My PSU do not have PCI-E power cable

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popobe

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Aug 29, 2013
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Need help.

I have 500W PSU without PCI-E power cable. I need to power up my ASUS GTX 680, which need 300W additional 6+8 pin PCIe power - from the wesbite. So, can I use molex 4 pin to PCI-E power connector to connect to my GPU? Is it enough?
 
Solution
J
When i said molex to 6 or 8 pin i was reallly saying 2 Molex to 6pin or 2 Molex to 8 Pin, i never see a single Molex to 6/8 Pin conector.

In yor current PSU you could use 2 Molex (- 2x molex 4-pin) to power the 8pin connector, but then have a couple of little problems:

- Need to ensure that the - 1x molex 4-pin + 1x sata is in a second diferent rail
- To power the 6 pin you really only have a single Molex, the problem is that a single molex is 60w and the 6pin 75w you could use a second molexfrom the sata to be safe.
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popobe

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Aug 29, 2013
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one 20A and one 18A
 
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juanrdp

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Nov 7, 2012
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For 300w you need 25A (at 12v), as you have two diferent rails it would work if you put a molex to 8pin in one rail and the molex to 6 pin in the second rail, if you put both in the same rail your PSU isn't enought.
 
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popobe

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Aug 29, 2013
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my PSU got 2 output for molex :
- 2x molex 4-pin
- 1x molex 4-pin + 1x sata

i read somewhere it is dangerous to use 1 molex 4pin to PCI-e 6 pin, and they recommend use 2 molex to PCI-e 6 pin.

is there any molex 4pin to 8 pin PCI-e connector sell in market?

What you recommend to get my GPU works? Thanks very much :)
 
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juanrdp

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Nov 7, 2012
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When i said molex to 6 or 8 pin i was reallly saying 2 Molex to 6pin or 2 Molex to 8 Pin, i never see a single Molex to 6/8 Pin conector.

In yor current PSU you could use 2 Molex (- 2x molex 4-pin) to power the 8pin connector, but then have a couple of little problems:

- Need to ensure that the - 1x molex 4-pin + 1x sata is in a second diferent rail
- To power the 6 pin you really only have a single Molex, the problem is that a single molex is 60w and the 6pin 75w you could use a second molexfrom the sata to be safe.
 
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Solution
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popobe

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Aug 29, 2013
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haha thanks so much, now i got it.

so i just need to find:
1. 2 Molex to 8pin PCI-e
2. 2 Molex to 6pin PCI-e
3. 1 sata to 4pin molex

Correct?
 
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popobe

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Aug 29, 2013
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yes i know this would be better solution earlier, and i already own a compatible PSU for my graphic card but i dont bring it back home from college as it heavy. Just want to try find other solution without buying a new 2nd PSU, so i want to try if there possible way to use my old PSU at home. Thanks for the recommendation :)
 
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popobe

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Aug 29, 2013
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yes both of them are in different rail as i checked it and they are free to use

thanks so much you helped me lot on understanding these power supply things! :D
 
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