Motherboard support for en7800gt dual...

Is there any motherboard in the market that fully supports two asus en7800gt dual graphics cards?

The Asus A8N32 SLI deluxe motherboard does not support dual gpu on pci express x16 slot one, but supports it on slot 2, is there a way to unlock it?

I already have the asus board and one of those cards.
it works fine on the second pci express slot, but on the first pci express slot, only one of the dual graphics chips are activated, trying to unloxk the second graphics chip....

Already read the article in Tom's hardware before buying the card among other reviews at extremetech.com, vr-zone.com, xbitlabs.com, hexus.net and guru3d.com. The report on Tom's hardware was slightly incorrect in regards to the OS reporting one GPU in slot one but having the power of two....... The asus motherboard manual indicates:

""due to nvidia nforce4 sli x 16 chipsest limitation, if you install a dual-GPU graphics card on the blue x 16 slot, it runs at x8 speed for one of the two GPUs.""

However, I believe that there is a way to modify so that both GPUs are accessible on either of the two slots. Either that, or pick up another motherboard that does the trick....