Intel CPU's actually overclock better than AMD's on average, especially considering AMD pretty much doesn't do laptops/UMPC's any more so their tech is lagging behind. Maybe with 32nm parts that will change, but for the moment Intel is winning in the performance/power sense. The 1.6ghz Atom I've seen overclocked to as much as 2.4ghs, although most people don't go over 2.1ghz. The GMA950 can obviously be overclocked with GMAbooster although it doesn't really make a difference from what I've seen. But the CPU overclocking can improve performance a lot, as well as Gamebooster and tweaking the OS. Process Lasso might help, although I uninstalled it to make the system more stable.
-- INTEL 9xx SOLDIERS SANS FRONTIERS
