There is now rudimentary support in 10.5.5 Nvidia kexts for the 9800 GX2. It does not really change much though, still does not want to boot from PCIe slot 1. Card still has to go in slot 2. Also, the new drivers only work with GFX strings and apparently not NVInject or Natit.

That's a great leap!

By the way Steve, I still haven't figure out both in windows and mac's gfx utility on how to find the pci root address... please tell me how you find yours...

Hi Alex,

Go into windows device manager. Double click your graphics card then click the "Details" tab at the top. From the drop down box, select "Location Paths". This will show the PCI address for one of the cards. Then do this again for the second half of the card (that will show up directly under the first card in device manager) - Double click it, select "Details" & "Location Paths" etc again.

Good Luck.

no wonder I can't find it for so long... "location paths" is only viewable in vista, xp doesn't even have that option in the drop down menu...

I will let you know when I have time to install vista... but I highly doubt it's different from what you already have... I mean your Asus X48 board is almost the same as mine.

Sorry 'bout that, I looked on my sons Vista based computer.