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1st Time setup PCIe 2.0 crossfire please help...

I'M 1st time setup ATI crossfire x
My motherboard is biostar TA790GX3 A2+.

Using this card in my motherboard Sapphire R7 260X (OC) x2 card

If using PCIe 2.0 crossfire the PCIe bug card is x8 & x8 right.
but in my windows 7 pro ATI ccc show the 1st bug card is x8 2nd card is x4
:(
In my bios below setting.
GFX Port 1
-Gen2 High Speed Mode
-Auto (selected)
-Disabled
-Advertised RC
-Sys. Initiated
-Link ASPM
-Disabled (selected)
-LOs
-L1
-LOs & L1
-Link Width
-Auto (selected)
-x1
-x2
-x4
-x8
-x16
Slot Power Limit, w
75
Compliance mode
Disable (selected)
Gen2
GEN1

GFX Port 2
-Gen2 High Speed Mode
-Auto (selected)
-Disabled
-Advertised RC
-Sys. Initiated
-Link ASPM
-Disabled (selected)
-LOs
-L1
-LOs & L1
-Link Width
-Auto (selected)
-x1
-x2
-x4
-x8
Slot Power Limit, w
75
Compliance mode
Disable (selected)
Gen2
GEN1
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