Is it normal for Idle CPU Temp to be high at first?

Question

Is there some type of break-in period when you first put on the arctic alumina and the heatsink?
I am running a A64 3500+ non 90nm  with a Swiftech MCX-64V HS and using the arctic alumina. I followed their instructions to a T. I spread it all over the HS then wiped it off then I placed a small blob in the center of the CPU cover and set the HS down on it.
I just finally got BIOS to boot up and it has been running for about 30minutes. The CPU IDLE temp goes between 41C and 45C and it seems to be fluctuating quite a bit. Will it cool down over time or is it something I should check out now?
I recall my last MOBO, an EPOX 8RDA+ with a Swiftech MCX462+ usually would hover around 36C idle.
Also I saw mentioned on a website something about changing the fan voltage to 12V instead of 7V. How can you tell what your CPU fan's voltage is and if it is 7V can you change it to 12V to increase airflow?
Thanks

Answer 1

1) There usually is a period of a couple of days Quote
break-in period
2) Tha Temp reading is from the winbond sensor & records temp as a function of proccessor activity. This causes rapid temp changes to be seen as CPU activity changes. It's a bit like telling you the water flow through a tap. Removal of heat depends on quality of CPU Cooler & Case cooling.(Like the capacity of plug hole in sink).
3) If your 3500 is a winchester 90Mu then check in bios that your vcore is 1.4v not 1.5v, which is the default volts for the older 130 fabrication. Higher voltage gives higher temp.
4) Quote
12V instead of 7V
- Pass
Hope this helps