Q: At what level of CPU temperature should I be concerned?
A : That depends on your specific CPU, ie the XP 1900+ has a specified max die temp at +90C
If you are in the 50-60 you should be safe.
So you may set your shutdown temp to 70 ( but dont shoot me if it burn's )
Q: Why does it show my DDR SDRAM 333Mhz PC2700 with a frequency of 166Mhz instead of 333Mhz?
A : DDR = 2xspeed, 333/2=166,5 Mhz "base" speed.
Q: My PC2700 333Mhz DDR RAM should be running at 333Mhz but why does it not shown this in the settings given above? Are these settings correct for my PC2700 333Mhz DDR RAM?
A : You need to set your "base" speed for you RAM to 165 (*2=333) se above.