Gigabyte z68 with 2x 290?

lazarba

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WIll my GA-Z68P-DS3 support a 2 way crossfire R9 290?
This is what my Mobo has :

1 x PCI Express x16 slot, running at x16 (PCIEX16)
* For optimum performance, if only one PCI Express graphics card is to be installed, be sure to install it in the PCIEX16 slot.
1 x PCI Express x16 slot, running at x4 (PCIEX4)
2 x PCI Express x1 slots
(All PCI Express slots conform to PCI Express 2.0 standard.)
2 x PCI slots
http://www.gigabyte.com/products/product-page.aspx?pid=3899#sp
.

The 2 PCI's on the bottom are far smaller than the other two. I assume those are the PCI x1 ?
Also what is the difference between them?

Another thing that concerns me is that a R9 290 takes 2 slots. Does that mean that 1x 290 will will take both of the PCIx16?
 

lazarba

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But at least one R9 290 will run okay I take it?