THE NH-D15S & NH-U9S CHROMAX.BLACK

Aside both models being black in color the 125x95x95mm NH-U9S next to the 160x150x135mm NH-D15S reminds me of David and Goliath.

The Noctua logo is engraved on the fins of both coolers (and yes tiny details like this do matter).

Now even though the fan of the NH-U9S chromax.black is located at the front its small size does give it the zero-clearance issue with RAM modules and motherboard components (to that end the NH-D15S chromax.black comes with a single fan placed between its two heatsinks).

The heatsink of the NH-U9S chromax.black consists by a grand total of 43 fins whereas each of the 2 heatsinks of the NH-D15S chromax.black by 44 fins (88 total).

When it comes to number of copper heatpipes the NH-D15S chromax.black features six 6mm ones while the NH-U9S chromax.black comes with five 6mm ones.

Here we have the NF-A9 PWM fan (2000RPM/46.43CFM/22.8dBA) of the NH-U9S chromax.black right next to the NF-A15 150mm HS-PWM fan (1500RPM/82.51CFM/24.6dBA) of the NH-D15S chromax.black.

Both fans feature rubber vibration absorbing pads on all 4 corners.

The nickel plated copper bases of both coolers are polished (not quite mirror like however).