I just built two identical E8400 + Gigabyte DS3R systems. Everything is the same, with the heatsink being the only difference -- one has a Thermalright Ultra 120 Extreme and the other has an Ultima 90.

(1) The Ultima 90 system has a CPU Vcore of 1.18v. Both cores are reported at 23-25C (idle). It runs 3.6GHz with stock 1.18v @ 28-30C (idle). All power saving features are disabled.

(1) The Ultra 120 Extreme system has a CPU Vcore of 1.12v. Core #0 is 38c while idle and core #1 is 25C. It runs 3.6Ghz with 1.20v; core #0 stays at 38c and core #1 increases to 35C (idle). All power savings features are disabled.

Is such variation normal between two chips from the same bin? Or did I not install my Ultra 120 Extreme correctly?