Memory, reason for low fps?

[Guardix]

So I've been looking around and seen some rigs go with 40+ fps during raids.
My rig currently pulls, while standing in Orgrimmar, 20 fps (It's a rather populated server) and during a boss fight in ICC it sometimes drop to 10 fps.
- Not that lucky when you're working on LK HC on 25man :/.

These are my WoW settings:
1920x1200, 24bit color/24bit depth 1xMultisample

View distance: 40%
Terrain Blending: 100%
Particle density: 100%
Shadow quality: 0%
Environment detail: 70%
Ground clutter density: 80%
Ground clutter radius: 80%
Texture resolution: 100%
Texture Filtering: 100%
Weather intensity: 40%
Player textures: 100%

Specular lightning and Death effect enabled.
Maximized window mode.

processAffinityMask is set to 15.


My rig is as follows:
http://valid.canardpc.com/show_oc.php?id=1329291


I run a pair of dual channel Kingston KHX6400D2LLK2/2G with the timings 4-4-4-12 and a single stick Kingston KHX6400D2LL/1G with the same timings.
The single ram stick is rather new, I bought it to see if it made any difference.
It now runs dual channel asymmetric though.

I have been thinking of overclocking my CPU to get an FSBRAM ratio of 1:1, but I find my CPU temps to be a little too high, 70C degrees.
I hope adding some more cooling pasta and clean the cooler will help. it is after all around 3 years since I last put some on it.


I know my machine is getting old, but shouldn't it be able to perform better? Also I tried to set my my ram frequency to 800MHz, but once I loaded WoW I got a BSOD. Shouldn't the system be able to pull that? I mean the sticker on the RAM says 800MHz.