Can't enable SLI with Xonar phoebus installed

[TimoViBrtiannia]

Hello,

I have 2 GTX 780's in my System and one Xonar Pheobus whitch is installed in the 3 PCI slot. My grafics cards work fine but I have no option to enable the sli support. But when I remove my phoebus from my system I can enable SLI whats wrong there?

Mainboard: Asrock Z87 Professional
CPU: I7 4770K
GPU1: GTX 780
GPU2: GTX 780
SoundCard: Asus ROG Xonar Phoebus

[Nate152]

hello TimoViBrtiannia

If you have the sound card in the third pcie slot, it drops the pcie lanes to x8 x4 x4. Nvidia gpu's need x8 to run.

Try connecting it in the pcie x 1 slot.

[TimoViBrtiannia]

Hi,
The first gpu uses 8x lanes and the second one 4x lanes

[TimoViBrtiannia]

But when I put the soundcard in the first slot, i can't connect the sli bridge because its to short

[Nate152]

the pcie x1 slot is the shortest slot and is black, it's just big enough for your sound card to fit into.