That's installed on a stock 2600k on an Intel DP67DE motherboard per the manufacturer's instructions. The plastic push-pins combined with the shitty paste on these things is atrocious. They've actually gotten worse with the 2600k, IMO. My i7-950 is a bigger heatsink and had much better paste on it (obviously, as it ran about 15C cooler than these did and the 950 was OC'd from 3.06 to ~3.8GHZ!! /boggle).
Get some good Arctic Silver or Noctua NH-T1 and clean that stock junk off of there. I suspect the stock heatsink would probably do OK with good paste for normal, non-OC situations, though considering big heat-pipe heatsinks can be had for less than $30, there's not much reason to stick with the stock coolers anymore, especially considering the abysmal performance.
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