Why does phenom perform better than an intel quad at high resolution in Lost Planet?

[Jakko]

The game is purely GPU Limited with these settings like I told ya

At both JJ's settings, and your settings, the snow level is gpu limited.
I don't think your settings are "real life settings" though, anyone would turn up the eye candy, but not at the cost of having smooth gameplay.

It is weird how the phenom system performs better in some gpu limited scenarios.
This means that the same issue could arise on a quad crossfire system that uses settings closer to your high quality settings.