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The Noctua NH-D9L performed very well considering its size being the smallest heatsink in the set. Performance level is very similar to the extremely popular and larger CM Hyper 212+ and dual NH-U9B SE2 in the standardized overclocked test. It placed last in the stock benchmarks but handled overclocks better than the dual-fan NH-U9B SE2 once additional voltage is introduced and the CPU was overclocked. Adding a second NF-A9 fan to the NH-D9L pushed performance closer to the NH-U9S. In terms of noise level, the NF-A9 fan on the NH-D9L is also the quietest and even with the added fan, it is still quieter than the previous generation NH-U9B SE2 which is running at a lower RPM.
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