Dual 8-pin connector

[elisz]

Hello,

I'm planning an SLI build with two GTX 1080 FTW, I'm currently using a Seasonic X-850. It came with 2 single 8-pin connectors for the PCIe. It is currently connected on the 1st GTX 1080. The only cables left is 2x two 8-pin connectors that connects to a single slot on the PSU. Could I connect both of the 8-pins and not cause the second card to have less power? Would this complicate anything? Should I just use both the dual 8-pin connectors and put one on each PCIe slot for the second GPU?


It looks similar to this: https://images-na.ssl-images-amazon.com/images/I/31KYjeVjqRL._SX425_.jpg


Thank you.

 

[questkid44]

Depends mainly on the amperage and power distribution of your power supply, but I would think that such a high end seasonic unit would be able to handle that.

 

[clutchc]

The PSU comes with 4 x 6+2 pin. Enough for both cards. It is the wire size that matters. You are good.

 

[JackNaylorPE]

If not at 4k resolution, be aware that SLI on the 10xx series does not bring the returns of previous generations where the all games average was 70+% and the AAA demanding games had scaling well up in the 90%. Outside of 4k resolution, the 109xx series really isn't bringing much to the table

To my recollection, the Seasonic X-850, at least the ones I have installed have had four 8 pin power outlets. But your problem obviously is not the PSU, but the lack of proper cables. Up till now, the only time I have seen these silly 1 connector by 2 connector cables has been from EVGA.

The 1080 can certainly get by with just an 8 pin power connector. The biggest power draw I can recall seeing for a AIB 1080 was about 215 watts under peak gaming... which is enough for a PCIE slot (75 watts) and single 8 pin (150 watts). An 8 + 6 arrangement (300 watts) I think would certainly covers any overclock you can throw at it without physical modding.

The FTW however, for reasons I can't discern, chooses an 8 + 8 pin arrangement. For 8 + 6 I would have no worries with the following:

8 pin to 8 pin on card 1 using 8 pin cable
8 pin to 8 pin on card 2 using 8 pin cable
8 pin to 6 pins on cards 1 and 2 using an 8 x (2) 6 pin cable

I would not use a 2 x 8 pin by 8 pin cable simply because it leaves with one and capable of 2 x 150 watts and the other connector still only rated at 1 x 150 watts. I don't know enough about PSU design or GFX card design to know how power is shared between the two connectors.

If I understand you correctly, you have:

Two 8 pin x 8 pin cables
Two 8 pin x dual 8 pin cables.

I would use the two 8 pin x 8 pin cables for the top card and then
Use the TWO by x dual 8 cables for the 2nd card, leaving one of the two 8 pins on the dual side tangling as if it wasn't there.