Not sure if you'll be able to reach 5Ghz, depending on your choice of cpu. But if its a choice between the two, get the d-15. Is it worth the money? That's subjective and relative to you really. If it must be an air cooler, the d-15 has proven itself one of the best on the market. However, there are others that rival it in quality and performance. Cryorig R1 Ultimate, Phanteks PH-TC14PE, Thermalright's Silver Arrow and Macho lines, so on and so forth. All listed above, and others I've neglected to name, are flagship air coolers, though the D-15 tops them last I knew, with the possible exception of the R1 Ultimate? Anyhow, yes, the d-15 is an excellent, well built cooler. The 212 evo shouldn't even be mentioned in the same...