Throttling is not severe but it does show or at least I can see it. When playing GTAIV or doing benchmarks it gets laggy after a long period but still I should say it doesn't feel like a 20%, I get the feeling it just turns Turbo Boost off to cool down a bit. Temperatures hoover around 90° on this machine when on full load. Which makes me wonder how come there is people pushing their GPU's on full load and Overclocking inclusive and reporting temperatures lower to 80°??