Dell Optiplex 760 SFF

​Hi,​

​I'm trying to use a Intel Quad NIC adapter (pcie x4) in an Optiplex 760 SFF, but it wont recognize it. It's this card I think (​​http://www.intel.com/content/www/us/en/network-adapters/gigabit-network-adapters/pro-1000-pt-qp.html​​)​

​I've tested it on other motherboards from Asus, MSI, Zotac, so I know the Quad NIC is working.​

​It doesnt show under bootinfo nor in any OSes I've tested on the 760. (Windows 7/8 or linux (arch/debian/ubuntu)​

​Any ideas on how to fix it?​

​Is the mobo only expecting a graphics card in the pcie? ​

​-Thomas​