MSI afterburner scoring higher temperature than other programs?

I'm using MSI to monitor the in-game temperature, but it's setting a very high temperature, different from other programs.

 

Temperatures:

 

MSI: 53 - 55º idle (84º playing a heavy game)

CPUID HWMonitor: 43 - 44º idle (65º playing a heavy game)

Radeon settings (AMD software): 43 - 44º idle (65º playing a heavy game)

 

Video card:

AMD Radeon 6770 1gb gddr5

 

Which program should I trust?