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B00tDisk,
Actualy, the solution you mentioned was created by ULi (the chipset maker). I had an EPOX and an Asrock motherboard based on that.
And the neat thing was both PCIe slots were X16 (as opposed to SLi's X8 slots at the time).
But Nvidia quickly updated its drivers so the software patch that enabled this no longer worked.
Then Nvidia bought ULi outright (no doubt gaining some talented engineers, ULi Southbridges were very common on ATI motherboards before the SB600 was introduced).