sn41g2--idle temps? oc'ng

hello to all:
I have just done a small upgrade and was hoping to over clock this
puppy just a little. I was running this with 2400 and 333ddr ram.
I got a 2500 ,some 4000ddr ram, AIW 9600 and a new silent X PS. with out
OC'ing my idle temperature is a about 44C for the cpu . Does that sound
right or high? ( it was 48 till I tighten the screws a little ) I think
my 2400 was about that .I am using artic silver.
Second if I use Speedfan to adjust the Clock speed the machine will
reboot. Anyone know how to adjust the Clock speed on the fly. I would
rather not reboot.my ideal thought would be bouncing between 100
and 200 fsb to keep it cooler when I don't need the power
third it will boot to 3200 but is not stable. am I asking too much from
my little box? ( of course that was before tightening the screws,
haven't tried it since ) What should be the idle ( if anyone has done it
....) at 3200? I hit the mid 50's and it rebooted

thanks in advance