I just recently bought 2- 650TiBoosts for SLI gaming, only to discover that despite HP saying my workstation (xw8400)DOES support SLI, supposedly the Intel 5000 chipset does not.  I need some straight answers. I know the the second PCI slot is only 4x, but surely there has to be a way around this by now. HP swears up and down that it works, but I cannot engage SLI, only set the second card as a dedicated Phys-X processor. While this certainly helps in most games, it isn't exactly what I was shooting for.  I tried 3rd party apps like HyperSLI, but without success. Everytime I boot with HyperSLI and try to engage SLI functionality, it blue screens and reboots.
 
Am I wasting my time trying? or have Intel and Nvidia finally kissed and made up, and there's a patch or something somewhere that will resolve this, that I am simply not aware of??  I know the XW8400 is an older machine, but it's all I have right now, and it's pretty well maxed out. 2- 2.66 Quad core Xeon's, 32Gb Ram, etc.  I find it asinine that there is no way to engage SLI on this board.... HELP!