Just installed my i7-2600k last night, im using a prolimatech supermega with 2 120mm scythe slipstreams 1900rpm, i haven't overclocked yet and already i have a 12 degree difference between cores, i would understand if it was ~5 degrees but 12 is alot, the other cores sit around 23 degrees and one core is at 35. Best bet would be reseating the heatsink? could be a dodgy thermal paste job i suppose but i thought i did it well