query on my temps

hey guys i got MBM running and just wondering which sensor is reading what, im using a A7N8X deluxe with a 2500+, sensor 1 is asus1, sensor 2 is asus2, and sensor 3 is reading off a serial numbe thongy (there were 2 serial number thingies, one has diode next to name but doesnt work so i used the one withoug diode)
the respective temps idle are 21 36 45 , under load (prime95 for example) its 27 45 49... so which one is cpu temp? should i worry bout these temps?

Nothing to worry about there, it seems likely that the third temp is your CPU. Anything under 50C is pretty good, though you probably could do better. What HSF do you have?

ive got a slk800 with a panaflo fan (80mm) on top oif it, ive also got 2 intake fans and 2 out fans on the case

should i change the fan on the HS?