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Spikes in speed at 60FPS

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Hello! I'm new to these forums, too bad my first post will be in the support section but I've seen some very interesting stuff on these forums so far.

Anyway, I've been running Dolphin 4.0.2 for a bit now but I can't get my speed to stay at a 100% or 90%> or something good enough.

My specs are as follows:
CPU: AMD Phenom II 1090T (Stock speeds, my PSU is so old now it will no longer run my OC stable)
GPU: AMD Sapphire HD 7950 Boost
RAM: Corsair Vengeance 8GB

I know emulators are mainly CPU based, my GPU is enough to be doing any graphical tasks, I'm sure.
My CPU is quite aged by now but it's still pretty decent.

The problem I'm having is not being able to maintain a high emulation speed, I have no problem continuously running 60 FPS but it's just the speed that seems to be dropping randomly.

I'm mainly playing Super Smash Bros. Brawl, I might get some other games in the future but that's not what I'm aiming for right now. I want to play Project M (Brawl mod) but I haven't bothered with that yet because I'm trying to get my in-game experience as smooth as possible.

So previously I had 4.0.2 installed, tried 4.0, 3.5 and 3.0 to see if they were somehow more stable with SSBB, my game seemed to have terrible playback after that so I completely reinstalled my emulator and removed the config files, it works a bit better now but it's still nowhere near as good as it could be.

So, my settings used are this:
http://imageshack.us/a/img856/158/h5rj.png

It doesn't seem to matter if I use native resolution or upscaled, AA and AF, they all stutter both visually and audibly, it seems to have spikes where this happens, it'll be completely smooth for a few seconds and then it'll stutter for a few seconds.

I'd be happy to run 1.5x native and 4x AA, that's all I really need.

So, do you recommend I change any settings? Should I use another version in case there's one that works better with Brawl than 4.0.2?
I have 2 unrelated questions to my performance as well:
- Is there a way to see if my Brawl dump is PAL or NTSC? I don't know the difference and I couldn't find it in Dolphin either.
- Is there a way to run 120 FPS without going over 100% speed, or is this locked? I have a 120Hz monitor so that's why I'm asking.

I thank you in advance!

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