I know this might sound like a stupid thing to post, but many ppl overlook it. After a few months of use, you hsf will get clogged with dust and the fan wont be able to push air through it nearly as well. To prove this, i recently cleaned off my thermalright slk800 and i restarted and my temps dropped 5C. The cleaning took all of 3 minutes with a damp rag. With other coolers the difference might not be as dramatic due to the design of the slk,s but for everyone who is running one, make sure to keep it clean if you are overclocking and like to keep your low temps.
System: XP2600 oced to 2.4GHZ, 512mb corsair pc2700 oced to 192mhz x2, 36Gb 10k rpm WD SATA, 80GB Western Digital A7N8X Deluxe, Radeon 9800 pro
System: XP2600 oced to 2.4GHZ, 512mb corsair pc2700 oced to 192mhz x2, 36Gb 10k rpm WD SATA, 80GB Western Digital A7N8X Deluxe, Radeon 9800 pro