That sounds a lot like your system is running rather unstable. Try the same settings in after effects without overclocking your cpu, that might solve the problem.
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That does indeed sound like your computer has a problem far beyond After Effects; it's just that After Effects is working you computer hard enough to expose the problem. You may have bad RAM, inadequate cooling, or an inadequate power supply (just to mention a few possibilities).
edit: Double check the memory you are using is compatible with the motherboard: If it is: try just loading the XMP profile in the bios for your gskill ram. Re-run the ram preview..
Also you didn't mention the cooling solution you are using for your CPU, it might be not be up to the task..
I assuming you have run something like intel's CPU stress test to verify the stablity of your overclock of CPU?