crossfire mode on crosshair v formula motherboard

[ja14]

i have the crosshair v formula motherboard and i am currently running two hd 7770s in crossfire mode. i was just wondering if i have to use the top two pci express ports or can i use any of the four. in other words which of the ports are pci express x16? thanks.

[Tradesman]

Normally would want to use the 2 closest to the CPU

[ja14]

ok because i just feel like the fan on the top card is really close to the bottom card.

[Tradesman]

Yeah, that happens, but the air should clear off to the top of the card