Question SLI not working

[alexozornin]

I have double Gigabyte GeForce GTX 1070 G1 and a Gigabyte AORUS 2Way SLI bridge. Using Windows 10 64 bit. Both of the cards are visible in device manager and NVidia control panel, SLI bridge has lights on. But SLI settings do not appear. I found that one of the cards is using bus PCI-E x16 gen3 and the other PCI-E x4 gen2. Does that matter? How can I fix this to use SLI? Do I need to somehow change it to x8-x8? Help, please.

 

[Mousemonkey]

What motherboard are you using?

 

[TJ Hooker]

SLI needs a minimum of PCIe x8 per card, so no that won't work. If your 2nd PCIe lane is 2.0 x4, that means they're coming from the motherboard chipset rather than the CPU. Only certain motherboards allow splitting the x16 lanes from the CPU into x8/x8, and will list SLI support in the mobo specs.

 

[alexozornin]

What motherboard are you using?

Using old Gigabyte GA-Z77P-D3. I see that it supports CrossFire technology, but nothing about SLI. Maybe, it's actually not supported by motherboard.

 

[Mousemonkey]

Gigabyte GA-Z77P-D3

Yes, that is a Crossfire only motherboard. To use your 1070's in SLi you will need to replace it.