Clarification on expansion slots please

[GrimnirBuilder]

I might decide to get 2 graphics cards and so when deciding on motherboard I look at the PCI expansion slots section, bandwidths and the rest of it. Don't know exactly what it all means, I just know that I want 2x 16.

This is what one motherboard says
3 x PCI (32 bit)
2 x PCIe 2.0 x1
2 x PCIe 3.0 x16
Does that mean it will run 2 graphics cards x16 each and both? Don't want one of them being inefficient otherwise I just stick with 1 graphics card

This is what another motherboard says
4 x PCIe 2.0 x1
1 x PCIe 3.0 x16
1 x PCIe 3.0 x4
1 x PCIe 3.0 x8
Does that mean it will run 3 graphics cards at x16, x8 and x4? <<< Don't want.

Can anyone recommend an "efficient" motherboard that has the 2x 16 SLI option without the extra PCI 2/3 slots, because I have no intention of ever getting 3 graphic cards

 

[GrimnirBuilder]

It will be 1150 motherboard, probably Z97 (that's Z chipset right?) MSI Z97 is the one that's at front at the moment. There are a few variations and would want to get the best reviewed of the ones that have the 2x 16 option I talking about. BUT I discover that you can't SLI 2 of the graphics cards I was considering getting so now I might just get 1 newer/faster graphics card and that means I have to consider all the good motherboards I ruled out because they not have the right expansion slots.