Is it safe to use a 6pin to 8pin pcie adapter?

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Nov 27, 2018
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i recently upgraded my old rx 480 to an rx 64 as it was on sale however the header on my psu only had one 6pin + 2pin header and a single 6pin header. So i bought an adapter for it as the card needs two 8pin headers, is this safe?

according to pc part picker, my system should only ever require 440 watts and my power supply supports 500 watts so is this all good?

system specs:https://uk.pcpartpicker.com/list/RHvkyX

my psu is a "LITEON PS-7501-5"
 

Karadjgne

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Rating is 5A per pin. There's 3x 12v, 2x sense and 3x ground in an 8pin. 12v x 5A = 60w x 3 = 180w at maximum for an 8pin, but general limits put it at 150w. A 6pin has 2x 12v, 1x sense, 3x ground for a total of 120w but is generally rated at 75w. Try pushing @7A per pin and the connector starts to melt. If the 18ga wire is longer than @12" the middle or any kink is what'll melt first. 1 foot of 18ga can safely handle @8A at 12vDC, and the amperage rating goes down fast for longer lengths.

Beyond that, that liteon is a tri-rail disaster with 12,14 and 18w rails for 432w max, of which you'd be lucky to get 350w before the thing cooks when that 12A rail melts.

It's desperately in need of replacement before it fries and takes out not only the gpu, but most likely the motherboard as well.
 
Nov 27, 2018
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is it very urgent that i dont use the adapter? Like is my card gonna fry any minute and i cant wait for the new psu upgrade to come?
 

iamacow

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Eh I used splitters and 6-8pins for mining. Just make sure you get the good quality ones and not the crappy 24 AWG wire. People don't realize the extra 2pins are just grounds (technically one is a sense pin). If a 8Pin 18AWG cable can go safely to 300watts, so can a 6pin.

But if you use 6pin 24AWG wire it will melt and probably catch fire.

If you are just going from 6 to 8pin, it won't make a difference. the 8pin is still a 6pin at heart. But once again get 18AWG cables, no 24AWG or it will melt.
 

Karadjgne

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Rating is 5A per pin. There's 3x 12v, 2x sense and 3x ground in an 8pin. 12v x 5A = 60w x 3 = 180w at maximum for an 8pin, but general limits put it at 150w. A 6pin has 2x 12v, 1x sense, 3x ground for a total of 120w but is generally rated at 75w. Try pushing @7A per pin and the connector starts to melt. If the 18ga wire is longer than @12" the middle or any kink is what'll melt first. 1 foot of 18ga can safely handle @8A at 12vDC, and the amperage rating goes down fast for longer lengths.

Beyond that, that liteon is a tri-rail disaster with 12,14 and 18w rails for 432w max, of which you'd be lucky to get 350w before the thing cooks when that 12A rail melts.

It's desperately in need of replacement before it fries and takes out not only the gpu, but most likely the motherboard as well.
 
Nov 27, 2018
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:ouch:
 

iamacow

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He isn't wrong. But people make it sound a lot worse. 6-8pin isn't the end of the world with 18AWG. To be fair all the splitter I used for mining where 3 inchs long max. They got a little warm after a few weeks.
 
Sep 26, 2020
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Hello, same question:
Would it be adequate to use 8pin from psu with another 6pin to 8pin adapter to power 1080ti? Psu is chieftec 600 14cft, cpu ryzen 3600, 5fans 2 sticks of ram, 2 ssd ?
Thank you so much !
 

USAFRet

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Hello, same question:
Would it be adequate to use 8pin from psu with another 6pin to 8pin adapter to power 1080ti? Psu is chieftec 600 14cft, cpu ryzen 3600, 5fans 2 sticks of ram, 2 ssd ?
Thank you so much !
  1. This is a 2 year old thread.
  2. Adapters are almost never a good idea.
Please start a new thread. Please list ALL the parts involved, and what you're planning to do.
Post in the Power Supply Forum.
 
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