Running both together would push the power consumption well over 100 watts if the control circuit didn't intervene and reduce the clock frequencies of both GPU and cores. ![]() Running a heavily threaded CPU benchmark can make the processor exceed it's rated 65 watts by a considerable margin, as can running an intensive GPU benchmark. Getting the power balance correct is quite a complex process for the internal control circuits. The situation of an APU, such as the OP's Ryzen 5 2400G is even more complicated because, not only does it contain four Zen cores, but a powerful integrated Vega GPU. Different manufacturers use different methods of calculating TDP and modern CPUs when under load can dissipate considerably more than the rated TDP. It's used more as a guide for choosing an appropriate cooling solution - processor A is in this class, so needs this amount of cooling. Actually, TDP means Thermal Design Power, which these days has little to do with the amount of electrical energy used or the heat dissipated (which, of course, are necessarily identical) by the processor.
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