The game runs perfectly at nearly fullspeed (24FPS in ICC optimized PAL-Version) in 1080p 16XAF 3x internal res. without bigger problems (but rare dolphin crashes and very rare soundloops) on a Dell XPS 17 GT555M and while running Zelda SS CPU utilization is always below 80%. You should use HLE audio, Dualcore and OpenMP and Lectrodes build http://electrodexs.net/dolphin/manual/default.htm. The latter increases FPS by 20% on my system.
When using HLE audio there is no need to overclock a Sandy Bridge CPU, since performance is limited by GPU in most cases. Of course there is a lot of room for speed and image quality optimizations in Dolhin. By the way it is completely useless to have a higher internal resolution than your display can handle. On a 1080p TV, you should set internal resolution to 3x since 4x does not provide any benefits.
When using HLE audio there is no need to overclock a Sandy Bridge CPU, since performance is limited by GPU in most cases. Of course there is a lot of room for speed and image quality optimizations in Dolhin. By the way it is completely useless to have a higher internal resolution than your display can handle. On a 1080p TV, you should set internal resolution to 3x since 4x does not provide any benefits.