Sorry for my bad English, and thanks for trying to help.

I use the PCI Express ports 1 and 3 and the computer restarts after 2 minutes.

The only way to hold the 2 gtx 295 was placed on ports 1 and 2 being very junstas.

I think it can be given the post pictures of your 16x and 16x ports 1-3.

It may be something to the picture that this bloked few buttons and some jumper.