There are only a few factors for any Processor.
Heat
Speed
Cache Memory
FSB
The most important factor is the actual Results on benchmarks and heat. If you get good results and lower heat, then the processor should last longer. Just be careful about motherboard benchmarks. I think they just handpick the best motherboards and you cant tell the overall quality of the average motherboard. I never buy the newest processors because I dont have a lot of cash to waste. If you take the last 3 processors released, the top end is like 1,000 to 600 and there may be a $400 difference in a slightly slower processor. Two Processors of the same model and speed are pretty much identical becaus of the quality requirements for processors. So benchmarks for processors are a good guideline for performance. There is often very little difference in performance.