pc probe is only good for a few things.
1. CPU Core Voltage.
2. RPM on your CPU fan header.
3. Possibly NB temp.
4. Any RPM on fans you have connected to headers.
5. if your into monitoring voltages..
Realtemp is only good for getting the DTS off the Core so you get coretemp.
Same with coretemp.
Speedfan was nice, however PC Probe is nicer because it lets you put each catigories in nice little boxes and you can move them to a side of your screen.