Is my CPU too hot?

G

Guest

Guest
Processor: Q6600
Revision: G0
Stepping: B
Stock Speeds: 2.4Ghz

Heatsink: Scythe Mugen Rev.2
Thermal Paste: Arctic MX-3
Motherboard: GB P35-DS3R
Case: Antec Sonata Plus 550
Ambient Temp: 25-27 Celcuis

Airflow: Intake from front, exhaust from back, 2 Antec 90mm 1200 rpm fans in front and 1 Antec 120mm (stock) in the back
CPU fan on auto

Speed Fan results
Idle: 26-29C
Load: 47-62C

Coretemps results
Idle: 35-39C
Load: 57-72C

Load: Prime95 - ran about 10 mins

I recently change the heatsink. I'm not sure if I added enough thermal paste since I only put a grain size amount.
Core temps of #3 and 4 are usually a few degrees higher than core 1 and 2 (under load, there's quite a big difference, around 15C)
Should I reapply the thermal paste? or these temps are normal? should i try installing the heatsink again, ensure its mounted properly?

Please and thank you =D