i have a p4 1.8a @2700
with crucial 2100 256 x 2 sticks
i upped the cpu voltage to 1.55 thats all i needed to get pc stable at 150fsb
memory is running at 150 without a hitch, ran prime 95 for 6 hours and no errors, and did 3dmark a bunch of times. and played some ut2k3, still stable
my memory is now my bottleneck yes but oh well, im happy with this system.
your idle temp is way higher than mine, right now mine is 31C and load is 46 max
i have my memory at 1:1 too, i tried 4:3 first and it worked fine so i just went to 1:1, i didn't up the voltage on the ram either
good luck