We used iTunes to convert an uncompressed .wav file into a high-quality (160 Kbps) MP3 file, and checked how many seconds each CPU took to perform this operation. Therefore, the results below are given in seconds, so the lower the number the better.
Here the two CPUs from Intel were faster than their competitors from AMD. The Core i3-3220 was 17% faster than the A10-5800K, while the Core i3-2105 was 9% faster than this CPU. The A10-5800K was 4% faster than the A8-3870K.