Noctua NH-U14S DX-3647 (LGA3647) CPU Cooler Review

/ 2 years ago

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A Closer Look

Most of the parts of this cooler are well known already, but it’s still worth checking in on all the details. After all, this is a review and not a ‘remember what you saw some time ago’ post.

With the Fans Installed

The NH-U14S DX-3647 from Noctua looks as great as the other Noctua coolers. I used to be a bit split when it comes to the colours, but they’ve grown on me. Instead of seeing them as weird, they’ve become a synonym for effective cooling.

The NH-U14S is a little bigger than the other Noctua coolers and that has to be taken into consideration when you build your system. Make sure that there’s enough height for. The symmetrical build allows for two fans to be installed and they can be adjusted in height based on where you clip in the clips. This is something that can help with memory clearance if that should be an issue. But again, make sure your chassis has the height needed.

Noctua NH-U14S DX-3647 Photo view angle 2

Noctua includes one NF-A15 PWM fan with the package which has a rotational speed from 300 to 1500 RPM. With that, it can create a maximum airflow of 140.2 m³/h. The 140 x 150 x 25 mm fan comes with mounting hole spacing of 105 x 105 mm.

Noctua NH-U14S DX-3647 Photo fan

The cooler doesn’t look spectacular from the top, which is the most likely angle you’ll view it at, but why should it? It looks like most do. A CPU cooler is made to fulfil a job and Noctua’s BH-U14S certainly does that. You can spot the 6 heat pipes ending and have a nice smooth surface with a discreet company logo.

Noctua NH-U14S DX-3647 Photo view top

Just the Heatsink

We’ll also have a brief look at the heatsink itself. There can be no doubt about the quality by just looking at it. All the fins are perfectly aligned as they should be.

Noctua NH-U14S DX-3647 Photo heatsink view side

Here’s an up-side-down view to show the mounting holes as well as the heat pipe connection to the baseplate.

Noctua NH-U14S DX-3647 Photo heatsink view top pipe connection

Beware of the Clearance

I have mentioned a couple of times already that this cooler can be too large for some dual-socket motherboards. One thing is saying so, another is showing it. As you can see here, the two heatsinks touch, yet I need another centimetre to align it with the socket. If the sockets had been turned, there would be no issues.

Noctua NH-U14S DX-3647 Photo setup too narrow

Into the Details

The NH-U14S DX-3647 has six heat pipes connecting the fins with the contact surface. This shot shows nicely how they take three different routes up the fins.

Noctua NH-U14S DX-3647 Photo details heatpipes

Noctua pre-applies NT-H1 thermal paste, making the installation a breeze. Naturally, you can opt to remove it and add your own favourite kind. But it does a wonderful job, so why? I will remove it for my tests though as we want all our cooler reviews to feature the same methodology.

Noctua NH-U14S DX-3647 Photo details thermal paste

The large 70 x 56mm copper contact surface is more than double the size of the standard model. It is tailored to fit the enormous integrated heat-spreaders (IHS) of Intel’s LGA3647-based processors. A customised design like this allows for an optimal heat flow from the CPU over the base to the heat pipes and on to the cooling fins.


The LGA3647 installation is quite a bit different than your average desktop processor. It might seem odd in the beginning, but once you’ve done it a few times, you’ll wonder why all sockets aren’t made like this.

First, you mount either the narrow or square side brackets. Next, you secure the CPU in the plastic retention bracket.

Noctua NH-U14S DX-3647 Photo details cpu bracket

Then you snap the CPU onto the heatsink and install the whole shebang into the CPU socket.

Noctua NH-U14S DX-3647 Photo details cpu on heatsink

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