What about Intel Core i7-4770K @ 3.50GHz? It seems to be better than i5 4670. http://www.cpubenchmark.net/high_end_cpus.html
Operating System: Windows 8.1 Pro 64 bit
Processor/CPU: Intel® Core i7-4790K CPU @ 4.00GHz (8 CPUs), ~4.0GHz
Motherboard: Gigabyte GA-Z87X-UD4H ATX
Video Card/GPU: NVIDIA GeForce GTX 980 Ti
Memory/RAM: 16 gb
Power supply: Coolmaster GX II 750 W
Dolphin Revision Currently Using: Dolphin 5.0-rc-34
Processor/CPU: Intel® Core i7-4790K CPU @ 4.00GHz (8 CPUs), ~4.0GHz
Motherboard: Gigabyte GA-Z87X-UD4H ATX
Video Card/GPU: NVIDIA GeForce GTX 980 Ti
Memory/RAM: 16 gb
Power supply: Coolmaster GX II 750 W
Dolphin Revision Currently Using: Dolphin 5.0-rc-34