Audio
Lame and OGG love the higher CPU clock speed, but ignore the extra two processing cores.
Video
As with the midrange build, DivX gives a disproportionate gain to the four-core processor of the current system, while XviD gets its boost from clock speed only.
Applications
3D Studio Max gets twice the performance by doubling the number of cores, at least when a slight clock speed boost is also part of the equation.