Full Disclosure: Spondoolies Tech (http://www.spondoolies-tech.com/) sent me an SP20 as part of their “Legendaries Review” promotion (https://bitcointalk.org/index.php?topic=887807.0) - This is my independent review.

Background: I’ve been involved in home mining in since May of 2011. CPU mined my first block as a curiosity in August of 2010.

Started with a dual AMD 7970 rig in 2011 and grew my farm out from there after learning of the Bitcointalk forums. Have been practically living in the Hardware section ever since, trying to keep up with the shifting landscape of mining hardware suitable for use in North American homes running on standard 115VAC residential circuits.

My farm today: I’m practically at the limits of what my home is able to reasonably power, which gives me an approximate hash rate of about 11THs spread across Bitmain S2’s, Bitmain S3’s, a few A1 clones, and a couple aging 500GHs Bitfury rigs.

The issue I’m presently facing is that many of the 1THs class miners draw ~1KW at the wall, which means I don’t have enough headroom to safely add an S3 onto that circuit.

I can safely run 3 S3’s on a single circuit which net me ~1.32THs, A 1TH class device on a single circuit, or a mix of S3’s and Bitfuries.

Enter the SP20: The SP20 immediately drew my attention because of its amazing ability to undervolt and underclock. The goal was to downclock an SP20 and having it running alongside an S3, with the aim of getting ~1.7THs under 1200W across the two devices.

phillipma1957 has an excellent thread (https://bitcointalk.org/index.php?topic=872014.0) outlining steps for underclocking your device to ~1.3TH/s here at near 750W that just beats out Bitmain as one of the most efficient and cost-effective, readily available home miners today. I used this guide to configure the system.

My undervolted SP20 running for almost a day now. Shut it down a few times for tweaking and moving it around for pictures.


Getting Started: The initial idea was to replace a very quiet Bitfury rig I have chugging along in our bedroom at 500GHs. It is, for all intents and purposes, whisper quiet and does not appreciably add noise to the ambience of your room, such that it prevents you from going to sleep, or is loud over a television.

Setup: I don’t much like to RTFM, so I stumbled through the usual methods to identify the device.

1)   Changed my laptop to a 192.168.1.0/24 address and portscanned the network for anything. Nope. Nothing except muh lappy.
2)   Plugged back into my network and tried DHCP. Scanned my network and saw an unknown device with ports 22, 80, and 443 open. That was it. Logged in via web interface with user admin password admin.
3)   Set up the voltage, set up the pool information, and off I went.

After the fact, I discovered that, out-of-the-box, the SP20’s report back to Spondoolies via a handy website at myminer.io, that allows you to easily configure your machine.

Official setup instructions are available here:

https://cdn.shopify.com/s/files/1/0389/3233/files/SP20_Jackson_Quick_Start_Guide.pdf?4248

Main screen turn on: Running the SP20 at 40% fans (The lowest available through the menus) runs at ~81dbA. WAY too loud for a bedroom to sleep in, so off it went into a spare bedroom that had an S3 and a Bitfury 500GHs rig still running.



3 Bitmain S3's and an SP20 - Amazing to know the SP20 is more efficient than the 3 S3's combined !


Changing of the Guard - Bye bye 500GHs Bitfury rig. Hello SP20 - Both the S3 and the SP20 are pulling ~1150W at the wall for ~1.7THs.


Some measurements


Some more measurements


Conclusion: The SP20 is the most efficient and powerful piece of mining gear I have ever used, that comfortably runs on standard North American residential circuits.

Given the choice of purchasing 3 S3’s vs a single SP20, the choice is clear that the SP20 is the winner. In closing, it’s awfully tempting to pull the trigger and buying a bunch more SP20’s to replace less efficient A1’s and S2's.

Thanks again to the Spondoolies team for this awesome promotion, and allowing some of us to review their units. I'm very glad to see they have not forgotten about hobby/home miners, and I look forward to their next product offering geared towards us !

The SP20's are available for purchase here, currently priced at $659 USD. http://www.spondoolies-tech.com/products/holiday-special-sp20-jackson-shipping-from-stock

Master list of reviews as part of this promotion follow.

1) https://bitcointalk.org/index.php?topic=895085.0  spiccioli
2) https://bitcointalk.org/index.php?topic=895798.0   Xian01  
3) https://bitcointalk.org/index.php?topic=896161.0   johnyj
4) https://bitcointalk.org/index.php?topic=896065.0   Mushroomized
5) https://bitcointalk.org/index.php?topic=896004.0  John (John K.)
6) https://bitcointalk.org/index.php?topic=896134.0  SaltySpitoon
7) https://bitcointalk.org/index.php?topic=896656.0   notlist3d  
8.) https://bitcointalk.org/index.php?topic=896910.0  THE JOINT
9)  https://bitcointalk.org/index.php?topic=897151.0  Dabs
10) https://bitcointalk.org/index.php?topic=896913.0 Syke
11) https://bitcointalk.org/index.php?topic=900307.0 goxed
12) https://bitcointalk.org/index.php?topic=898952.0 blazedout419

Yep, official review forthcoming. Posting initial results here in the meantime while putting it through it's paces.

Got mine up and running in low power mode thanks to philipma1957's excellent thread here.

https://bitcointalk.org/index.php?topic=872014.0

Had to run a port scanner on my subnet to locate it's DHCP lease - Located an unknown system with ports 22, 80 and 443 open.

Log in with user admin, password admin.

At 40% fan, it was measuring ~80dbA with my American Recorder Technologies SPL-8810 level meter. Too loud to run in a bedroom, so moved it upstairs to replace a Bitfury rig I still had chugging away at 500GH/S.

It's sitting on a circuit with an S3, and both of them combined are pulling ~1150W at the wall.

More later.

Pardon ? How does 8.6 TH/s net you 10BTC in one week ?!

My package was just delivered. Have not had a chance to take it out of the box or examine it yet. Will get around to it later this evening.

Thanks Spondoolies !

Arizona Ice Tea Arnold Palmer. Again.

Not sure if this has been posted yet, but every time I think about "free energy", this commercial comes to mind.

"Flying Horse - Gatorrada" :: https://www.youtube.com/watch?v=Z8yW5cyXXRc

Grats FC ! Nice specs !

Is a Corsair AX-1200 adequate to safely drive an SP20, or would I be better served by purchasing a beefier 1300W power supply ?

Thank you very much, Guy ! Looking forward to receiving a unit !

Arizona Ice Tea Arnold Palmer

... and Gear VR should be in people's hands now.

Just ranked 6th place playing Anshar Wars Swivel chair is a must !

Would be awesome if someone could whip up a Blockchain visualization tool for VR; navigating the blockchain using an interface inspired by Darknet.

PM'd. Not sure if there are any spots left, but interested in one of these. Don't have any Spondoolies in my farm... yet...

Using the "EXIF Viewer" extension for Chrome.

As a security concern, I just wanted to make you aware that Bob's EXIF data is available along with GPS coordinates of where that photo was taken.

Recognizing this is posted in the Off-Topic section, just wanted to interject that your gender should not matter at all here. I would consider gender discussion as an exploitation attempt method in the context of these forums.

I self identify as meat-popsicle, so all you "boys" and "girls" make me chuckle with this back-and-forth gender nonsense in this thread.

Reading through the news this morning, this article caught my eye, and reminded me about these forums' favorite furry

http://www.chicagotribune.com/news/local/breaking/chi-19-hospitalized-thousands-evacuated-in-gas-leak-at-rosemont-hotel-20141207-story.html

"Several thousand people were evacuated from a Hyatt hotel in suburban Rosemont when an “intentional” chlorine gas leak at a convention led to 19 people being hospitalized early Sunday morning.
...
Technicians decontaminated the area and after conducting several tests deemed the area safe within about two hours. People were allowed back into the building around 3:30 a.m. Some conventiongoers, some of whom were dressed up as animal characters, stood outside of the building. Hundreds more were escaping the chilly weather at other buildings.

The annual weekendlong convention, which celebrates art, literature and performance based around anthropomorphic animals, draws thousands of people every year, according to the Midwest FurFest website."

At a budget of a million dollars, paying out $100k per month for four programmers, I would certainly hope the new software is well beyond "very great".

Fight the good fight.

God Bless.