This is a great upgrade for the stock radiator. I recently bought an Asus desktop with an Intel i5 6400 processor. The stock cooler ran at 30 degrees Celsius (86 F) and hit 67 C (152 F) under load. This was tested when converting videos with handbrake for 15 minutes. After replacing the stock cooler with the Nuctua NH-L9x65, I was now running at 27°C (80°F) and maxing out at 43°C (109°F) and converting the same video in the same amount of time. I also ran a CPU-Z stress test and got the same results. After 15 minutes, the peak temperature did not exceed 43°C (109°F). The fan is great too. The standard CPU fan was quite noisy, making a high-pitched squeak. This desktop PC sits on my desk next to my monitors. After replacing the hard drive with an SSD and installing a Noctua CPU cooler, it became almost silent. I didn't use low noise as it is inherently noiseless. Edit: I added a Noctua 92mm case fan this morning to see if it would cool this PC even more. There was no real difference. Run a 15-minute CPU-Z stress test and withstood a stable temperature of 43 °C (109 °F). I've added a screenshot of the test.
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