Hello I´m trying to get new rig runing. My 3x vega cards on main PSU are woking fine but whenever i try to run the cards which are supplied by second psu it runs for sec and then the second psu and the cards supplied by it shuts down. My main PSu is Evga gold 1000GQ My second PSu is same brand but 700w - Evga gold 700GQ which i use to power 4th and 5th card and their risers(tried to power risers from main psu had the same effect) I can mine on 4th or 5th vega when launched without the cards on main psu
Is it a PSU problem ? i also have just 4gb ram but i have enough paging file memory on ssd
what cables are you using? I experienced a similar problem trying to connect a couple of Vegas to a 750W PSU which only had 3 8 pin PCIe connectors, so I had to use a 2 8Pin PCIe to 1 8Pin PCIe adaptor, and the PSU run for less than a second because that cable in particular created some kind of short circuit, and the solution was to use another conector, a SATA to PCIe adaptor which did the job quite well.
It loooks like this
https://imgur.com/a/EdcbA after i start cast xmr it works for few seconds then the 2x cards on other psu shuts down
im using
https://www.miner-shop.cz/prislusenstvi/psu-2-psu/tryed changing gpu powers cables to 2x 8pin in vga and 2 x8pin in psu from 2x 8pin in vga and 1 8pin psu it had same effect
I managed to get it work with turning on and off all cards in devices and also turning on and off hbcc on all cards this makes it work but only for 80 mins then same thing happens
you don't need to do that. Maybe that cable isn't stable enough and creates some stress on the motherboard. There is a much, much cheaper and energy efficient solution to use 2 PSUs at once --I've seen some miners using a very expensive adaptor to connect 2 PSUs to the same motherboard.
ONE of the PSUs doesn't need to connected to the motherboard at all. Learnt this trick in my first year studying computer science and testing computers, 2 years ago --it was one of the questions in the exam
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The green and black cable of the the PSU can be bridged using a paper clip, this is meant for the PSU to be tested and check if it works or not. If the fan starts spinning then the PSU is fine (so you check for issues on other componentes).
The EVGAs include a piece of plastic to make that bridge and test the PSUs. You can use that or just the paper clip trick, a bent needle, etc etc etc.
https://aphnetworks.com/tutorials/psu_paperclip_trick my psu´s cables are all black
probably an EVGA? EVGAs come with a plastic piece and 2 pins which have the same function as the paper clip trick, checking if the PSU is working well. iirc, it's the 13th and 15th pin you just need to connect, but I am talking from memory here, there should be guides online.
both Psu we workin just fine i dont know what was the problem tryed everything several times including diffrent 2x Psu adapter or without adapter using paper clip triick im not amateur when it comes to hardware but ended burning up my second Psu with dat magic paper clip trick , But I managed to get 5 vegas workin on the first psu 1000W evga but undervolting it alot l i get now 9150h but pc crashes from time to time (5times a day least..) So I want to buy second psu to get it workin properly with stable hashing 24h , Problem is the same Evga gold 1000W which i alredy have would take 3 weeks before it gets to me So i want to buy other Psu but dont want to burn it like the last one ? so Should i wait for the same PSU or can i buy diffrent PSu with 1000W power ?
Btw thx for answers
what happened?? I can tell you that I am not the most handyman in the world, in fact, on the contrary, I try to be very careful because I feel very bad if I break something, but tried that trick in class and at home and never ever had an issue with it.
The EVGAs you have keep you from going over that hassle because I also have a 1000W and a 750W EVGA PSU and they are bundled with a nifty piece of plastic that emulates the paper clip, but it's like a billion times easier to test the PSU that way. I used that piece of plastic in 2 of the Vega rigs I've built. Wonder how you missed that, I mentioned that piece in a previous reply to you, and the EVGAs come bundled with it.
How do you manage to have the Vegas mining at 2000H/s with a power consumption of 100W? That sounds like a miracle. I optimised mine as finely as I could and the power consumption is 140-150W off the wall, I measured it recently, so I am curious...