> I'm guessing that the mobile version does have less execution units.
They don't. The architecture of their mobile CPUs is exactly the same as the desktop versions. (They use the same die.) The difference is in the thermal limits, which determine how long the CPU can spend at each power state.
Another huge difference can be whether the machine has a memory configuration that runs in dual-channel mode or not, as well as differences in cache sizes and BIOS settings for things like cache pre-fetching.
They don't. The architecture of their mobile CPUs is exactly the same as the desktop versions. (They use the same die.) The difference is in the thermal limits, which determine how long the CPU can spend at each power state.