Core 2 Quad 2.4ghz Overclocked to 3.6ghz

You'll just need to keep adding to the VCore to get it more stable at higher clocks, even with water cooling be weary of temperatures.

add a little to the NB also - 1.52v seems a bit high also - so you may be near the limit - mine does it at ~1.45v (my q6600)
I could get mine to 3.8ghz prime stable under my TRUE.

although - to get to 3.8ghz - i was using ~1.55v - 0.1v more than 3.6ghz - and the extra heat made it useless - 3.6ghz is the q6600s sweetspot (along with 3.2ghz if undervolting)

EDIT: - also - try overclocking on the 8 multiplyer - system will be slightly faster @ 450*8 - as you will get more memory bandwidth (make sure your ram an run at >=900mhz though)
But as i said - definatly add some to the NB - having 8gb of ram will load up the NB even more.

I would run my multiplier at 8, however my ram will not OC. It's pretty cheap stuff. Thanks and I'll try what you guys have mentioned.