Good Temp Utilities

I have 2 that seem to be working OK (cannot remember what their names are now) but both give me about the same reading... but when say run 3DMark03 several times to raise up the temps, then quickly reboot and check the temps in the bios, it is always about 5C lower than the reading there... on one of my utilities, I was able to lower my reading accordingly...

But I have also read that there are two readings to worry about... what reading does the bios give... the board in question is an ECS L7S7A2

<font color=red><b>To reign is worth ambition though in Hell:
Better to reign in Hell, than serve in Heav'n.</b></font color=red>
John Milton, <i>Paradise Lost</i>, II 262-263

That is one of my two... and it reads 5c higher than the temp in my bios... I downloaded one a while back as recommended from an ESC specific forum, and it read the same, but I was able to adjust the temp o match my bios...

Are the readings measuring different places?

<font color=red><b>To reign is worth ambition though in Hell:
Better to reign in Hell, than serve in Heav'n.</b></font color=red>
John Milton, <i>Paradise Lost</i>, II 262-263