[X4U] Acceptable CPU temperature

[Jay E. Krauss, Jr.]

I have a MDD dual 1.25 GHz with 2 Gb RAM (1 Gb 
original Apple, other 1 Gb from Other World 
Computing) running OS X 10.3.6. The computer 
periodically "locks up" and requires a complete 
restart. TechTool Pro 4 does not detect bad RAM; 
Disk Utility, DiskWarrior 3.0.2 and Norton Disk 
Doctor 8.0.2 indicate no problems with the hard 
disks (IBM 120 Gb and two Maxtor 250 Gb in a 
mirrored RAID).
Temperature Monitor 2.21 indicates a CPU 
temperature of 56.4-56.8°C. Is this hot enough to 
cause failure? The fan runs continually. I 
haven't found any information on Power PC 
processor temperatures. Apparently Intel and AMD 
processors develop problems around 60°C.
Any thoughts would be appreciated.