Well I was going to suggest removing what you had put in thats the first area always to look at, however if you don't believe its the problem thats fine.
Random freeze no BSOD, hmmm just for kicks run a smart check on both your HDDs see if it returns any problems.
If you're overclocking revert back to stock, its possible you're overclock has become unstable.
Run 2 passes of memtest to see if your memory returns any errors
Check the Event viewer in the Control panel>>Adminstrative tools check to see if any errors are occuring before hand in the system and application areas.
EE
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