Short answer: yes
Long answer: High bandwidth, coupled with fast cores, OpenGl 4.4, and 2 GB memory will let you increase the IR/AA/AF to max or near max in most games. Dolphin relies more on the CPU than the GPU, so that really what you want to look for (opposite of "PC games" where you can have a sub-par CPU and fast GPU). Your i5 4670k is the best for Dolphin, so overclock it, and you should be able to run even the most demanding games at or near fullspeed.
Long answer: High bandwidth, coupled with fast cores, OpenGl 4.4, and 2 GB memory will let you increase the IR/AA/AF to max or near max in most games. Dolphin relies more on the CPU than the GPU, so that really what you want to look for (opposite of "PC games" where you can have a sub-par CPU and fast GPU). Your i5 4670k is the best for Dolphin, so overclock it, and you should be able to run even the most demanding games at or near fullspeed.