Then multicore CPUs came around and made things more complicated. In the old days this was pretty simple, you had a single core and a single thermal design point (TDP) that you had to hit. Those limits are shared with manufacturers who then spec power supplies, cooling systems and cases that can handle those CPUs. All CPUs are designed to certain power and thermal limits. First a quick refresher about what Turbo Boost does on Intel CPUs. Letting my guard down wasn't something I was interested in doing so I went about verifying Turbo on the new Air. Since then I've been quite concerned about Apple playing clock speed games with its systems, but thankfully since then we haven't seen any similar issues. Instead the chip typically ran at or below 1.4GHz, allowing the second generation 11-inch MacBook Air to outperform it. The original MacBook Air had a 1.86GHz Core 2 Duo that pretty much never ran at 1.86GHz.
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