I think you will find it hard if not imposable to get a Q6600 @ 4GHz & 4GB of RAM Prime blend stable, will your CPU run small fft @ 4GHz or are you just trying to get it working/PI/game stable ?
Voltages aside (I think maybe a tad more NB & vcore)
I would try TWR/13-14 TWTR/12 TRTP/3-4 & manually set All PRE to refresh to 4-5 then run Prime95 v25.5 selecting/custom/4096-4096fft for an hour if that holds you should be fine with the RAM.
If you don't already use it get Memset v3.4 beta 3 so you can view/change the above settings from windows whilst testing for stability.
CN

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