I have a 1200 watt power supply, but want to put 3 5850's on one mother board.
You can power 4x5870 with that 1200W monster. I have 2x5870 powered by 600W PSU, drawing 520W including PSU losses. Another PSU draw unnecessary power. 
Topic: 2 power supplies, one motherboard (Read 4628 times)
I've heard it is also important to connect the ground wires on the PSU:s, so they have the same ground level. Is that true? Do you need to do it even if you run both PSU:s off the same power bar?
Once you connect the second power supply to a card that is connected to the PCI-e bus of the motherboard the 2 PSU's are on the same ground level. However, it is better to directly ground the PSU's together because the ground pins of the PCI-e bus are only rated for so much current.
I've heard it is also important to connect the ground wires on the PSU:s, so they have the same ground level. Is that true? Do you need to do it even if you run both PSU:s off the same power bar?
Jump the Green and the adjacent black wire together......PS will then run.
This. I've tried it yesterday on my PSU and it works fine. Green wire is a Power On wire and you need to short it with any Ground (black) wires.
Here's what you need: http://www.burningissues.net/how_to/power/psu.htm . I haven't tried it but it should work.
.. Thank you..
Yup, I should have been over in the tech... I dont suppose I can move this 'block' of text from this 'chain' to the tech chain... lol
Yup, I should have been over in the tech... I dont suppose I can move this 'block' of text from this 'chain' to the tech chain... lol
Jump the Green and the adjacent black wire together......PS will then run.
There is something you can do which is called a "Wire Trick" or "Paperclip Trick" or you can buy a "2 to 1 Mobo Power connector". If you Google it I'm sure you can find a guide exactly how to do it.
BTW next time you should probably direct your question to Technical Support Forum.
BTW next time you should probably direct your question to Technical Support Forum.
Does anyone have a trick to get the 2nd power supply turned on as to power the 3rd and/or 4th card?
I have a 1200 watt power supply, but want to put 3 5850's on one mother board.
The only thing I can think to do is grab an old mother board, but then the old board might not be compatable with the 20 pin connector. ( my old boards are....well old.)
I have a 1200 watt power supply, but want to put 3 5850's on one mother board.
The only thing I can think to do is grab an old mother board, but then the old board might not be compatable with the 20 pin connector. ( my old boards are....well old.)
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