2000 n 3000 more or less is improving the power usage and heat reduction on the GPU & CPU... so the fan sizes does the job for each model..

ppl can tell how long their ps3 last.. but its actually differs from 1 to another, eg. as 1 would hv it on 7 hrs a day mostly using as media player only.. while some full blast gaming 10 hours perday would not have the same effect of wear and tear..

how long will a ps3 last id say its actually about 1.5 years coz that is usually the warranty offerred...

after that most probably some parts would start to fail even if there is no YLOD like Lens, Hdd, Power supply..