Are 6-pin to 8-pin adapters safe for GPUs?

[Athlonite]

I use dual 6 pin input to single 8 pin output for years now, no issues. I did find one adaptor that was not fully wired.

that's doing it the right way but a single 6pin to single 8pin is the wrong way specially if the wire gauge is poor

 

[Vya Domus]

OK, let's clarify.

The 6-pin connector is indeed rated for 75W and 8-pin one for 150W, they are not equivalent, that's a fact. The reason these adapters exist is because some GPUs which are below below 150W (75W motherboard + 75W PCIe) would be fine with a 6-pin connector but may ship with an 8-pin, so in reality these GPUs would work fine with an adapter. The idea is that it's very rare for a PSU to only have a 6-pin connector and be powerful enough, those would be really old PSUs and modern ones practically all have 6+2 connectors and so manufacturers put 8-pin connectors by default even when it's not necessary.

The 570 is a 120W GPU, that's why they gave you the adapter but a higher TDP card would likely never come with such a thing. Overall it will be fine but you should never use a 6-pin to 8-pin adapter with a >150W GPU. That being said I reckon that's a really old PSU and it doesn't have much power, I would be more concerned about that.

Worst case scenario is that you could destroy hardware or start a fire. It's your risk.

I mean that's the worst case scenario for literally every system.

 

[cyberloner]

i just plug in the powersupply 6pin into 8pin slot of rx580 too..

 

[hat]

It's fine for a card like the rx570. Don't try it with a 2080ti.

Imagine Molex to 6 pin to 8 pin adapter chains on a 2080ti...

 

[dexgo10]

I think you should start with a PSU upgrade first.

I know it´s the best choice, but it´s complicated too, in my country I can´t find a reliable brand of psu´s

i just plug in the powersupply 6pin into 8pin slot of rx580 too..

And it´s working fine your gpu?

OK, let's clarify.

The 6-pin connector is indeed rated for 75W and 8-pin one for 150W, they are not equivalent, that's a fact. The reason these adapters exist is because some GPUs which are below below 150W (75W motherboard + 75W PCIe) would be fine with a 6-pin connector but may ship with an 8-pin, so in reality these GPUs would work fine with an adapter. The idea is that it's very rare for a PSU to only have a 6-pin connector and be powerful enough, those would be really old PSUs and modern ones practically all have 6+2 connectors and so manufacturers put 8-pin connectors by default even when it's not necessary.

The 570 is a 120W GPU, that's why they gave you the adapter but a higher TDP card would likely never come with such a thing. Overall it will be fine but you should never use a 6-pin to 8-pin adapter with a >150W GPU. That being said I reckon that's a really old PSU and it doesn't have much power, I would be more concerned about that.



I mean that's the worst case scenario for literally every system.

The gpu that I want to buy, rx 570 MSI, is a 150w. It would be risky, right? because I´m in the limit

 

[Cranky5150]

Upgrade that PS to be on the safe side i would say.

 

[Deleted member 67555]

It's fine for a card like the rx570. Don't try it with a 2080ti.

Imagine Molex to 6 pin to 8 pin adapter chains on a 2080ti...

I got 2 Molex to 8 pin PCI-E adapters with my Zotac 2080s...I was shocked..fo reals...shocked

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[hat]

Oh my... that's bad

 

[Vya Domus]

The gpu that I want to buy, rx 570 MSI, is a 150w. It would be risky, right? because I´m in the limit

Your problem is not the adapter, on paper everything adds up fine but PSU is old and lacks power.

 

[cyberloner]

I know it´s the best choice, but it´s complicated too, in my country I can´t find a reliable brand of psu´s


And it´s working fine your gpu?


The gpu that I want to buy, rx 570 MSI, is a 150w. It would be risky, right? because I´m in the limit

yes perfectly can gaming.... no plug in no display ..... it is old hack before 8 pin slot come....
if your gpu need more power and you give lower power to it ... it won't damage your gpu anyway... try and test...

 

[MrGRiMv25]

I trust in the brand, but the only thing risky is that my psu has seven years

I know what you mean, if you don't feel safe trusting the age of the supply then a new one might be in order. Better to err on the side of safety.

 

[blakj4k]

I have a similar problem. My PSU is 600 Watt so its sounding like a viable option if I were to purchase a card which came supplied with an 6-pin to 8-pin adapter. Also isn't there a way to turn my 6-pin into an 8-pin by way of a molex adapter. I cant seem to find a 'molex to 2-pin' whats my best option?
Asus P8Z77-V LX2, intel core i5 2470, 8GB Corsair Vengeance, 2 x 1TB SATA HDD + 500GB SATA HDD, Linux Mint 19 MATE.

 

[Keullo-e]

I have a similar problem. My PSU is 600 Watt so its sounding like a viable option if I were to purchase a card which came supplied with an 6-pin to 8-pin adapter. Also isn't there a way to turn my 6-pin into an 8-pin by way of a molex adapter. I cant seem to find a 'molex to 2-pin' whats my best option?
Asus P8Z77-V LX2, intel core i5 2470, 8GB Corsair Vengeance, 2 x 1TB SATA HDD + 500GB SATA HDD, Linux Mint 19 MATE.

Something like this? Should work fine.

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[John Naylor]

I use dual 6 pin input to single 8 pin output for years now, no issues. I did find one adaptor that was not fully wired.

6 - Pins are rated for 75 watts
8 - Pins are rated for 150 watts

2 x 75 = 150 OK ...

A 250 pound hoist might be tested at 750 pounds ... that doesn't mean i'd lay under a 400 lb engine while that hoist was holding it.

I remember the RX 480s with 6 pin connectors ... when they couldn't pull enough juice from the cable, they pulled it from the PCI slot.... few MoBos went down as a result.

 

[kiriakost]

The wires are not the issue in that cable; the contact rating is.

Those contacts are good for7A; 3 contact to 4 contact is significant; 21 to 28A.

This is the most close to the truth answer so far.
MOLEX mentioning 9A MAX specification for their PCI-E female pin.
Therefore 7A as constant current this sounds as very reasonable math.

6 - Pins are rated for 75 watts
8 - Pins are rated for 150 watts

2 x 75 = 150 OK ...

6 - Pins are rated for 75 watts
Lets make it amperes, 75W / 12V = 6A per pair this times three by 12V = 75W again = three pairs of wires.

8 - Pins are rated for 150 watts
Four pairs of wires (8pin): This is 6A (per pair) times by four = 24A times 12V = 288W (single 8 Pin)

I would expect from NVIDIA to deliver true power specifications about dedicated 8 Pin usage, because the math of 150W this does not have a valid stand point.

 

[ThrashZone]

Hi,
Corsair pigtails off 6 to make 8 pin vga cables 6+2 might be only on low end I've only returned one 850w
EVGA doesn't 8 wire all the way from the psu you can use only 6 because it's split 6+2