers glue to grease.

FYI - post about Overt ASICBoost on Kano:

https://bitcointalk.org/index.php?topic=4748860.msg42884970#msg42884970

... and post removed by (anonymous) in under and hour.  Text was:

===

KanoPool (https://www.kano.is) added Overt ASICBoost to its pool a few hours ago.

Kano spent quite some time testing this code and removing bugs, some rumored to have prevented earned block payments, from the code multiple pools use to support Overt ASICBoost.

There should be no worries of 400PH miner being paid for months without earning blocks on Kano, unlike speculation elsewhere.  Non ASICBoost miners won't be saddled with supporting those folks either, since on Kano they will pull their own weight.

Come join the best supported pool on earth:  kano.is.  Public port 3333 nodes in New York, London, Germany, Japan, and Singapore, with the default stratum server in Western USA.

You can chat with us on IRC (#kano.is), Discord (KanoPool), or of course, here at Bitcoin talk (where we have the most active thread on all of Bitcoin Talk, much less the pool subforum).

===

Now posted at https://cryptocurrencytalk.com/topic/107802-kanois-adds-overt-asicboost-to-its-pool/

update:  Deleted off the Halong thread as well as "off topic".

Thats only about 650 miners.  Nothing for Bitmain.

Spent some time today checking temps on my miners (easily done with Awesome Miner by just sorting on the Status tab).  Anyhow, out of ~120 S9s I found 5 that were running hotter than the others.  Most had reported chip temps in the 60s-70s.  These 5 were 80+.

My first step was to do what I thought was the obvious thing:  tear them down and blow them out.  That actually helped 3 of them.  The other 2 continued to run warmer than expected.

Opened up the web gui on each and discovered both had one fan only running around 2000-2600 RPM.  Swapped the fans out (with spares I had previously purchased from Bitmain), and goodness returned.

Learning for today:  Just because it boots and passes the BIOS fan test, doesn't mean those fans are running correctly!

Oh, for the record: I started down this journey today because Awesome Miner alerted me that one of the miners hit 96C.  Nice to be notified.  Not good that a miner was running at that temp.  I should also note the intake air temp is 90F (32C) right now.

The APW3+ suck are in on the power plug side and exhaust on the power connector side.  So yeah, for most installations they vent hot air in the direction of the S9 intake fan.  Not a great design.

Keep us posted on how you do.  I'm actually surprised you can get $0.11/kwh (~$90/month) for 5.  I would have thought it would be more expensive.

I use to run (8) in my basement.  What is your local home power cost?

And coorespondingly, each antminer requires its own ethernet port on a switch, ethernet cable, etc.  Not a biggie if you just have a few, significant if you have dozens or more.  Each antimer will also require its own Awesome Miner license (e.g. 1 used per miner), where you can leverage 1 for up to 20 Avalons.

If you bought your miners directly from Bitmain, suggest trying another pool like Slushpool or my favorite: Kano.is.

If you bought from a 3rd party, it sounds like your systems have been hacked.  Did you confirm the new firmware actually took?

I have sporatic outages of my 841s - likely temperature and or internet/power blip related.  Never had one NOT fully recover after a reboot though, unlike the S9s whose hash cards die at the drop of a hat.

When I opened two of mine up, both were CoolMasters.  Nice to see them use name brand fans instead of low-bid ones (my S9s have at least 3 different brands of fans).

Still waiting for a replacement fan for one that is running slow.

Not sure I agree.  Feels more like marketing to me.  Both of my original T9s died within weeks, although their replacements have been stable.

Have also found that process of swapping the power supply allows the boards to cool enough that repowering will sometimes bring them up.  Multiple experiences where I thought it was the power supply, but it was actually just the few minutes of downtime.

Not if the firmware has been replaced.