ive got two 2500+'s so ill listem from oldest to newest.
first production run 2500+ (about 7 months old now) 2.3ghz 1.975v on an alpha pal8045 with a sunnon 50cfm fan stayed at around 110f idle and about 125-130f load......ive since switched to water so that chip was sitting at 90f idle 100f load on a maze3 1/2in fitted
and yes its still running at 1.975v
and my newest barton is a week30 2500+ @ 2.3ghz 1.9v sits at a nice 86f idle 95-100f load depending on my room temp and the damn humidity here. this is on a D-tek TC-4 rev2 which has taken the place of my maze3