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[kano]

...
2 x Avalon 741 is better than 721 and 741. We can save room.
Can we run SAFE 2 x Avalon 741 on Antminer AWP5 PSU 2600W?

I'm not sure. It's close to the limit.
If the PSU is not high quality then you may find it isn't safe.

I run the 741 on a 1250W OCZ Gold and the 721 on a 1200W Seasonic Platinum and I'm probably pushing them too hard but they are both quite high quality PSUs.
If I ever had the inclination, I could run the 741 using two OCZs since I have two, but for now I've left it on one.
The OCZ  is a very good PSU and I've had the two of them since I started GPU mining, without any problems.

The PSU that came with the Bitmain S2 was a POS, under powered, and died, but I've no idea what they sell now.

[1714035098]

1714035098

[1714035098]

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[HagssFIN]

Bitmain APW3 PSUs have actually been quite reliable for me and I haven't heard much talking about them breaking up.
Definitely a big improvement after using the Enermax PSU with the Antminer S2 and all the poor quality Apluspower PSUs used in the Antminer S4.

If the 741 really uses 1150W at the 12V side, that would make two miners 2300W.
So if you got about 230V mains voltage and good cooling in your place, I would say it is possible to use the APW5.
With 230V you will need at least 16A dedicated circuit for it.
This is said by a guy who knows IEC standards.

For ANSI standards a.k.a. United States I'm not the guy to give perfect answer.

[citronick]

canaan avalon 741 actual load

So I am trying to justify moving completely away from bitmains S9's and into canaan avalon 741.  Yet power is everything in this game.  I need numbers.  An Avalon 741 is rated at 1150 watts for 7.3TH where an S9 is rated at around 1300W for 13.5Th.  Can someone tell me what the 741 is really pulling. It takes 2  741's to get the hashing power 14.6 TH, but now you are at 2300W.  That is crazy, 1000 watts more to get the same damn hashing rate as bitmain, really? I am not looking for cheerleaders on either side but rather the facts that can be backed up.  

Thanks!!

simple facts the s9 gets better power results then the avalon 721 or 741

the s9's I owned and still own broke quite a bit.

the r4's get better power results then the avalon 721 or 741
the r4's I own have a bad failure record.

The 3  avalon 721's I own all work.

Last set of  facts and these are  very important facts
 if your power cost is over 10 cents  mining sha 256 for btc is not a good idea you should go for alt coins

 if your power cost is 8 to 10 cents  a kwatt the s9 looks to be the better buy.
 if your power cost is 5 to 7 cents a kwatt the s9 or a721/741 are neck and neck
 if your power cost is under 5 cents a kwatt the 721/741 is the better choice.

My group's BTC farm consists of 108 x S9-v1s for about 7 months now, and 120 x A721s coming 2 months.
Labrador ISP is using Hydro power so its the "5 cents" range as listed by Phil above.

S9 farm - about 15-20% of the lot gives me a lot of headaches (mostly HW issues, dead boards & controllers) and required 3 x RMAs to get them to behave. I must admit that Bitmain has honored all RMAs but process takes 2-3 weeks each which too long. Every miner down = lost in revenue. Daily farm monitoring is mandatory so my ISP runs a script to scan and pick out S9s that hashes below a threshold and reboots that miner. Last resort, power cycle that is still done manually by on-site engineer or I remotely access the APC Switched PDU system.

A721 farm - after setting and finetuning the controllers (6 x controllers manages 20 x A721s), they rampup fast and hash. About half of them are hashing at near maximum speed (120THs per controller) and the other 3 slightly under 100THs per controller. Still fine-tuning them along the way and no RMAs required yet. Farm management is a breeze because any pool changes is done on 6 x fast controllers, unlike S9s where without a proxy server setup, you basically need to change pool settings on each miner. I dont worry about the A7 farm as much.

Conclusion:
I rather be happy the farm is steadily mining - stable and HW in tip-top condition, than a farm that needs babysitting and headaches all the time but gives me "a few more BTCs because of that a few hundred extra THs" -- BTC$ speak, I rather pay that amount to have a steady farm and a peace of mind.

Eventhough, we go strictly by hash/power ratio => ROI => profitability, I have to add another factor: "hash opportunity lost due to downtime/underhash". At this point, A7s is leading the way in overall efficiency. My group will do a final expansion of the farm from 2PH to about 3.3PH this year (short of buying our own power transformer), likely will use A741s or better, to deliver best overall operating efficiency. If Bitmain can get their quality control improved then we have real case to consider their S10 or whatever, meanwhile full speed ahead because Labrador has a long winter period.

Good mining everyone!

[firetreeactual]

Thanks for that one, Cirtonick.

A bit OT, but I'm not hearing back from Jon yet (it's early there)...anyone know if I can run this 721 and the new 741 from the same controller that's been running the 721? It has the most recent .img on it.

[HagssFIN]

Thanks for that one, Cirtonick.

A bit OT, but I'm not hearing back from Jon yet (it's early there)...anyone know if I can run this 721 and the new 741 from the same controller that's been running the 721? It has the most recent .img on it.

Yeah, you can even run them in the same chain.
Older Avalon generations can also be used with the same raspberry pi but they need to be in a own chain.
So what I mean is that behind one usb adapter you can't mix A7s and A6s for example.

[firetreeactual]

Thanks for that one, Cirtonick.

A bit OT, but I'm not hearing back from Jon yet (it's early there)...anyone know if I can run this 721 and the new 741 from the same controller that's been running the 721? It has the most recent .img on it.

Yeah, you can even run them in the same chain.
Older Avalon generations can also be used with the same raspberry pi but they need to be in a own chain.
So what I mean is that behind one usb adapter you can't mix A7s and A6s for example.

Cool...that's what I had thought. Thanks you muchly.
 

[philipma1957]

Thanks for that one, Cirtonick.

A bit OT, but I'm not hearing back from Jon yet (it's early there)...anyone know if I can run this 721 and the new 741 from the same controller that's been running the 721? It has the most recent .img on it.

yes and in the same chain.  or so I have been told.

[kano]

Anyone mining on the nonce proxy, that completely dropped off the air for a few minutes there at 09:14:42 UTC
The Vegas datacentre seemed to completely disconnect off the net, but came back up a few minutes later - I have another (temporary) server there also that showed no response.

Fortunately the new main server isn't there any more, thus it only affected the nonce miners.
All back OK again and all the nonce miners reconnected by 09:21

[bit2255]

Block!!

by cobramining!!

[kano]

Block!!

by cobramining!!

With an A7v1

[clgrissom3]

Block!!

by cobramining!!

With an A7v1

Okay!  Good start!

[kano]

Both the DE node and the NYA node did a reconnect at 14:14 UTC
So all miners at DE and NYA will have failed over (and back again 5 minutes later)

DE repeated that a 2nd time a few minutes ago but everyone failed back straight away.

MTR shows some severe network issue out on the net between the servers (not at the servers) at 'ntt.net' and routing going haywire, so out of the control of the server providers.
It seems to have settled down, so hopefully will stay that way.

Edit: nope, it's happened again for both DE and NYA at 14:40, so failover for everyone on DE and NYA again, but both have reconnected.

[-EOS-]

Thanks Kano.   Was wondering what happened there..

[clgrissom3]

Block by canaan!  This is your 85th Kano block and our 2nd of the day! 

[bit2255]

Did I hear you whisper..super Tuesday?

[darval]

Block by canaan!  This is your 85th Kano block and our 2nd of the day! 

I think that's the fattest block since the halving.  Juicy.

[clgrissom3]

Block by canaan!  This is your 85th Kano block and our 2nd of the day! 

I think that's the fattest block since the halving.  Juicy.

Holy crap!  14.21129383!

Anyone else notice that our MeanTx% keeps getting higher and higher every month?  Kano is doing good things with this pool!

[-EOS-]

DAMN!!!!!       WOooohooooo

[fusion0389]

I like whats going on with the block rewards, thats almost 2 btc worth of transaction fees.... looks like mining is setup to work well even after the block rewards eventually disappear. Hopefully this trend continues.

[VRobb]

Did I hear you whisper..super Tuesday?

I heard "two-fer Tuesday"!  How about a three-fer?