You certainly were in situation to read somewhere or to see for yourselves that with same settings and hardware, someone has lower temperatures then you, and better overclock respectively. Reasons should be looked for in bad connection between PTD and cooler. Bad connection is the consequence of using bad paste or its irregular depositing. However, sometimes happens that processor or cooler are „guilty“. Each and every one of you who at least once looked for maximal stable overclock of processor certainly encountered a bunch of difficulties at least regarding temperature. It is generally known that each processor which wants to award your effort with high rate requires certain voltage. Problem comes up when processor is ready to “cooperate” on some voltage which is not recommendable for daily usage. With increasing of voltage thermal dissipation is increasing too, and temperature increasing is the biggest overclockers`s enemy. When you use all conventional resources for draining the heat from processor, "extreme" measures are to be taken. One of them is cooler polishing as well processor’s thermal dissipaters (copper „cover“ which covers only the core).