Dual quad Temps

is normal see 1 of quad processors rise higher in temperature other?

under stress, 1 processor 50 deg c (heatsink = 44c) while other 43 deg c (heatsink = 37).

i'm running mac pro 4,1.

 

similar thing here:
1 cpu, heatsink 40c, processor average 48c, other cpu heatsink 30c, processor average 37c.

mp 4.1 dual 2.26ghz.

removed heatsinks cleaned thermal paste , applied new layer of arctic mx-4 compound, same results, guess it's normal

 

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