Looking around, I stumbled across an article that might interest those who plan to purchase a Nehalem Mac Pro.
There will be some sort of certification process, and fees will be involved.
I've no idea if Apple would submit to this, but it may be possible.
Article link.NVISION If you want to combine a pair of GeForce graphics cards with a new Core i7 processor from Intel later this year, you're in luck. Just after the grand finale for its Nvision conference, Nvidia gathered reporters to inform them of a somewhat surprising and apparently very recent decision: the firm plans to enable its SLI multi-GPU scheme to work with Intel's X58 chipsetwithout the need for an nForce 200 PCI Express bridge chip on the motherboard.
There will be some sort of certification process, and fees will be involved.
I've no idea if Apple would submit to this, but it may be possible.