1) Overclocking memory is not required. All you need is ram that will run stable at whatever frequency and timings it's rated for.
2) Answered
3) NB frequency is tied to your L3 cache. The faster your cpu-nb the faster your L3 cache is running. Performance is the reason to overclock this.
4) Overclocking by itself does not decrease the lifetime of the cpu or motherboard. The heat generated if not dissipated properly is what degrades the components and leads to decreased lifetime. I have an opteron 165 running at 2.8ghz(1.8ghz stock) for 3 1/2 years never a single problem. I have a Athlon XP 2500+ that I ran at 2.3ghz for 6 years 24/7. I finally semi-retired that old bad boy. Take a rest good buddy you've served me well. lol
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