Bottom PCI-E slot not working!

bobby555

Honorable
Feb 9, 2014
17
0
10,510
Hey guys im trying to crossfire my two, 7850's on my p8z77-v pro motherboard. I know for sure that both the cards work seeing as i swapped them around and both work in the top slot however they do not work in the bottom slot.

The bottom one powers up however it is not detected on the BIOS or the device manager.

Could i please have some help into making the bottom slot work.

The motherboard is BRAND new!

Thanks,
Bobby555
 
Check your mobo manual, some mobos have "switches" to enable/disable secondary PCI-E slots, when disabled they can give all x16 PCI-E lanes to primary slot, when enabled it will divide the lanes among both slots in order to get secondary one to work.
 

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