Which motherboard has 4 1x PCI-Express slots

I need a motherboard (perferably a server board, although I'm open to options) that has 4 mini-pci-e 1x slots. This is for a radar sensor project I am working on and I'm drawing a blank.

Anybody know of such a beast?

The Nvidia 790i boards have 3x 16x PCI + 1.0x PCI.

That's the only thing I can think of that would give you 4 slots.