Topic: Building Cheap Miners : My "Secret" - page 11. (Read 60235 times)

That system is four independent servers with two redundant psu for all of them. You will need four hard drives and four operating systems. I recommend you learn how to use ansible and keep them all in sync.

I just got this: https://www.supermicro.com/aplus/system/2u/2022/as-2022tg-htrf.cfm  equipped with 8x Opteron 6376, 128GB ram, 4x 128GB SSD, 2x 1100/1400W (120v/240v) PSU ($1500 shipped).  Is there some problem with them being 2x Opteron per independent board?  Is the issue with the additional power overhead per board as compared to maybe having a single 4x 63XX board?  

I don't intend to mine one particular algorithm.  I bought this for the flexibility to mine new CPU exclusive algorithms so I'm not really interested in 750ti or various other GPU scenarios.

Also, I have been trying to understand how I will manage this and what the best way to mine might be.  Is it possible to link/cluster all boards and use 1 SSD?  Any thoughts on removing RAM and maybe other components to reduce the wattage footprint?

And... For now, I just have 120V power so will be limited to 1100 watts power. But there are two 1100 watts PSU so not sure how they stack or if the other is purely for redundancy.  Once I go to 240V it could be 1400 Watts PSU but that won't happen for another year+.  

Does being limited to 1100 watts limit the mining potential?  I know 115W TDP x 8 is 920 so I'm already past the 80% threshold... and then let's add in other components...

Thanks for any thoughts.  Especially thoughts on the best way to manage mining rather that be independent or clustered server management of the 4 boards in the 2022TG-HTRF unit.  

Another thought... I might consider using unused resources for other tasks such as home server or various IT training labs.  It seems like many mining options do not utilize all cores and that there could be other resources available for other less demanding tasks.  thumbs up/thumbs down?

Yes, I'm aware of what you're asking. That's what I was answering, it sounds like it's 16A rated not 20A rated. If it was 16A continuous then it would obviously have to be a 20A breaker to handle that power. No?

If the breaker says 16A on it, it's probably not derated. The easiest way to tell would be to push 15A of power through it and see if it trips. If it trips, it's not derated.

To reply to some of your other points... The 6-20R/P don't come loose.. They're also like $1.50 for 2 outlets and you're using the exact same length, gauge and count of wire. The only thing that changes is you've added a couple boxes to hold the outlets.

Here's my old mine... https://bitcointalksearch.org/topic/ann-bvshost-bitcoin-miner-hosting-70-to-75-per-kw-873046
I know a little something about what i'm talking about.. Even if my name is senseless.. We had 10MW capacity and 1MW built out before the 2015 crash shut us down.

Whats more interesting to me these days are these tripp-lite units using 415/240Y. You can place a single primary voltage -> step down at multi-mw level to 415/240. From there you can use 480/277 panels to deliver insane amounts of power to your racks. These tripp-lites are hardwired. There is one caveat though, going this method increases AIC and it is recommended required you add in-line fusible disconnects to reduce AIC. The fusible disconnects can be rated above the breaker amperage so that they never blow. The fuse itself though will reduce AIC due to it's design. DO NOT DO THIS UNLESS YOU HAVE AN ELECTRICIAN WHO KNOWS WTF AIC IS AND HOW TO CALCULATE IT. THERE IS ARC FLASH POTENTIAL HERE. Most electricians haven't a clue. This a european style electrical system thats used a lot in iceland for instance. It's still 60hz (in the usa) but in EU (50hz) they have a tendency to use fusible disconnects more than they use breakers. The fusible disconnects reduce AIC and arc flash potential. By reducing the number of transformers and step downs they significantly reduce the cost of building and maintaining their electrical grid.

https://www.tripplite.com/28.8kw-3-phase-switched-pdu-240-230-220v-outlets-24-c13-6-c19-hardwire-415-400-380v-input-0u-vertical~PDU3XVSRHWB

I suspect that using these will pay for itself by reducing man hours during installation/setup. Plus, who wouldn't want API based remote reboot? -- In addition you'll save costs on various panels, sub panels, isolation transformers, wiring costs, electrician costs, etc, etc. I expect a 415/240 setup at multi-mw to cost about 50-75% of a traditional 480/277 with isolation step down.

@sundownz let me know if this is interesting to you. Happy to talk to your electrician. I really want to see one of these setup but have no use for it myself at present. You're probably getting close to filling up your transformer by now.

I know that the PDU is 16A. I never stated that it was 20A.

My original question, which has yet to be answered, is can the PDU run 16 Amps continuous or do I have to use the 80% rule and only run it at 12.8 Amps.

If someone here  has server room experience I would like to know an answer to that question.

EDIT: After more google searching this is the best I could find as an answer to my question:


https://arstechnica.com/civis/viewtopic.php?f=11&t=1158437

The PDUs I purchased only cost $12.50 each.

I am garage mining and putting six duplex 240V 20A outlets into a wall and then cabling them to the backs of the servers would be a cabling nightmare. I currently have eight servers up and running with two more being installed next week. I also use 240 VAC to power an 8-port KVM and a 24 port gigabit network switch. That works out to be 12 cables.

Also having the 16 AMP PDU keeps me from accidentally pulling too much current from a 20 AMP breaker in the power panel (80% rule).  

You can put 3 duplex 240V 20A outlets on the 20A line. No problem.  For 20A you're wasting money using a PDU. It's only worth using a PDU when you're pushing 30-50A.

It sounds like it's 16A rated not 20A rated.

Well I do need the PDU since I need to power five or six servers from the 240 Volt 20 AMP circuit.

As for what I have installed:

In electrical breaker panel I installed a 20 AMP BR220 breaker which is then wired using 12AWG wire to a NEMA L6-20R Twist Lock Receptacle.
Then from the L6-20R Twist Lock Receptacle I use a Tripp Lite 20A, 12AWG (IEC-320-C19 To L6-20P) Power Cord to connect to the PDU

I really like the Twist Lock Receptacle and Plug. Less likely for it to fall out or lose electrical contact.


The Spectrum Control PDU 72A-116BUHEN-01 8-Port Power Distribution Units with 16 AMP breaker for ON/OFF was purchased used on eBay and came without a manual. I have searched and all I can find is basic information on it such as:

Basic 0U, 30-33” Single Phase - Single Input
72A-116BUHEN-01 Input VAC:(100-127)/(200-250), Output VAC:(100-127)/(200-250), Amps:16A, KVA:3.7,
Dimensions:30 x 3.0 x 1.5, Outlets:8 x C13, Breakers:1 x (2P 16A), Input Plug:Inlet IEC C20

Density – Electrical 102
http://www.cointainer.life/2018/02/22/density-electrical-101

I had hoped that since PharmEcis published that article and used the same configuration that he could elaborate as to what the maximum current that I can pull from a 16 AMP PDU. Without any additional information I guess I will just have to try to use about 15 AMPs and see if the PDU Breaker doesn't flip.

For 20A you don't need to use the twist lock or the PDU. You can just go straight from the breaker to a couple NEMA 6-20R. Then you can get NEMA 6-20P cables that plug directly into the outlets.

The 16A for the breaker in the PDU may already be the derated capacity. I'd recommend reading the manual to find out for sure.

Thanks for the blog post about using 240 VAC to power server mining rigs.

I have installed two 20 AMP 240 VAC circuits. Each configured as:

20 AMP BR220 breaker in electrical panel to NEMA L6-20R Twist Lock Receptacle, 12AWG wire
Spectrum Control PDU 72A-116BUHEN-01 8-Port Power Distribution Units with 16 AMP breaker for ON/OFF
Tripp Lite 20A, 12AWG (IEC-320-C19 To L6-20P) Power Cord from L6-20R Twist Lock Receptacle to PDU

The question I have concerns the maximum current I can draw from the PDU. Does the same derating (80% of max) also apply to the 16 AMP breaker in the PDU?

The sound logic in the article shows that 80% of 20 AMPS is 16 Max AMPS for the main panel breaker. Which was why the choice of a 16 AMP PDU was optimal however if the 16 AMP breaker in the PDU also has to be derated by 80% that would put the max current at 12.8 AMPS.

I currently have one circuit at 12.8 AMPS and the other at 9.1 AMPS.

My problem is that I have three more servers that need to be added to those circuits and that would push the current to 15.5 AMPS each.

Is it okay to do that or will the breakers on the PDUs flip off after some time when they heat up?

On your setup do you know the maximum current you are drawing on any one circuit?

I would like to know that number to determine if I have to add a third circuit.

Thanks.

I am trying to keep my overall costs down yet pick up some good hardware for mining. I also tend to look for hardware that will keep (or increase) their value and that could be resold later if I had to. My hardware decisions may not get the highest hash rates but they are close and certainly I try for the best bang for the buck.

An example: I was informed by a forum member about the R815's and where to get them and that for an additional $400 + tax they would come with quad 6380's but I felt the additional 700 H/s was not worth the extra $346. Instead  I added three more GTX 750's to other systems at $116 that produce the same 700 H/s.

I am using about 70,000 watts right now roughly.

The main supply to the warehouse was already adequate but, yes, I had to add runs from existing breaker panels AND also have an entirely new panel installed as well.

Yea, I knew it was a 4 node server, but if the hash was high enough I figured I could deal with it.  I can’t get the math to come out right though.  My target is 25 cents or less per MH on Heavy and unless this server was half the asking price, it doesn’t fit my criteria.

Man, you’re getting some inexpensive (not cheap) components, so I can see why you’re doing so well!

For those who are interested in mining on quad Opteron Servers this might be of interest:

Dell PowerEdge R815 SFF 2U 6-bay Barebone CTO Server 2x 2.5" Tray, 2x 1000w PSU
https://www.ebay.com/itm/Dell-PowerEdge-R815-SFF-2U-6-bay-Barebone-CTO-Server-2x-2-5-Tray-2x-1000w-PSU/122964328060

I picked up two of these earlier and added Quad 6234 Opterons into each of them along with a single GTX 750. The above systems come with heatsinks so all you need to add is the Opterons and memory. NOTE that these need 4 sticks of memory for each processor. I installed 16x 2GB PC3-10600R 2Rx8 memory for a total of 32GB for the system. If you use less than 4 sticks per processor the system complains.

I have Ubuntu 16.04 LTS Desktop installed on a 16GB USB stick in the internal port. Compiled and running XMR-Stak for Monero7 I get 1560 H/s on the four processors and 240 H/s on the GTX 750 for a total of 1800 H/s.

I am local to the seller so the R815 only cost me $230, the four 6234 Opterons $87, 16x 2GB memory $37, GTX 750 $38 and $4 for the 16GB USB Drive.

Total of $396.

I see the system you are looking at. Be careful. That system is actually four independent dual  6272 servers in one 2U case.

https://www.ebay.com/itm/Supermicro-Server-2022TG-HIBQRF-8x-AMD-Opteron-6272-2-1-GHZ-128-CORES-128GB-RAM/202318902893

Look at the picture of the back and you will see 4 VGA ports. One on each dual  6272 server.

You can also see one of those dual  6272 server modules being pulled out in the final picture.

Curious, how much power are you pulling and did you have to customize the electrical wiring of the warehouse?

Thank you.  I’d ran across an 8x6272 server and was wondering if it might be worth it.  I found the original thread I was referring to... somebody was getting 2000hs out of 4x6276, but that was old CN before the forks.  Was hoping to get around 3000hs out of the 8x, but guess not.

On quad 6380s I only get about 1050 H/s.  A single 6272 I would assume would be 220H/s or so on heavy, perhaps even less.

What hashrate would I get on CN Heavy using an Opteron 6272?  I could have swore I read it in this thread somewhere, but I can’t find it now.  Thanks!

I'm not sure even if the original motherboard he has is still good.

https://bitcointalksearch.org/topic/m.37523586

The beep can indicate other hardware issues -- such as a bad power supply.

Are you certain the PSU is good ?