Geez....39-40 is ice cold for a CPU, typically you will see 45-50 in moderate use. Officially, most AMD processors Ive worked with have a thermal tollerance of 90° C, so 50's is N O T H I N G.
My latesy beast I made for peace and quiet,
Antec Sonata case with quiet 480 PS
512 DDR 2700
AMD 2500+ barton @333
Zalman CNPS6000 ultraquiet CPU cooler
MSI K7N2G-ILSR mobo (removed fan from IGP allow cooling thru main fan)
Radeon 9800 Pro
120gig Maxtor HD
SOny 52X CDR
(DVD burning soon!)
This thing is QUIET....10x better than my old system.
Average CP temp is 46 idle....52 during intense gaming....and this is in silent mode