Quote from: mikeywith on September 17, 2018, 12:45:02 AM

Quote from: mikeywith on September 17, 2018, 12:37:42 AM

Quote from: imine2 on September 16, 2018, 05:22:07 PM

Quote from: shater on September 16, 2018, 03:59:53 PM

Quote from: mikeywith on September 16, 2018, 01:56:29 PM

Quote from: imine2 on September 15, 2018, 09:48:45 PM

Quote from: mikeywith on September 15, 2018, 08:51:24 PM

Quote from: oomurashin on September 13, 2018, 06:30:28 AM

Is it dangerous to connect multiple ASICs from one PSU? Roll Eyes

it's the other way around. it is dangerous to connect multiple PSUs to a single ASIC. you can connect as many asics you want to a PSU as long as both your PSU and the 6pin connected can handle the power needed. from a theoretical point of view you can have 4 z9 minis connected to 1 APW 1600w psu ( each z9 mini takes about 350w if not overclocked" ). how ever i would not do that until i verify that the 6 pin connectors which are going to be split can actually handle the load.

https://bitcointalk.org/index.php?topic=1739630.0

You don't want to run your engine on max RPM to loong.

It's the same with PSU's.

this is completely based on your own or someone else's speculations and it has no solid proof what so ever, the max you see on the label is the safe point which a good psu should handle all day long. I have been pulling about 970w of a 1000w psus on my rigs for years and zero problems, it all comes down to the room ventilation and the quality of your PSU. bitmain psu is a solid psu. i have some A3 and S9s slightly over clocked consuming close to 1500 for ages and never a problem with the PSU. you can test it out yourself if you like.

Yep, agreed. I haven't had any problems with my Z9 running at max settings. Bitmain left lots of room for tuning in these things.

in the link I gave this one is on page 2:
https://bitcointalk.org/index.php?topic=1739630.msg17440217#msg17440217

And this one:
https://bitcointalk.org/index.php?topic=1739630.msg17440489#msg17440489

You guys are correct!!!
The Label doesn't give the full answer !!!

For all the people who read your answer's they might not know as much as you guys.

Do they have 120V or 240V?
50Hz or 60Hz ?
Does it matter ?

Do you RECOMMEND that everyone push their PSU's to the limit according to the label on their PSU's whatever brand, age (manufacturing year), earlier usages if not new from the store, voltage, ... Huh

If not, WHY ?

Everything will always go well until it goes wrong !!!

you don't have to push your PSU to the limit if you don't have to Cheesy

. also you do not want a lot of spare power sitting there doing nothing when you have to buy another psu ! . if there is a room on your psu which you can use then just use it.

I don't have a 120v circuit i think only people in the U.S and a few other countries have that old power infrastructure. i don't know how much exactly in WATS you would be able to pull from APW psu but i am sure it is not 1600w. i think 1200w is the BEST you could wish for but then dyor regarding that matter.

assuming you can get a 1200w of it, then it's safe to say that you can consume 1200w from it , all year long Cheesy

.

** so this is what bitmain has on thier page

APW3++

The APW3++ can deliver a maximum power of only 1200W if it is connected to a 110V mains power supply. To obtain the rated power of 1600W, the APW3++ must be connected to a 220-240V

APW7

The APW7 can deliver a maximum power of only 1000W if it is connected to a 110V mains power supply. To obtain the rated power of 1800W, the APW7 must be connected to a 220-240V

so if you are using 110 vs then you should get the APW3++ which give you 1200w . if you are using 220v then you should get APW7 as it gives you 1800w instead of 1600w.

Follow up - my own Real Life example:
I've been running my single z9 mini for about 2,5 months on this PSU.

My PSU was bought new and SHOULD deliver "Max power" 648W and "Max load" 54A on +12V according to label.
I've been running solid 768MHz overclocked using may 26 firmware and by SSH'ing up'ed to 768MHz.

Antminer Z9 mini label says max 35A
(I guess max 35A equal each ASIC-board is about max 10A @12V and controllerboard about max 5A @12V including fan)

The actual total power drawn meassured from wall socket was about 418W @ about 234V @ 50Hz

418W / 12V = 34,83A

(UPDATE:
I forgot to compensate for the PSU's own heat disipation which I approximate to be about 80-90% efficency when powerusage drawn from wall socket is 418W.
So.. (85%)
34,83A * 0.85 = 29,66A * 12V = 356W is somewhere close to what the z9 mini consumes in power (NOT exactly) )

Problem:
Apperently the PSU was NOT able to continously(year after year) deliver "only" about 35A on +12V which isn't anything close to 54A according to label. If cable/connector melts after about 2,5 months it's not built to deliver continously power according to label ! ! !

My Z9 mini been running inside my home with ambient temp around 24-27 degree Celsius and humidity between 35-60% according to sensor built into firealarm coupled to housealarm system during this hole period.

PSU label:
https://imagebin.ca/v/4HFBVBvgQYCR

On the left the cable/connector in PSU for board 2 and 3 which has melted on 3 pins. On the right the connection still in it's port for board 1 + controlboard and still working.
https://imagebin.ca/v/4HFBzmxy2xyt

Something to consider !