power supply problem

[razvan86ro]

Hi, I want to build a mining rig for ethereum, the first personal rig but I have a problem with the power supply. I have two radeon RX 480 SAPHIRE OC edition, two radeon RX 470 OC edition and I will buy soon another 1 RX 470 OC . I used a wattmeter  to measure how much watts takes a video card and I have  about 210W.

After my review and calculations I want to build a rig with 5 cards, two slots pci express 16X and 3 pci express 1x with risers.

Now I have a problem with power supply, I need an advice so as not to ruin things, because of the price of a big power supply in my region I want to use two power supplies like this:
1 power supply for the motherboard, cpu, hdd and  two  video cards on the pci express 16 X
2 second power supply for risers and the rest of 3 video cards .

It is ok like this ? I will burn the video cards ?   

Thank you

[Cereberus]

Hi, I want to build a mining rig for ethereum, the first personal rig but I have a problem with the power supply. I have two radeon RX 480 SAPHIRE OC edition, two radeon RX 470 OC edition and I will buy soon another 1 RX 470 OC . I used a wattmeter  to measure how much watts takes a video card and I have  about 210W.

After my review and calculations I want to build a rig with 5 cards, two slots pci express 16X and 3 pci express 1x with risers.

Now I have a problem with power supply, I need an advice so as not to ruin things, because of the price of a big power supply in my region I want to use two power supplies like this:
1 power supply for the motherboard, cpu, hdd and  two  video cards on the pci express 16 X
2 second power supply for risers and the rest of 3 video cards .

It is ok like this ? I will burn the video cards ?   

Thank you

It is a good idea actually. I suggest you to buy 2 power supplies of 700 watt each, 80 plus gold certified, cooler master, corsair or thermaltake.
You can connect them parallel to each other. There is a green wire which gives power to the PSU and it gives power to everything connected to them, once you connect this wire to the both PSU-s it will automatically give power to the second PSU.
For this consult with your IT guy, it is easy to do.
If you don't want to do this then buy a Corsair HX1200i platinum 80 plus certified and it can run 5 cards RX 470 without problem.

[Vann]

I recently upgraded to a dual power supply setup which had me researching on how to connect them safely.

I came across posts suggesting powering the riser and PCI-E power connector on the card with the same PSU. Others say the psu that powers the motherboard must also power alll the risers. The slave psu should only power the PCI-E power connector on the card.

https://bitcointalk.org/index.php?topic=1761303.msg17825999#msg17825999

https://bitcointalk.org/index.php?topic=1843586.msg18351224#msg18351224

Ultimately, I did follow the latter suggestion as it seems logical the same power supply that powers the motherboard should also power the risers connected to the PCI-E slots on the motherboard. The second slave power supply only powers the 6 & 8 pin auxiliary power connector on the video cards. According to another post I came across that connecting the PSU's that way ensures they share the same ground, which is important.



https://bitcointalk.org/index.php?topic=443540.msg4878774#msg4878774

I researched  for a single 12V rail, dual conversion PSU to use as suggested and went with the EVGA SuperNOVA 850 G2 220-G2-0850-XR 80+ GOLD 850W for $110 after rebate from Newegg:

https://www.newegg.com/Product/Product.aspx?Item=N82E16817438018

It's a dual conversion, single 12V rail PSU. It has 4 PCI-E 8-pin slots, 4 6+2-pin PCI-E cables and two of the cables also have a 6-pin PCI-E splitter cable. They alaso have a 750W model.

To connect the two PSU I went with the Add2PSU unit, but it's  just a relay to daisy chains the PSU's so they start at the same time. The same can be done by jump starting the PSU with a piece of thin metal between the green wire and a black wire on the slave PSU and then turning on the switch on the back before starting the computer.

https://forum.overclock3d.net/showpost.php?s=3c0b5ead1c29a7c47c0e8fceb274ecf8&p=3815&postcount=1

Or using an automotive relay:

http://www.jonnyguru.com/modules.php?name=NDArticles&op=Story&ndar_id=27

You could also connect the two green wires on the PSU's and they will both start at the same time as long as they share the same ground.

[philipma1957]

Hi, I want to build a mining rig for ethereum, the first personal rig but I have a problem with the power supply. I have two radeon RX 480 SAPHIRE OC edition, two radeon RX 470 OC edition and I will buy soon another 1 RX 470 OC . I used a wattmeter  to measure how much watts takes a video card and I have  about 210W.

After my review and calculations I want to build a rig with 5 cards, two slots pci express 16X and 3 pci express 1x with risers.

Now I have a problem with power supply, I need an advice so as not to ruin things, because of the price of a big power supply in my region I want to use two power supplies like this:
1 power supply for the motherboard, cpu, hdd and  two  video cards on the pci express 16 X
2 second power supply for risers and the rest of 3 video cards .

It is ok like this ? I will burn the video cards ?   

Thank you

I should say to you one thing  what is your region you live in?

Can you get this mobo?
https://www.newegg.com/Product/Product.aspx?Item=N82E16813145007

It will do 1,2,3,4 cards.

really small  .

A guy like you should get 2 of these mobos  and build 2 rigs.

five and six card rigs really are not what you need.

if you have 2 mobos you can do up to 8 cards in a small place .

one rig can mine one coin

the other rig can mine a second coin

you can use smOS and check the rigs from anyplace in the world.

smos link
https://bitcointalk.org/index.php?topic=1541084.0

[Apneal]

I recently upgraded to a dual power supply setup which had me researching on how to connect them safely.

I came across posts suggesting powering the riser and PCI-E power connector on the card with the same PSU. Others say the psu that powers the motherboard must also power alll the risers. The slave psu should only power the PCI-E power connector on the card.

https://bitcointalk.org/index.php?topic=1761303.msg17825999#msg17825999

https://bitcointalk.org/index.php?topic=1843586.msg18351224#msg18351224

Ultimately, I did follow the latter suggestion as it seems logical the same power supply that powers the motherboard should also power the risers connected to the PCI-E slots on the motherboard. The second slave power supply only powers the 6 & 8 pin auxiliary power connector on the video cards. According to another post I came across that connecting the PSU's that way ensures they share the same ground, which is important.



https://bitcointalk.org/index.php?topic=443540.msg4878774#msg4878774

I researched  for a single 12V rail, dual conversion PSU to use as suggested and went with the EVGA SuperNOVA 850 G2 220-G2-0850-XR 80+ GOLD 850W for $110 after rebate from Newegg:

https://www.newegg.com/Product/Product.aspx?Item=N82E16817438018

It's a dual conversion, single 12V rail PSU. It has 4 PCI-E 8-pin slots, 4 6+2-pin PCI-E cables and two of the cables also have a 6-pin PCI-E splitter cable. They alaso have a 750W model.

To connect the two PSU I went with the Add2PSU unit, but it's  just a relay to daisy chains the PSU's so they start at the same time. The same can be done by jump starting the PSU with a piece of thin metal between the green wire and a black wire on the slave PSU and then turning on the switch on the back before starting the computer.

https://forum.overclock3d.net/showpost.php?s=3c0b5ead1c29a7c47c0e8fceb274ecf8&p=3815&postcount=1

Or using an automotive relay:

http://www.jonnyguru.com/modules.php?name=NDArticles&op=Story&ndar_id=27

You could also connect the two green wires on the PSU's and they will both start at the same time as long as they share the same ground.

Dont know why you people make it so complicated.
http://www.parallelminer.com/product/hp-1200-watt-power-supply-kit-for-gpu-mining-platinum-94-zec-dash-eth/

Power the PCI-E power connectors this way, hell you can even power the risers with it, it doesn't matter from my testing because the hot of one plug doesnt run into the neutral of another plug. Just turn on the PCI-E/riser power before you turn the mobo power on. It doesnt even matter if you switch them on and keep the mobo off, the GPU gets idle power but generally this is never enough power to even require the fans to turn on (passive cooling will keep the chip below 40).

[philipma1957]

he should not build the rig at all.

When he said he will have about 8 cards total.

[Apneal]

he should not build the rig at all.

When he said he will have about 8 cards total.

..and whats wrong with 8 cards now?

[JaredKaragen]

8 cards is a major speedbump in multiple GPU systems.   Usually requires driver/bios mods.


They are giving good info.   I suggest you read others' threads on multiple GPU systems.   Theres LOTS of good info and things to learn just by going through what they did first.

Also,
They also make connectors that link the motherboard power cables so they power on at the same time.   Its smart to have identical power supplies so they turn on at the same time or problems arise.

[Vann]

Dont know why you people make it so complicated.
http://www.parallelminer.com/product/hp-1200-watt-power-supply-kit-for-gpu-mining-platinum-94-zec-dash-eth/

Power the PCI-E power connectors this way, hell you can even power the risers with it, it doesn't matter from my testing because the hot of one plug doesnt run into the neutral of another plug. Just turn on the PCI-E/riser power before you turn the mobo power on. It doesnt even matter if you switch them on and keep the mobo off, the GPU gets idle power but generally this is never enough power to even require the fans to turn on (passive cooling will keep the chip below 40).

I looked in to using a server PSU, but decided against it after hearing they are too loud to use in a living space. I have enough noise already with all the auxillary fans I have going. The EVGA PSU I bought has an ECO mode that keeps the fan off untilit reaches 40% load. The fan is also barely audible.

The way he explained that the motherboard PSU should power all the risers was that otherwise it creates a situation where the 2 PSU's fight to regulate the 12V line.

https://bitcointalk.org/index.php?topic=1843586.msg18399752#msg18399752

[Apneal]

Its smart to have identical power supplies so they turn on at the same time or problems arise.

This simply isn't true. You power the cards first or at the same time. No problems arise.

I looked in to using a server PSU, but decided against it after hearing they are too loud to use in a living space. I have enough noise already with all the auxillary fans I have going. The EVGA PSU I bought has an ECO mode that keeps the fan off untilit reaches 40% load. The fan is also barely audible.

The way he explained that the motherboard PSU should power all the risers was that otherwise it creates a situation where the 2 PSU's fight to regulate the 12V line.

https://bitcointalk.org/index.php?topic=1843586.msg18399752#msg18399752

Server PSU's can get loud at high loads, but they're pretty quiet at ~70% or lower usage.

If you hooked up a card's riser and PCI-E power to a second PSU, there's no power connection between that card and the other PSU. The card will draw what it needs, there's no fighting to regulate anything, this is just silly.
Source: I run 8 GPU rigs with dual power supplies.

8 cards is a major speedbump in multiple GPU systems.   Usually requires driver/bios mods.


They are giving good info.   I suggest you read others' threads on multiple GPU systems.   Theres LOTS of good info and things to learn just by going through what they did first.

Also,
They also make connectors that link the motherboard power cables so they power on at the same time.   Its smart to have identical power supplies so they turn on at the same time or problems arise.

8 cards is zero issue if you have a motherboard that can handle it. You do NOT need to do some sort of BIOS or Driver mod. The only Driver mod required currently is you have to use Catalyst 16.x for RX 500 to run >5GPU, which just involves copying the drivers into a 17.4.3 installer. If you have a motherboard that supports it, it's just plug em in and turn it on.

[Vann]

Its smart to have identical power supplies so they turn on at the same time or problems arise.

This simply isn't true. You power the cards first or at the same time. No problems arise.

I looked in to using a server PSU, but decided against it after hearing they are too loud to use in a living space. I have enough noise already with all the auxillary fans I have going. The EVGA PSU I bought has an ECO mode that keeps the fan off untilit reaches 40% load. The fan is also barely audible.

The way he explained that the motherboard PSU should power all the risers was that otherwise it creates a situation where the 2 PSU's fight to regulate the 12V line.

https://bitcointalk.org/index.php?topic=1843586.msg18399752#msg18399752

Server PSU's can get loud at high loads, but they're pretty quiet at ~70% or lower usage.

If you hooked up a card's riser and PCI-E power to a second PSU, there's no power connection between that card and the other PSU. The card will draw what it needs, there's no fighting to regulate anything, this is just silly.
Source: I run 8 GPU rigs with dual power supplies.

8 cards is a major speedbump in multiple GPU systems.   Usually requires driver/bios mods.


They are giving good info.   I suggest you read others' threads on multiple GPU systems.   Theres LOTS of good info and things to learn just by going through what they did first.

Also,
They also make connectors that link the motherboard power cables so they power on at the same time.   Its smart to have identical power supplies so they turn on at the same time or problems arise.

8 cards is zero issue if you have a motherboard that can handle it. You do NOT need to do some sort of BIOS or Driver mod. The only Driver mod required currently is you have to use Catalyst 16.x for RX 500 to run >5GPU, which just involves copying the drivers into a 17.4.3 installer. If you have a motherboard that supports it, it's just plug em in and turn it on.

I think it may depend on the type of risers used. I know some USB risers have a voltage regulator and some do not. I use USB 6-pin risers and checked the outer pins on the USB cable that connects to the 1x PCI-E slot with a multiimeter. There was 3.3V coming from the motherboard. A PCI-E 1x slot also has 3 12V lines connected to it.

http://pinouts.ru/Slots/pci_express_pinout.shtml

[oktar]

Its smart to have identical power supplies so they turn on at the same time or problems arise.

This simply isn't true. You power the cards first or at the same time. No problems arise.

I looked in to using a server PSU, but decided against it after hearing they are too loud to use in a living space. I have enough noise already with all the auxillary fans I have going. The EVGA PSU I bought has an ECO mode that keeps the fan off untilit reaches 40% load. The fan is also barely audible.

The way he explained that the motherboard PSU should power all the risers was that otherwise it creates a situation where the 2 PSU's fight to regulate the 12V line.

https://bitcointalk.org/index.php?topic=1843586.msg18399752#msg18399752

Server PSU's can get loud at high loads, but they're pretty quiet at ~70% or lower usage.

If you hooked up a card's riser and PCI-E power to a second PSU, there's no power connection between that card and the other PSU. The card will draw what it needs, there's no fighting to regulate anything, this is just silly.
Source: I run 8 GPU rigs with dual power supplies.

8 cards is a major speedbump in multiple GPU systems.   Usually requires driver/bios mods.


They are giving good info.   I suggest you read others' threads on multiple GPU systems.   Theres LOTS of good info and things to learn just by going through what they did first.

Also,
They also make connectors that link the motherboard power cables so they power on at the same time.   Its smart to have identical power supplies so they turn on at the same time or problems arise.

8 cards is zero issue if you have a motherboard that can handle it. You do NOT need to do some sort of BIOS or Driver mod. The only Driver mod required currently is you have to use Catalyst 16.x for RX 500 to run >5GPU, which just involves copying the drivers into a 17.4.3 installer. If you have a motherboard that supports it, it's just plug em in and turn it on.

Since I suppose there is no mobo with 8x pci-e slots can you tell us which board extension/splitter are you using?