Noctua NH-D15 G2 HBC Next Gen Dual Tower CPU Cooler\n\nWith its state-of-the-art; speed-offset NF-A14x25r G2 PWM fans; eight heatpipes and asymmetrical fin-stacks that have been carefully fine-tuned to work in tandem with the new fans; it achieves even better quiet cooling performance than its award-winning predecessor. As such; the G2 version is a true flagship model that continues the legacy of the original NH-D15 by pushing the boundaries of air cooling and rivalling the efficiency of many all-in-one (AIO) water cooling solutions. In addition to its further improved performance; the NH-D15 G2 also offers enhanced compatibility thanks to an offset construction that allows it to clear the top PCIe x16 slot on most current motherboards. Last but not least; the G2 version has been upgraded to the Torx-based SecuFirm2+ multi-socket mounting system with included NM-SD1 screwdriver as well as to Noctua's superior NT-H2 thermal compound. In short; the NH-D15 G2 has been further refined in;