Yup sounds like he/she is talking CPU coolers. If you want to use a Cooler Master branded cooler the V8 is very good. It should allow overclocking to 4 Ghz plus. This cooler is very large so check case fitment first. The V6/V6 GT are also good but 4 ghz is the limit IMO. I'm using a V6 GT on my i7 930 and it does very well. This cooler should fit in most ATX mid tower cases no problem. If brand is open there are many coolers that work well on the i7's. Just Google for some reviews. Do keep in mind socket 1366 i7's run hot even with high end water cooling. Your doing fine as long as CPU temp under heavy load (IntelBurnTest, OCCT or Prime95) is under 80C. My i7 930/V6 GT runs 70-72C @ 3.8 Ghz running IntelBurnTest on high with 8 threads. At 4 Ghz temps top out at 80-82C. These results were obtained at approx 22C ambient temp.
Bill