Being a cautious n00b to the world of overclocking I have a quesition. In my system I have the following components (that are relevant to this matter):

Intel Core 2 Duo E6600 (currently with the FSB set to 333mhz to get a 3ghz stable speed)
Asus P5W DH Deluxe (with the BIOS at 1305)
2GB (2x1GB) PC6400 (DDR2-800) 4-4-4-12 Corsair XMS2 C4 memory (currently running at DDR2-833 speeds with timings at 5-5-5-12)
Arctic Cooling Freezer 7 Pro CPU Cooler
Tagan TG480-U01 PSU

I also have a couple of akasa 80mm fans directly behind the CPU cooler running at 1800ish rpm sucking air out of the case and one on the side window of the case above the graphics card area. I would say the internals are kept reasonable cool at the moment (the cpu is currently 28c at 3ghz idle).

Given this sort of setup how high can I realistically go without shortening the product life of the components (if possible)? Ideally I would like to set my memory to 4-4-4-12 but I have not yet been able to do so without the power cutting out.

Again I realise I am a total n00b here but I have to ask this - can the product lives of products like the CPU be shortened quite drastically by this sort of overclocking? I tend to keep my components for between two and three years at a time so I'd like them to last that long at least (and much longer ideally).