Running SLI on PCIe (16x) splitter

[ThetaSigma312]

I've been curious about something, but haven't been able to find out the answer anywhere else. Hypothetically, if you got a PCIe 16x splitter, and ran two (say, GTX 470) GPUs, would that allow for SLI? If the PCIe 16x is split two ways the lanes would be 8x 8x so there is no NVIDIA constraint there. Now I'm running from a reference of a microATX board in mind, and those don't generally support SLI (mainly because of one PCIe 16x slot).

In short, can you run SLI on a board that doesn't claim support simply by splitting the PCIe 16x?
I don't know of other hardware constraints against SLI besides bandwidth, so I would love to know the details.

 

[WyomingKnott]

It would depend on the board, but I'm going to bet against you. Keep in mind that there are boards with multiple PCI-e slots at 8x or 16x that still do not support SLI; it's a feature that has to be baked in. Why would a vendor bake it in to a board not intended to support two cards?