Most of the benchmarks on notebookcheck with the HD 4000 are also on older drivers. Iris Pro is much faster (70%) because it does not have the bandwidth problem although it is otherwise the same GPU which cannot clock any higher. Generally the HD 5100 is a big GPU with lots of theoretical potential from which not much is left in real situations as the TDP the memory bandwitdh and the CPU side limit it too much. They range from about even to 30% difference sometimes twice as fast. You can compare real difference here by checking the HD 4000 and the HD 5100 respectively. ![]() People actually exagerate the difference between those GPUs. The GPU won't make too much of a difference for you.
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