9x RX580 Power Setup Inquiry - Want to avoid burned house

[Dankatron]

Hey guys, seen so many posts about how to properly power risers and that SATA doesn’t have the rating to support “UP TO 75 watts that some cards may or may not draw, maybe, sometimes.”


I have been running the 9x 580 rig on modded rom, dual mining, and the secondary PSU (1000w) pulls 1050 at the wall (6 cards + 6 risers are the only pieces on this PSU)

1- How can I determine if my specific card will attempt to draw more than spec from the pci slot instead of the supplied 8-pin?

2- How can I power these 6-pin risers “safely” without running out of PSU ports? I don’t mind buying cables but there’s no way I can use 1 cable -> 1 riser -> PSU

3 - Powering two GPUs per 8-pin (I.e. one cable into PSU that splits into two at the end, good to go?  No aftermarket splitter)

Any insights are appreciated, everything seems to be working fine but I don’t want the house burning down haha

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[1715495783]

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[1715495783]

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[leonix007]

Hey guys, seen so many posts about how to properly power risers and that SATA doesn’t have the rating to support “UP TO 75 watts that some cards may or may not draw, maybe, sometimes.”


I have been running the 9x 580 rig on modded rom, dual mining, and the secondary PSU (1000w) pulls 1050 at the wall (6 cards + 6 risers are the only pieces on this PSU)

1- How can I determine if my specific card will attempt to draw more than spec from the pci slot instead of the supplied 8-pin?

Sorry, I'm not sure what you meant on this, PCI slot is not used by GPU only the PCI-e

2- How can I power these 6-pin risers “safely” without running out of PSU ports? I don’t mind buying cables but there’s no way I can use 1 cable -> 1 riser -> PSU

Sata/molex is safe for 1 riser on each cable, it could handle watts for 1 riser.

3 - Powering two GPUs per 8-pin (I.e. one cable into PSU that splits into two at the end, good to go?  No aftermarket splitter)

I'd use this setup on my 2 Rigs of RX 480, its safe, been mining for a year now.

[Dankatron]

Hey guys, seen so many posts about how to properly power risers and that SATA doesn’t have the rating to support “UP TO 75 watts that some cards may or may not draw, maybe, sometimes.”


I have been running the 9x 580 rig on modded rom, dual mining, and the secondary PSU (1000w) pulls 1050 at the wall (6 cards + 6 risers are the only pieces on this PSU)

1- How can I determine if my specific card will attempt to draw more than spec from the pci slot instead of the supplied 8-pin?

Sorry, I'm not sure what you meant on this, PCI slot is not used by GPU only the PCI-e

2- How can I power these 6-pin risers “safely” without running out of PSU ports? I don’t mind buying cables but there’s no way I can use 1 cable -> 1 riser -> PSU

Sata/molex is safe for 1 riser on each cable, it could handle watts for 1 riser.

3 - Powering two GPUs per 8-pin (I.e. one cable into PSU that splits into two at the end, good to go?  No aftermarket splitter)

I'd use this setup on my 2 Rigs of RX 480, its safe, been mining for a year now.

Meant to refer to it as PCI-E, not sure if there's a way to measure how much the card actually tends to pull from the slot.

I'm currently running SATA->6pin for 2 risers per rail, perfectly stable and not warm to the touch but I'd like to quantify this somehow.

[Vann]

In a dual PSU setup you can figure out how much is being used by risers if you use the main PSU connected to the motherboard to power all the risers and use a secondary PSU to power all the VGA inputs on the cards. Then subtract 60-80 W for the motherboard from the total power of the primary PSU and you will have how much is being used by the risers. In my experience having a dual and triple PSU setup as mentioned with RX 570/580's, risers will use between 45-50 W each when dual mining and about 60 W on Linux.

[Dankatron]

In a dual PSU setup you can figure out how much is being used by risers if you use the main PSU connected to the motherboard to power all the risers and use a secondary PSU to power all the VGA inputs on the cards. Then subtract 60-80 W for the motherboard from the total power of the primary PSU and you will have how much is being used by the risers. In my experience having a dual and triple PSU setup as mentioned with RX 570/580's, risers will use between 45-50 W each when dual mining and about 60 W on Linux.

I thought it was frowned upon to power risers on a different PSU than the card?

[Vann]

This has been discussed many times. I'm in the camp that you shouldn't mix power sources to the devices connected to motherboard. I can also say the motherboard, cards and risers are all fine after running 8+ months like that.

https://bitcointalk.org/index.php?topic=2614092.msg26608162#msg26608162