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Author Topic: Dedicated PSU for GPUs?  (Read 1341 times)
polymorpher
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July 23, 2011, 02:06:27 PM
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My PSU refuses to provide power to GPUs if 24pin and 8pin cable are not connected to motherboard. Is there anyway to trick the PSU so I could have a dedicated PSU for GPUs?
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Xephan
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July 23, 2011, 02:16:16 PM
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My PSU refuses to provide power to GPUs if 24pin and 8pin cable are not connected to motherboard. Is there anyway to trick the PSU so I could have a dedicated PSU for GPUs?

ATX PSU are turned on when Pin 14 on the 24pin connector is pulled to ground. Pin 14 is usually wired with a green wire. So the simplest way to make this work, you just need to use a wire or something to connect that to any ground pin (black wire). A better way is to connect it to your main PSU so that it will turn on/off accordingly as well.

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polymorpher
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July 23, 2011, 02:45:09 PM
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My PSU refuses to provide power to GPUs if 24pin and 8pin cable are not connected to motherboard. Is there anyway to trick the PSU so I could have a dedicated PSU for GPUs?

ATX PSU are turned on when Pin 14 on the 24pin connector is pulled to ground. Pin 14 is usually wired with a green wire. So the simplest way to make this work, you just need to use a wire or something to connect that to any ground pin (black wire). A better way is to connect it to your main PSU so that it will turn on/off accordingly as well.


Many thanks. Do you mean I can connect the "power on" pin to a ground pin on the same 24 pin connector (or any ground pin on any component)? I know nothing about PSU. Just want to make sure it is safe, so I wouldn't short circuit my PSU.
Xephan
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July 23, 2011, 02:53:16 PM
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My PSU refuses to provide power to GPUs if 24pin and 8pin cable are not connected to motherboard. Is there anyway to trick the PSU so I could have a dedicated PSU for GPUs?

ATX PSU are turned on when Pin 14 on the 24pin connector is pulled to ground. Pin 14 is usually wired with a green wire. So the simplest way to make this work, you just need to use a wire or something to connect that to any ground pin (black wire). A better way is to connect it to your main PSU so that it will turn on/off accordingly as well.


Many thanks. Do you mean I can connect the "power on" pin to a ground pin on the same 24 pin connector (or any ground pin on any component)? I know nothing about PSU. Just want to make sure it is safe, so I wouldn't short circuit my PSU.


You can connect the 24pin to any ground pin, there are pull down resistors to prevent shorts. Anyway you can find guides online like this
http://www.overclock.net/faqs/15751-info-can-i-use-two-power.html

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jthermit
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July 23, 2011, 02:59:58 PM
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1. Connect any load to your PSU (6-pin cable to your video card, for example )
2. Connect a power cable to your PSU and turn on the switch on it (if it exists)
3. Then connect together green and any black pin of 24-pin ATX connector. I usually use a unbent metal paper-clip.
PSU will be in work until you disconnect green and black pins Smiley
Xephan
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July 23, 2011, 03:07:21 PM
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3. Then connect together green and any black pin of 24-pin ATX connector. I usually use unbended metal paper-clip.

Unbent paper clips are my favourite for doing this too Cheesy

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