Wireless adapter in PCI slot 5?

[halfpower]

I've seen a lot of motherboards on the internet that show pictures of them with a wireless adapter in the 5th PCI slot. Is there a particular reason why the 5th slot is so popular?

 

[imported_Bleh]

Probably because it gets less interference from video card and what not. This is only an educated guess tho.

 

[Peter]

If that WLAN adapter is a true PCI device, then there's no particular reason for plugging it into a certain slot. Other than keeping it away from interference, and also away from other stuff since it's obviously a strong emitter itself.