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Keep in mind that SpeedStep doesn't really care about heat or power so much unless those things become critical. What it will do quite routinely on Dual/Quad core cpus is just up and decide not to up the mhz of your core because <75% of the total power of both cores is in use. SpeedStep figures if it's not used then no need to up the cpu clock for it. Translation: SpeedStep works in low-speed mode by default and only gives you full blast power when apps 'demand' it. Unfortunately most apps are single-threaded, or multithreaded in a way that doesn't trigger SpeedStep's booster. This happens a lot in Pcsx2 currently, because of the synchronization required between GS and EE emulation (the two threads of the emulator).
Jake Stine (Air) - Programmer - PCSX2 Dev Team