I've had my E5200 in my system for about 2 months now... more than enough time for the AS5 to set. I am using a Xigmatek HDT-S963 HSF that may not be on properly... I've done it about 5 times and I can usually get it to idle at around 28*C ... not much better than stock.
Anyway, I OC'd the CPU and it was steady 31/32 for the longest time. Now it is idling at 35/36/37 and nothing has changed. In fact, the ambient temperature has gotten colder with winter. I have never seen this before... any possible causes?
Let me start by saying I haven't fiddled at all with desktop CPU fans and the like. Anyway, here's my thought. If you have any other fan inside the case that is temperature controlled then maybe that fan is running less often because whatever part it cools is colder now because its winter. This is a wild shot in the dark but I hope it's worth something.
Oh I don't have the heat on very high... I like to save my dollars and wear a few extra sweaters.
I am not sure the top fan is the problem. I've had it in this setup for months now and the temperatures were gradually lowering as the AS5 set. Then, suddenly, HIGHER! Not near a heat source of any kind, not even a vent.