Aandtech recently used the Dolphin benchmarking tool to show how different CPUs stack up when using Dolphin. Dolphin needs stronger single core speeds, so the faster each core is, the better it performs.
https://forums.dolphin-emu.org/Thread-anandtech-s-results-for-dolphin-cpu-benchmark
Basically, the i7-4770K is the best for Dolphin, and the i5-4670K is the same thing as the i7 just without hyperthreading.
cpubenchmark.com lumps all of the combined scores for a CPU together. You'll get a better picture of how Dolphin will behave by looking at the above link (or if someone could link the actual benchmark list, I'm too lazy to find it), OR looking at single core speed comparisons from http://cpuboss.com/ (look at the single-core speed comparisons)
https://forums.dolphin-emu.org/Thread-anandtech-s-results-for-dolphin-cpu-benchmark
Basically, the i7-4770K is the best for Dolphin, and the i5-4670K is the same thing as the i7 just without hyperthreading.
cpubenchmark.com lumps all of the combined scores for a CPU together. You'll get a better picture of how Dolphin will behave by looking at the above link (or if someone could link the actual benchmark list, I'm too lazy to find it), OR looking at single core speed comparisons from http://cpuboss.com/ (look at the single-core speed comparisons)