Repin 8pin to 6pin PCI-E

Sam1990 · Jan 27, 2018

I have a 1080Ti on the way and noticed it requires an 8-pin and 6-pin PCI-E connector for the power. My current PSU only has two 8-pin plugs that don't break off into a 6-pin. I'm having trouble finding an adapter to convert it, as most I find are 8-pin male to 6-pin female but I need the other way around.

Would it be possible to just remove the pins from the 8-pin and insert them in a 6-pin connector or just remove the other two pins and shave down the connector?

shilka · Jan 27, 2018

What PSU does not have break away 8 pins?

Sam1990 · Jan 27, 2018

shilka said:
What PSU does not have break away 8 pins?

Apparently mine haha. It's a Silverstone 800W if I remember correctly, it's several years old (6-7+), I know I need to upgrade to something newer and better but for the time being I'd like to just leave this one in.

CynicalUnicorn · Jan 27, 2018

Can you fit the 8-pin cable into the 6-pin socket? The plugs are keyed so you won't cause a short, but there might be something blocking the two extra pins.

Officially, the 8-pin connector adds two extra grounds and one extra +12V. However, in practice, 6-pin cables often include the middle +12V pin anyway. If the device using it adheres to the official spec and leaves that pin unconnected, there's no problem. If the PSU adheres to the official spec and leaves out that wire, there's no problem. If both the device and PSU add it in, you've got 50% more current available and still no problems. :thumb:

shilka · Jan 27, 2018

The only model SilverStone has in 800 watt is the Decathlon so sure its not an 850 watt?
Which SilverStone model do you have?

chris89 · Jan 27, 2018

You can plug the 6 pin female into your 8 pin male no issue & just run the 6+2 pin to the gpu on the 6 pin only...

https://www.ebay.com/itm/6-Pin-PCI-...-6-2-Pin-PCIe-M-Power-cable/122760580936?hash=item1c9519cf48:g:MiUAAOSwY45UPV~2

Sam1990 · Jan 27, 2018

CynicalUnicorn said:
Can you fit the 8-pin cable into the 6-pin socket? The plugs are keyed so you won't cause a short, but there might be something blocking the two extra pins.

Officially, the 8-pin connector adds two extra grounds and one extra +12V. However, in practice, 6-pin cables often include the middle +12V pin anyway. If the device using it adheres to the official spec and leaves that pin unconnected, there's no problem. If the PSU adheres to the official spec and leaves out that wire, there's no problem. If both the device and PSU add it in, you've got 50% more current available and still no problems. :thumb:

That's what I was hoping I can do but I cannot confirm yet as I haven't received the GPU, but looking at the pictures of the GPU the 6-pin connection is to the right of the 8-pin connection and looks to me like the 8-pin connector would have to overhang to the left if plugged into the 6-pin connection which wouldn't fit. I may be wrong though, it's difficult to see the pinouts.

shilka said:
The only model SilverStone has in 800 watt is the Decathlon so sure its not an 850 watt?
Which SilverStone model do you have?

I'll get back to you when I get home and can check, it may in fact be 850W.

chris89 said:
You can plug the 6 pin female into your 8 pin male no issue & just run the 6+2 pin to the gpu on the 6 pin only...

https://www.ebay.com/itm/6-Pin-PCI-...-6-2-Pin-PCIe-M-Power-cable/122760580936?hash=item1c9519cf48:g:MiUAAOSwY45UPV~2

That should work, guess I didn't think of it that way lol.

Revan654 · Jan 27, 2018

Sam1990 said:
I have a 1080Ti on the way and noticed it requires an 8-pin and 6-pin PCI-E connector for the power. My current PSU only has two 8-pin plugs that don't break off into a 6-pin. I'm having trouble finding an adapter to convert it, as most I find are 8-pin male to 6-pin female but I need the other way around.

Would it be possible to just remove the pins from the 8-pin and insert them in a 6-pin connector or just remove the other two pins and shave down the connector?

You would pin it something like this(This is based off my own PSU, test your cable before plugging it in to avoid hardware damage):

1 -> 3
2 -> 2
3 -> 1
4 -> 4
5 -> 8
6 -> 7
7 -> Not Used
8 -> Not Used

Connectors Needed: 8-Pin (PSU Side) & 6-pin (GPU Side)

^Final voltage test, yours may be a bit different since I use gold plated terminals and stock cables are usually tin plated.

------

If you need more help with the pin layouts I would check the following thread: http://www.overclock.net/forum/1797...et/forum/17973-cables-sleeving/1420796-repository-power-supply-pin-outs-98.html

Lady Fitzgerald · Jan 27, 2018

Are you sure that 8 pin is PCI-e power and not EPS (CPU) power? They are not interchangeable.

Sam1990 · Jan 28, 2018

Lady Fitzgerald said:
Are you sure that 8 pin is PCI-e power and not EPS (CPU) power? They are not interchangeable.

Yes, positive. I don’t believe you can plug a PCI-E into the EPS plug.

I just realized though the PSU is supposed to have 2 x 8pin and 4 x 6pin PCI-E connections however the 6pin wiring was removed when it was sleeved so there wasn’t so much extra cables that weren’t being used.

I’ll just get one of the adapters for now until I get a new PSU lol

Sam1990 · Feb 1, 2018

Stupid question, but can I just remove the pins from the 8-pin connector and put them into a 6+2 pin connector using the same exact pinouts?

chris89 · Feb 1, 2018

Sam1990 said:
Stupid question, but can I just remove the pins from the 8-pin connector and put them into a 6+2 pin connector using the same exact pinouts?

Sure

Repin 8pin to 6pin PCI-E

Sam1990

shilka

Sam1990

CynicalUnicorn

shilka

chris89

Sam1990

Revan654

Lady Fitzgerald

Sam1990

Sam1990

chris89

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