$1,099 iMac review: lose 50% of your performance to save 18% of the money | Arstechnica

The $1,099 iMac does manage to pull ahead during GPU-heavy activities, but only by a small amount. Past experience has demonstrated that Intel's integrated GPUs are much more power-hungry (and thus, heat-generating, and quicker to throttle) than its CPU cores. Look at the power consumption numbers from Intel's NUC mini desktop, which uses essentially the same CPU—gaming is more stressful than pushing all the CPU cores to the max. Since the new iMac can dissipate more heat, it has a small edge.

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