e2160 OC'd - 2.4Ghz Speedfan & Core Temp agree?

Sys Specs:

e2160 @ 2.4Ghz @ 1.225v
EVGA 630i/GeForce 7100 Mobo
2GB Corsair XMS2 PC6400

Below are temps from my BIOS, Speedfan, and Core Temp

BIOS:

CPU: 44°


Speedfan 4.33:

CPU: 38°
Core1: 25°
Core2: 25°


Core Temp .96:

Core1: 25°
Core2: 25°

Both Speedfan and Core Temp agree with each other on the core temps but Speedfan's CPU temp is 13° higher. Also, in my BIOS, it says my CPU temp is 44°

Which temps are the accurate ones?

Thanks!