Bitcoin Forum

Edit/Update February 20th at 5:07 Mountain Time.

Here's a link
 (http://www.youtube.com/watch?v=IyBQlj0nP7E) to the video I finally got done. Sorry again for taking so long. I'll talk about that a bit in a minute.

Right now, and you'll need to watch the video to see how the pool setup page is, I have a technical question. How the hell do I set up for solo mining with this beast? I want to take a stab at a couple of SHA-256 alts, for fun, profit, and your viewing pleasure. If possible without taking the thing apart and running the boards individually with Hexminer.

As to how long this is taking, I again apologize. My personal situation is ugly. My wife, as of six hours ago, is hospitalized for probably a week. I have a newborn daughter and a seven year old son, and more stress than I can really deal with. I have been a bit snippy with some people on the forum where I try to be measured. If I stepped on any toes, I'm sorry. Due to the constant medical issues, I have had to take a leave from my job to care for my children and wife. For the moment, this miner is my sole source of income. That's not much. Obviously unsustainable, and I'm working on fixing that ASAP, which leaves me little time for keeping current on this, and little incentive to take it off of Eligius, where it's making me something every couple of days. I do believe I can probably do better by mining alts and trading them, but that's a bit difficult right now.

If the above sounds like whining, I'm not prepared to deny the charge. It's been rough. I'll shut up now. The miner works good, at least :)

Yesterday, AMT was supposed to start delivering the Coincraft based miners. To my knowledge, no one has received tracking info on that yet. I have been very upbeat about this company, because they were good to me and because I like the machine. But if there are no tracking numbers out in the wild in the next couple of days, I'm going to be very disillusioned. AMT, I know you read this thread. Please come through, here. I want you to succeed. But you told me that you wanted me to be objective, and objectively you're not doing so good. Make it right for you paying customers. Even though some of them have gone off the deep end, it's still the right thing to do.

As an aside on that, AMT's business partners in Switzerland are cutting off their own balls with their continued stalling and silence. Come on, vendors, TALK TO YOUR CUSTOMERS. Even when you fuck up. Even when it's bad news. If they are informed and kept in the loop, most will forgive. You can't please everyone, that's an impossible task. But you can keep most of 'em happy by just being honest and informative. Most of us know that shit happens when you're working with bleeding edge technology. Tell us about that shit happening, and you save yourselves ten pages of FUD, easy.
--------------------------------------------------------------------------


ok, the thing has now been hashing nearly continuously for a bit over a month, totally reliably as near as I can tell. I'm still working on a video. Lots of personal problems at this end.

The "sweet spot" for voltage appears to be 895mv for me. I've gone up and down from that, and got lower average hashrate both ways. It seems to average 83 GH/s local, and around 81 at the pool.

I hope to make a video detailing all the features that I understand (sceenshots and whatnot) later this evening.

My overall impression remains very good. If the quality of this machine is an indicator, AMT is the real deal. They do need to improve their customer relations, but that is true of just about every ASIC company out there, with the possible exception of Bitmain. I want more of these. And bigger :)


http://eligius.st/~wizkid057/newstats/userstats.php/1Eu1iqrQW2P6fSPLpGXLXiZ4828BnXpRJi (http://eligius.st/~wizkid057/newstats/userstats.php/1Eu1iqrQW2P6fSPLpGXLXiZ4828BnXpRJi) changed clients, so changed address :)



update From here on out I'm going to put any new news or changes to the top of the page, and put in a reply that says OP updated. For those of you into conspiracy theories, get out them screen grabbers! (I will probably delete and reformat as I go along)

This is just a minor update. I've been running the thing on two pools, primarily Eligius, but briefly on BTCguild. Made better money on Eligius, and I really like Whizkid, so I think it unlikely that I'll do much more if any pool exploration while I only have the one machine.

I've done some playing with the voltages, and I get weird results. If I leave it at 900mv, the setting it was delivered with, it is very steady at just above 80 gh/s. If I up the voltage, I get runs where it approaches 90 GH/s, but it's all over the map. Now the weird part. I've been averaging about 83 GH/s with it set to 890mv. I'll tweak a bit further, but so far undervolting has given me better results than overvolting. The "chip frequency" is set to 540, and I haven't touched it. I don't know what it does. Any insights would be helpful on that. I'm going to try dropping the voltage a bit more next, and see where that leads.

Also, while hashing on the guild, Cgminer kept showing four modules with two disabled. A hard reset (power off) put it back, but reboot didn't. Didn't seem to harm anything, and it didn't do it on Eligius. I don't get that. It has two modules. As I said, it's weird, not traumatic. As far as I could tell, it didn't affect the hashrate in any way, it just looked odd.

Money is tight as hell right now, so I'm not tearing the thing down until after the first week in february. When I do, I'll take pictures of every component and post them up in this thread. I may put it in a different case, as I have a good sized one laying around. Then again, I might not :)


Ok, guys, here it is.

This is a first impressions post of the AMT 80 GH/s miner. It arrived yesterday (1/7/14) at about 6 pm. I wasn't here, so it remained in the box. I posted a video of the unboxing on youtube. I'll edit this post with the link in a bit.

First impression is the thing is bloody small. Then again, it's not very power hungry, so this doesn't seem to be an issue. It's very nice looking in a plain sort of way. I'm a bit of a minimalist anyway, so that appeals to me.

It has an actual powerswitch on the back of the PSU, instead of a softswitch. This too appeals to me.

Enough of that, Kevin, does it hash?

Well, yes, it does. Jim had sent me an email saying to call him to talk me through setup (which I'm still gonna do, since My bashing didn't learn me everything), but I got that email after midnight so I took a stab at it myself.

Bear in mind that I am a noob in the extreme. I've read a lot about these devices, but this is the first one I've ever seen, let alone used. I had to do some research in how to use putty and the like, but I got in, and I figured out how to set up the built in version of cgminer for Eligius. Got that going just a bit ago, and it's happily hashing away.

Here's a link for that, for tonight at least. I intend to experiment with solo mining alt coins in the near future, but right now I don't know what I'm doing well enough to even attempt it.

http://eligius.st/~wizkid057/newstats/userstats.php/1NAivofNXdKhzPvigtWLWMWxYT64huQ8Q (http://eligius.st/~wizkid057/newstats/userstats.php/1NAivofNXdKhzPvigtWLWMWxYT64huQ8Q)

It's hashing around 85 GH/s, so a bit better than advertised. So far my only complaint, and this may not even apply to the units being shipped to real customers, is the lack of documentation. I know very little about linux, so I had to do some searching to figure out how to get into the thing. But I DID do it. The miner works good right out of the box. I suspect that I mined a bit to AMT's account while I was figuring it out, and they're welcome to it.

I'm going to leave it hashing on Eligius for a while, while I sleep at least, and after I talk to the AMT guys and have a better idea what I'm doing, I'll start pushing it's limits. I'll also post video and screenshots for future sessions.

If AMT can deliver these in bulk, I think they are a good entry level miner, and if the big ones work as easily as this one, this is a winning company. They lack polish, but so far I love this machine.

Also, this is a self moderated thread. I'm not into deleting stuff, but if it gets out of hand I will. That being said, I have thick skin and I like to debate, so don't hesitate just because of this. I figured a divergent thread was probably appropriate as things get lost in the noise on the official AMT thread as it is.

Oh, there were some questions asked of me in the other thread.

It is a pair of Technobit HEX16B hashing modules. I haven't popped the case open yet, but I think the on board computer is a raspberry pi. As near as I can tell it's intended to be a standalone unit, but I'm not sure I have it configured properly for that. Not sure I don't either. I'm watching Cgminer in a Putty window. I'll probably shut that down and watch my Eligius page to see if it's still going on it's own in a little bit. I'll update y'all on that.

It runs very quiet. I can hear the fan, but it's not screaming. The case is barely warm to the touch and it's been running for a couple of hours now.

Can't think of anything else right now. Feel free to ask me anything. I'll answer all but the most personal questions as best I can.

Kevin Biomech

EDIT

Puppet is correct, I was sent this unit to evaluate it. I split this off from the main AMT thread, and failed to note that in this thread. No concealment intended. Just an oversight. As the shipping delays, I don't have any knowledge as to what's going on there. Those that say they can't get hold of AMT puzzle me, as I've yet to have any problem, either by email or phone.

EDIT2: Here's the link to the unboxing video. http://www.youtube.com/watch?v=Z-kA5avsZBI&feature=youtu.be (http://www.youtube.com/watch?v=Z-kA5avsZBI&feature=youtu.be)

tl;dr - is this a bitfury based miner?

I think a disclosure is needed in your post. Those that followed the AMT thread will know, but others may not, that you were sent this miner for free by AMT in an attempt to prove their legitimacy.  I think its also reasonable to mention that while you received your demo miner, actual paying customers still seem to be waiting for theirs for 6+ weeks now.

As for the machine itself, if you happen to have a kill-a-watt, Im sure many people would be interested in the results. AMT website claims 80W, Im curious if thats true.

You are correct, I intended to. Oops. Will fix it in a moment.

I don't currently have a Kill-a-watt. My Dad might.

tl;dr is a lot of what's wrong with modern society. But I'll humour you.

It's a bitfury system, Technobit HEX16B hashing modules times two.

I hope he does. Im taking bets its consuming well over 80W. Probably 100-120W.

Surprisingly for a retired electrician, he doesn't. I'll beg, borrow, or buy one before this is all done. I'm curious myself. It's a 300W PSU, which is sufficient overkill to run efficient. We'll see.

We appreciate the attempt at the video, it was a total failure however. (was it a 8mm movie camera from 1947?)


Look forward to more info and some nice clear pictures.

:D might as well have been. Old webcam. My good one got lost in the move. It'll show up eventually. Plus my son does not have a steady hand and he REALLY wanted in on that. I'll have better pix later.

I would also be interested in a closeup of the original label on the PSU if its still present.

As for efficiency; you may be surprised but most PSU's are less efficient when they are only lightly loaded. So the higher the capacity of your PSU, for a given power draw, the less efficient it will likely be. To be fair, its not easy to find <300W ATX PSU's and some models do well even at very light loads, but unless AMT found one that is > 100% efficient, I highly doubt they will achieve their claimed 80W at the wall. Most reports Ive seen suggest each of the two Technobit boards will consume over 40W by themselves if hashing over 40GH. Add to that the fans, USB hub, Raspberry controller (?) and PSU inefficiency, and well, you do tend to end up with more than 2x40W :).

Few people will really care about this in a "80"W miner, but it may provide more insight in how honest AMT is specing their gear.

So very true.


That's only true in few cases, usually 10% or less than the max capable load, sometimes more than that if the power rating isn't really good. In most cases you'll exceed that threshold, at which point the efficiency is almost always linear.

Subscribed to the thread.

So is this thing available now? Ready to ship? At what price? The first post of the supposedly official thread has been blanked out.

-MarkM-

my question is how does a member with similar stats to me get an eval unit?
I believe I even have some rep here, I missed the boat I suppose.

He moaned since God was a cowboy about how godawful broke he was and how desperate he was for an ASIC, any ASIC...

Congrats cowboy, nice that someone came through for you. :)

Next challenge: get a cycle maker to send you an evaluation mountain-bike... ;)

-MarkM-

Certainly no need to be offensive towards the man. What did he do other than accept a miner that was given to him (Would you not?). He was even kind enough to post videos and reviews. How about some positivity - instead of your obtrusive and offensive comments (especially from a senior member such as yourself). This whole forum really has turned into a giant flame-fest.

Thank you for taking the time to post your thoughts and videos Biomech. Anxious to read more about it!

~Chazaki

yes, good point. thx to OP for the review and videos. appreciated!

I didn't find this particularly offensive, please try harder.   ;)

Sorry,

orrible review.

4 minutes to open the box is not interesting.  ::)

When ya figure it out, let me know. Wish I could work the magic again. Maybe it was just time for SOMETHING to go my way.

Or maybe it's this.


That makes the second guy to tell me it's the hat. I'm going with it. From now on it's my official "Bitcoin Stetson"  :D

Thanks, but I think Mark was just being funny. I took it that way. We've interacted before, on the KNC thread. He's cool.

Patience. I'll be doing a hell of a lot more. With far better video/snapshots too. My son really wanted to help. His help is a bit shaky, he's only 7 :)

I figured it would satisfy him and show the world that I actually got the thing.

In unrelated news, but relevant to why I'm taking my time, My daughter is due to be born in a few days. That likely will take precedence over filming and editing.

My 7 year old son hates BTC\LTC because I keep on re purposing his Minecraft rigs. Bought an AIO desktop over the holidays to solve that problem :) Great to see you getting your son involved in the tech :D

Congratulations!  I have a daughter due in April.  Take a break for a few days, but please, obtain and post the watt usage beforehand if possible!

Biomech, Thanks for taking the time to do this.

Bio, if you need a killowatt meter, put one in your amazon wishlist and I'll buy it for you.

Congratulations. Your review is fine and certainly thorough enough. I particularly liked the included link to your Eligius page (p.s. if you haven't already sign up for the nmc merged mining, its not much but a little extra cash for no extra effort is nice). I first started using Eligius when the pool was at about 1TH I think. Shocking to see how it has grown. When my 1.2TH unit comes in it will be less that 0.1% of the pool ROFL. Welcome to the fun world of bitcoin mining and the 24/7 hamster wheel of upgrades.

<<Full disclosure 1) I am a customer of AMT (but have yet to receiver equipment 2) Biomech and I have been conversing  privately for a few weeks>>

Great idea. Thank you for offering to do this for him.

:)

Same here, good effort, lets hope the next gen is relatively easy enough to operate as the Bitfury units.

Although I'm interested in how the low/normal and turbo power modes work in terms of power draw at the wall.

Well, thank you! I will do that. I'll PM you in a little bit.

Biomech, great job so far. i dont mean to jump ahead on the forum, but could you tell us what the outputs on the system you have are? USB? ethernet? just curious because some of the pics of the miners on the AMT website show what looks like multiple USB plugs. the pics on the website dont look much like the one from the video.
its cool how excited your kid is. i have 2 teenagers and one is headed to LSU next year and is only now interested in mining once he figured that he will have free electricity and internet in the dorm. the younger one just hopes i dont turn his computer into a miner like it did with his brothers  ;D

It has two USB ports on the front, which I'm not sure what they're for. It also has an ethernet cable out the back, which is what it's connected to my router with.

Hi,

now that it seems you have 5 minutes to reply to posts , please take 1 minute to take photos (better a video) when we can see how good works your new miner.

Thanks in advance  :)

Coming soon. Probably tomorrow, maybe later tonight. Pics, I mean. The next video will be edited and somewhat less Charlie Foxtrot :)

Found the whole thing charming, AMT prolly could have not chosen better PR person. Stick with it, and I would like to see a Big Ol' Gold $Bitcoin symbol hung on that hat... Yup lucky man he was....

Not kidding mean it..

Well, if they offered me the job I'd seriously consider it. I like the machine.

As for the bitcoin symbol on my Stetson? I just might. But not till I can afford real gold. I like the idea.

Ok, folks. I worked like 19 hours or something like that in the last two days, with hospital visits in between. I actually have time right now, but I am too fuckin' braindead to take a decent pic. Tomorrow evening I will pop the cover and take some pics and post them up here.

As previously noted, Vesperwillow offered me a Kill-a-watt, and it's supposed to arrive just about when I go on leave this coming weekend, so when I get it, I'll do the deed and post pics of that as well.

G'night.

My wife is apparently in labor. All bets are off on the timeline. See you when I see you.

Hahaha tell your wife to hold it in!!


 But seriously congratulations in advance on your new child!

God Bless!!

Sounds like at least someone might be delivering early :p

LOL, quote of the week right thur.

A nice review.
Your son is doing a great job for his age. 8)
Can you post more pictures and video.
I mean better quality.

FYI, they found out what causes that!

Hahahahahhaaaaaaaa.... aw man....

Do they actually have the merged mining up and running?  I tried using it but every time I went back to my 'homepage' it would reset.

Works for me. You have to go into your page and create a signed message with your merged mining details

Seconded! Name your son/daughter 'Asic'.

Well, my wife already calls her "little bitcoin"....

She hasn't come yet. The labor subsided, and we are on "watch and wait" mode. I'm not a patient man, and my wife makes me look like one. This ain't easy :P

I'm gonna shoot some pix here very shortly, plus I now possess a Kill-A-Watt (thanks Vesperwillow!). If starting a project don't bring on full labor, I don't know what will.

Meanwhile, the miner continues to hum away right about it's rated hashrate. Eligius shows it all over the line, Cgminer pretty steady at just above 80. Seems to average around 81 on Eligius. I'm going to try some other pools as time goes by.

Any opinions on:
Bitparking
Bitminter
eclipse never mind, it's Inaba's.
Ghash.io
?

Also, beginning next month I'm gonna have a go at solo mining an alt or two.

Hah, another delay!

:)

Bitparking, no idea, do they still exist?
Bitminter, three thumbs up, highly recommended.
ghash.io, good pool, but please dont, they already have far too much control

True, but the "official release date" is the 18th... (grimace)

Bitparking still exists, but I don't know much about their recent activity. They were the first pool I ever mined on, with a laptop GPU :P Didn't make shit. But I wouldn't have anywhere else either. I was just learning.

Be back shortly with some pix.

I like slush's pool, pretty stable.

http://kevinbiomech.imgur.com/all/ (http://kevinbiomech.imgur.com/all/)

Pix. There will be more.
https://i.imgur.com/2tzGKJn.jpg

https://i.imgur.com/5ZmEPGh.jpg

is that board just flopping around or secured in the case in the first pic??

Almost looks like the cat5 cable goes in that black plug above it, and that there's a cover off.

It's secured. Sits at a weird angle. All the boards are mounted at angles. I think for airflow in the small case. It don't get real hot, and hasn't given any hassle, so I call it "art" :)

The black plug is a USB cable going into the TPlink board. The Cat5 actually goes into a plug under the board on the right.

Like I said, it looks odd, but it works. If you follow the link at the top of the post you'll see more images, including some through the top of the case. My lighting wasn't real good, so it's not as crisp as I would like. I'm going to re-shoot with more serious light as soon as I can find the damn serious light! (the joys of packing things where you'll remember them...)

Your Kill-A-Watt is getting used here shortly. On that note, to address one of Puppet's queries, the PSU is a FSP Group model fsp300-60GHS. http://www.fspgroupusa.com/fsp30060ghs80/p/606.html (http://www.fspgroupusa.com/fsp30060ghs80/p/606.html)

I also have a question for the seasoned miners, or at least Eligius users. Why does my indicated hashrate jump around so much over the short term? It doesn't in Cgminer. It various maybe 1-3 GH/s overall, but on Eligius it's as much as ten both ways. It seems to average out just above 80 most of the time over three hours.. is this a connection thing?

https://i.imgur.com/VP5fEwu.jpg (http://imgur.com/VP5fEwu)

Puppet wins this round. It's drawing 146 watts. Still pretty good, but not 80.

Still a lot better than my BFL Little Single (now sold) that ran 150W for 30GHS

Well, I'm trying to overvolt it a bit now. So far the results on that are a bit odd, and disappointing. Of course, I really don't know what I'm doing, and don't want to kill the machine...

Does anyone of you nice people know how hot (voltage) I can run the bitfury chips without letting the smoke out? I went from 900mv to 920, and it raised it about 2-3 GH/s avg at first, now it's back down around 80-81 consistent with spikes up to about 90. Pulling about 15 more watts. I'd like to kick it up a bit higher. Also, what should I set frequency at? It's defaults are frequency 540 and 900mv. I left frequency alone, as I haven't a clue what it's supposed to do.

BTW, I was wrong about their being a Pi in the beast. It's a tplink openwrt router with the Hexminer/cgminer firmware flashed in. The interface is simple as hell, but no docs.

Keep 540
900 will kill these boards

Best

Really? 900 was how it came to me. I just kicked it down to 880, will see how that does. Thanks, Martin. Didn't know you were watching :)

Is there docs for these someplace? The search function on this forum is... retarded. It misses things I was just reading.

I think he meant 920mv would not be nice till you do a litefoot on it, and add sinks to fets and pll chips if not done already.
Litefoot is hacking jalleys right now, started on BFL singles this week. Smart guy... will link when I find it.

Hacking, volting, cooling, soldering, and adding chips:
https://bitcointalk.org/index.php?topic=336782.0

Could be. But dropping it to 880 seems to have stabilized the swings and still is hashing right at 79-80 GH/s. Dropped it 10 watts on the Kill-A-Watt too. This is fun :P

My little bitcoin has arrived. Cara Michelle Biomech came into the world at 13:13 today, 7lbs 8 oz. We are still at the hospital, but mama and baby are doing fine.

Congratulations man, enjoy!

Awesome, congrats!

congrats! start her wallet now...  lol

still in hospital. Soon ;)

BTC RESP hmmm what an interesting idea.  Think I will take a couple BTC for each of my kids and stick em in cold storage till they're ready for University.

Before this thread is totally derailed, here she is!

https://bitcointalk.org/index.php?topic=420848.new#new (https://bitcointalk.org/index.php?topic=420848.new#new)

Congratulations!
Enjoy.

updated OP

OP updated.

I think you meant to say Technobit is the real deal. All AMT does is buy Lian Li cases and put Technobit boards in it.

The same could be said of your computer. I all but guarantee that all of it's components are "outsourced". That's a quibble, at best. They put it together well. I have heard lots of bad stories about the technobit boards in other applications. Good ones, too. Just like anyone can slop together a computer, but doing it right takes some finesse.

Besides, I always knew technobit was the real deal. Watched that project from Klondike onward :)

Updated OP.

Biomech, I know you didnt ask to be a reviewer, so Im cutting you all the slack I can manage, dont take this personal, but really, you didnt review the AMT unit, you reviewed OpenWRT + cgminer. Just about nothing you tested is unique to AMT, somehow you managed a review without even looking at the box. No word on noise levels, build quality, size/weight, power consumption (!), no look under the hood whats actually in there, what PSU did they use, what boards, what router/host, etc, etc.

Keep picking at me. I don't take offense. I want to do this right.

I'll shoot some more stills and put them in this thread. To be perfectly honest, I think they picked the wrong guy. I'm a veteran of computers, not bitcoin miners. I'm also pretty much a political theorist. I do NOT understand why I was the one they chose.

To answer your specifics on this, the power consumption varies somewhat, as does the hashrate, but the range is 165 to 180 watts, usually tending to about 170. The router/firmware unit is a TP-Link TL-MR3020 . The two hashing boards are Technobit HEX16B bitfury based units.

I want to address the "nothing unique to AMT" part. You are correct in this. They assembled it and configured the firmware. They are essentially a reseller, as far as I can tell. I think they are trying to make their own boards for the Coincraft series, but this one is a technobit, preconfigured and put in a nice case. While I find their lack of communication and transparency as egregious as the rest of you, I don't find any problem with this part. The very mainstream laptop I'm typing this on is under the "acer" brand, yet when I took it's twin apart, almost nothing under the hood was made by or even branded by acer. Same with Dell, HP, etcetera. It's been the model in computers for a long time. Components are rebranded and repackaged. We knew they were working with Technobit before they shipped a single unit, so they weren't even opaque on that one.

I am upset with them. I really wanted them to come through. I'm sure you saw my post in the main thread, and it's the truth. But unless they drastically change what they're doing within the next few days, I'll be buying Ants. Which sucks, because I DO like this machine. It worked as advertised, aside from the power draw, and that's pretty significant in this brave new world. But doing it once or twice and doing it en masse are different things. I can't endorse this company as it stands. I am grateful for the machine, but they didn't follow through.

I took a few shots at you early on. It was mostly in humour. I think you are one of the more objective, if pessimistic, people on this forum. I'm an eternal optimist, and it has burned me on more than one occasion.

AMT gave me a start in bitcoin mining, and have personally done well by me. It was unexpected, kind of flattering, and a lot of fun. But I'm one guy, and by now there should be hundreds. I'll keep updating this as I play with the machine, but I will not endorse AMT based on this alone. So far, as near as I can ascertain, maybe a dozen people have received these machines, and I've not heard of any major problems with them. But they have not addressed the minor ones, such as lack of proper documentation, shipping queue, refund policy, all sorts of frankly trivial things that even a small company should have resolved in this timeframe. I've withheld my criticism of the company till now, but they have not lived up to that. I still have hope that they will pull it out as I do not believe they are operating out of bad intent. But they cannot continue in the lackadaisical manner they have been and be a real contender, even as a reseller. If I were enough of a gambler, I could do better. I have a lot of business experience as a manager in food service, which is WAY tougher than this.

And from my own side, I have dropped the ball on this. I can't say "it's not my fault", as it's a copout. I can say that I'm under an enormous amount of stress with things unrelated to this, and it wasn't as high a priority as I think a lot of you would have liked it to be. I didn't ask for it, but I did accept it.

Again, keep picking at me. I learn from it.

Edit: Noise level. It's pretty quiet. The camera/mic was two feet from the machine in the video. The fan runs constantly, but it's unobtrusive. I don't even notice it most of the time. I'd guess 5-6 db above ambient. That is a guess, I can't measure it.

As trivial as the actual db rating is, if you have or know someone with a smart phone there are a bunch of free apps that will measure the sound level.

I could measure it off the mic with a plugin for FLstudio, too. But it's wildly inaccurate. I used to have a proper meter, and I've never seen the software ones come even close. I'm a singer, so on that issue I'm actually less ignorant than on reviewing this damn miner :) I do have an old smartphone. It's pretty much shot, though. I use it as a web browser, cuz the mic and speakers are fubar.