The 2500K has a reputation for being a beast OCer with claims of up to 5Ghz reached. My question is: what's the practical difference in terms of OC performance for this chip when it's cooled by the most popular aftermarket coolers on the market that cost $30 (the Arctic Cooling Freezer 7 Pro and the Cooler Master Hyper 212 Plus) versus the more expensive ones (for example, the $70 Zalman CNPS9900MAX-B)? Airflow and fan size seem to be variable between coolers of different cost. Typically it seems the more expensive ones use better metals and/or have larger fan sizes that will probably last longer, but I was curious if this made a difference concrete enough to justify the difference in price. Within the context of an overall performance-class gaming build, $40 isn't a great deal, but it can be construed as significant if you consider it's money not being devoted to a better case/PSU/GPU.