X38/X48 based boards can get SLI

[virtualrain]

That is not necessarily true. If you go and get a 9800X2, or a 7900X2 or any other variant of a dual chip card, it enables SLI to do that right? Or is that the part I am getting wrong?

If I have that part right, what I wonder is, once the SLI is enabled for a dual-die card, will it then work with a second card?

You are correct...dual PCB cards such as the GX2 series do use SLI.

However, I'm sure quad SLI is not possible on an Intel Board.

How they differentiate is surely based on the driver detecting the card and chipset and determining what is and is not possible.

The bottom line is that the 9800GX2 is giving Intel SLI... if rumors are correct, the equivalent of dual 8800GTS 512MB cards. In fact, you get SLI with only one fan/cooler instead of having the noise of two fans... What more do you want?

If everyone with an Intel motherboard was serious about wanting SLI, they would buy a GX2 and NOT buy an nVidia POS motherboard... this would send a message to nVidia that there is a real market for SLI on Intel while you also benefit from having the most kick-arse graphics solution available. Whether they offer it in discrete cards or two high-end cards sandwiched together... do you really care?