well to be honest mate, will it be under 100% load 24/7? because the intel burn test/prime 95 are to check stability/temps with everything turned up to max, during normal use i guess it wont be maxed out all time, you only really start affecting cpu lifespan if your temps are getting so high that the cpu is throttling itself, otherwise it shouldnt really impact life span, have you tried turning up cpu/case fans a bit? or are they maxed out now?