Poor Performance in Certain Areas (Where's the bottleneck?)

[tential]

My rig is a 4770k, HD7950 with 8GB of ram.

So I saw a TON of videos and figured that I should be able to play 90%+ of games with 4x IR and AA? Even 2x AA?

However, running the lattest dev build
Dolphin 4.0-3966 (ok small changes since then but I don't think that would effect performance)

I get low FPS in some areas where I seemingly can't figure out the bottleneck. Nothing is pegged at 100% so I don't know what to turnup/down.

All of my settings at the "defaults" i believe butg I can post them if necessary.

Resolution is set to 1080p (not auto) and FPS is set to auto. Not sure if this effects anything.




There were a couple of other instances. I started to do a mild OC on my Videocard to see if it would alleviate the problem somewhat and the most I gained was 1% on a lighting heavy level of SMG.

Edit: 4x IR and 4x AA. Moving AA up/down seems to help but what I'm trying to understand is why I wouldn't be using 100% of my GPU? Should I go for a higher OC? I probably have the room.
Also, should I assigned Dolphin to cores when I'm playing? My i7 has Hyperthreading turned on so maybe that woul dhelp?