Love the 360 beautiful pictures.

I took that one off as the heatsink was already shifting around a bit, good spot on the damage I hadn't seen it. Looking at the ASIC stats thats also the chip reporting perma overheating, so the answer is probably not. The reseating is straight forward due to the type of screw arrangement (sets height and torque) so it may be due to that damage. Its still hashing but is forced by the software to run slow.

Hasn't made a different to the overall hash rate as there's plenty of headroom though.

Density, includes $800 of PSUs, slightly better efficiency, better ambient temperature response, no MOQ and extremely low noise levels (if you can feed it low ambient or underclock a bit).

Input Rating  200 - 240 VAC http://www.spondoolies-tech.com/products/sp35-yukon-power-november-batch-1
As u can see the psu's are not for 110v
SP30 and SP31 do have psu's that accept 110v, SP35 does not!

There seems to be some conflicting information here. If the PSU's are Artesyn DS1600SPE-3, then they can operate on 120V according to that datasheet; they'll just limit themselves to 800W.

Of course that's not enough for hashing, but shouldn't it be sufficient to boot up the controller and web interface? That's what I'm trying to find out: can I power the SP35 on 120V just to configure the pools (no hashing), and then plug it into 220V when ready to mine?

So, just to confirm, will the SP35 boot up at 120V and allow one to change settings (such as pool information) on its web interface? Assume it is not hashing (e.g. not connected to the internet).

If the answer is "yes", can you provide an estimate of the SP35's power draw while in its idle (i.e. non-hashing) state? Again, thanks in advance.

Any update on this?

No problem powering the SP35 at 120VAC.
No problem hashing at that voltage as well but performance will be low due to the 800W limitation.

This was tested (for example, FCC tests were done on 120VAC and 800W).

When not hashing power consumption is very low. the management board consumes less than 10W and the fans can consume up to 65W if running @100%. Fans will only run at this speed until SW is loaded. At this point SW will reduce fan speed and fans consumption will drop to few watts.

Can anyone provide a table or graph of how 'ASIC Voltage Limit' affects power draw and hashrate of the SP35 (the SP31 numbers will do as well)? Spondoolies, do you have that data available?

That would help owners determine the best settings to maximize profit. Those with high electricity costs may find that undervolting provides the highest net profit in today's mining environment.

For example, here are some values I measured for an SP20:

1315GH/s
maximum voltage limit: 0.67V
power: 765W

1250GH
max: 0.66
power: 695W

1200GH
max: 0.65
power: 640W

1137GH
max: 0.64
power: 577W

1085GH
max: 0.63
power: 534W

Cooling kinda depends on what they are in as far as placement I'm unsure what ambiant conditions, place, if evap cooling is possible etc. 

On "towers" if you mean a server rack I would save the money and use something else, unless you find a good deal used.  Just can save a lot of money there.  On internet as long as it is constant yes they do not take much internet speed just needs to be reliable (IE no dropping packets, no downtime, etc).

Hubs again I would see what you can get used if your talking 22 miners that is quite a hub.  If you can find used again save good amount of money.

One thing you don't mention is wiring and PDU's.   Make sure to save money for this.  Also make sure you have enough power 22 sp35's is a LOT of power.