If you opt for a six core processor you get great encoding performance, but worse gaming and web browsing performance. Browsing the web may only task one or two cores, gaming might use two or four and encoding a video can use all six.

Instead you’ve got a mix of applications and workloads that’ll use anywhere from one to six cores. This is fine if all of your applications are multithreaded and can use all available cores, but life is rarely so perfect. Six cores? Now you’re probably down to 3.2GHz. Want a quad-core version? Drop the clock speed again. If a single hypothetical 4GHz processor core hits 125W, then fitting two of them into the same TDP you have to run the cores at a lower clock speed. In homogenous multicore CPUs you’ve got a number of identical processor cores that together have to share the maximum TDP of the processor. These TDP limits become a problem as you scale up clock speed or core count. High end desktop CPUs now spend their days bumping up against 125 - 140W limits. It wasn’t until we started hitting physical limits of power consumption and heat dissipation that Intel (and AMD) imposed some limits. Prior to the Pentium 4, desktop PCs saw generally rising TDPs for both CPUs and GPUs with little regard to maximum power consumption. In the Pentium 4 days Intel quickly discovered that there was a ceiling in terms of how much heat you could realistically dissipate in a standard desktop PC without resorting to more exotic cooling methods.

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