Affiliate Disclosure: As an Amazon Associate we earn from qualifying purchases. Some links may earn us a commission at no cost to you.
Will a Noctua NH-D15 Fit in a Fractal North? Yes (2026)
Yes. A Noctua NH-D15 is 165 mm tall and the Fractal Design North takes a 170 mm cooler, so it goes in with 5 mm to spare. That is the easy half of the answer.
Two things can still stop it. Your memory has to be 32 mm or shorter, because that is all the front fan leaves in dual-fan mode. And on the mesh model, mounting the side fan bracket in its top position drops the ceiling from 170 mm to 145 mm, which puts every NH-D15 variant out of the case. Both gates have a cheap fix.
At a glance
Model | Side panel | Side fan bracket | Max cooler height | NH-D15 verdict | Buy |
|---|---|---|---|---|---|
Perforated mesh | Included, three positions | 170 mm bare, 145 mm with the bracket up top | Fits, unless the bracket goes in the top position | ||
Tempered glass | Not in play | 170 mm | Fits, with 5 mm to spare |
- Side panel
Perforated mesh
- Side fan bracket
Included, three positions
- Max cooler height
170 mm bare, 145 mm with the bracket up top
- NH-D15 verdict
Fits, unless the bracket goes in the top position
- Buy
- Side panel
Tempered glass
- Side fan bracket
Not in play
- Max cooler height
170 mm
- NH-D15 verdict
Fits, with 5 mm to spare
- Buy
Verdict by scenario
Your situation | What happens | What to do | Get it |
|---|---|---|---|
Tempered glass model, memory at or under 32 mm | Fits at 165 mm with 5 mm to spare, both fans on | Mount it as shipped | |
Memory taller than 32 mm, cooler already bought | The front fan collides with the heatspreaders | Swap to a 31 mm bare-PCB kit and keep both fans | |
Tall RGB memory you are keeping | No dual-fan configuration clears it at 165 mm | Step to the 160 mm single-fan variant | |
Mesh model, side fan bracket in the top position | The ceiling drops to 145 mm and every NH-D15 is out | Move the bracket to the bottom, or go under 145 mm |
Tempered glass model, memory at or under 32 mm
- What happens
Fits at 165 mm with 5 mm to spare, both fans on
- What to do
Mount it as shipped
- Get it
Memory taller than 32 mm, cooler already bought
- What happens
The front fan collides with the heatspreaders
- What to do
Swap to a 31 mm bare-PCB kit and keep both fans
- Get it
Tall RGB memory you are keeping
- What happens
No dual-fan configuration clears it at 165 mm
- What to do
Step to the 160 mm single-fan variant
- Get it
Mesh model, side fan bracket in the top position
- What happens
The ceiling drops to 145 mm and every NH-D15 is out
- What to do
Move the bracket to the bottom, or go under 145 mm
- Get it
Cooler height against the North's two ceilings
Measured against the Fractal Design North's two cooler ceilings. Everything here clears 170 mm. Nothing here clears 145 mm.
- Noctua NH-D15 G2168 mm
- Noctua NH-D15 chromax.black165 mm
- Noctua NH-D15S chromax.black160 mm
- Thermalright Phantom Spirit 120 SE154 mm
DDR5 module height against the NH-D15's 32 mm gate
Anything above 32 mm forces the front fan up, which raises total cooler height, or off, which costs airflow.
- Crucial 32GB DDR5-5600 (Bare PCB)31 mm
- TEAMGROUP T-Create Expert 10L32 mm
- G.SKILL Flare X533 mm
- Kingston FURY Beast DDR534.9 mm
- Crucial Pro Overclocking DDR535 mm
How we checked the NH-D15 fit in a Fractal Design North
Both halves of this question have a published number. Noctua lists the NH-D15 at 165 mm with both fans mounted, 32 mm of memory clearance in dual-fan mode, and 64 mm with the front fan off. Fractal lists the North at 170 mm of cooler height. Subtract and you have a verdict.
The complication is that the North has two ceilings, not one. The mesh model ships a side fan bracket with three mounting positions, and the top one sits directly opposite the CPU socket. With fans on the bracket there, usable cooler height is 145 mm, which is the number on Fractal's own spec sheet. The middle position is reported to cost the same clearance, so the bottom position is the one to plan around. The tempered glass model has a glass left panel, so the bracket never enters the picture and 170 mm holds. That split is why the same question gets two different answers depending on which model someone owns. If you are populating that bracket, the fans worth putting in a North covers what to mount.
Treat an advertised ceiling as a number to verify. The Lian Li Lancool 216 advertises 180 mm and lands nearer 165 mm once the side panel and ARGB fan tops are on. Measure from your own board tray to the inside of the panel you intend to close. There are four numbers that decide cooler fit, and a case listing usually prints one.
The cooler in question: Noctua NH-D15 chromax.black
Specs
Height | 165 mm |
Width | 150 mm |
Depth with fans | 161 mm |
RAM clearance, dual fan | 32 mm |
RAM clearance, single fan | 64 mm |
Weight with fans | 1,320 g |
Fans | Two NF-A15 140 mm PWM |
Sockets | AM5, AM4, LGA1851, LGA1700 |
Height
165 mm
Width
150 mm
Depth with fans
161 mm
RAM clearance, dual fan
32 mm
RAM clearance, single fan
64 mm
Weight with fans
1,320 g
Fans
Two NF-A15 140 mm PWM
Sockets
AM5, AM4, LGA1851, LGA1700
What it does well
At 165 mm it clears the North's bare ceiling by 5 mm. That is not a tolerance gamble, and the panel closes without persuasion.
Acoustically it is the best thing you can bolt to this chassis. Two NF-A15 fans move enough air at low RPM to hold a 9800X3D in the 70s under a gaming load, and the North's two front Aspect 14 PWM intakes feed the fin stack directly. Noctua backs it for seven years, and SecuFirm2 is the least fiddly mount in the category.
The fin stack is dense enough that it does not need the front fan to work. Pull that fan and you give up a few degrees under sustained load. That is the escape hatch the memory gate depends on.
What you give up
32 mm of memory clearance in dual-fan mode, which is why this article has a second half. Most heatspreader kits are 33 mm to 35 mm, so the shipped configuration collides with them. You can raise the front fan to clear them, but Noctua is explicit that raising it increases total cooler height, and 5 mm is the whole budget.
It is also 150 mm wide and 1,320 g, and the fin stack crowds the top PCIe slot on some boards. And it is the expensive route to this thermal target: the Phantom Spirit below lands within a couple of degrees for a fraction of the outlay. The Noctua premium buys noise floor, finish and support, not temperatures.
Who it's for
A North owner who wants the quietest air cooler the case will take, and who either runs low-profile memory already or is buying memory in the same order. If you game in headphones, read the Phantom Spirit section first.
The RAM that clears the gate: Crucial 32GB DDR5-5600 (Bare PCB)
Specs
Capacity | 32 GB (2 x 16 GB) |
Speed | 5600 MT/s |
Latency | CL46 |
Voltage | 1.1 V |
Module height | 31 mm, bare PCB |
Form factor | 288-pin UDIMM |
Profile support | JEDEC only |
Capacity
32 GB (2 x 16 GB)
Speed
5600 MT/s
Latency
CL46
Voltage
1.1 V
Module height
31 mm, bare PCB
Form factor
288-pin UDIMM
Profile support
JEDEC only
What it does well
A bare-PCB DDR5 module is a standard-height DIMM, roughly 31 mm. Nothing collides, so the front fan stays where Noctua shipped it, the cooler stays at its rated 165 mm, and the 5 mm case margin stays untouched. No fan raising, no single-fan mode, no measuring.
It is also the cheapest fix here. If you own the cooler and your kit is 35 mm, swapping memory costs less than swapping coolers. For more options at this height, the low-profile DDR5 kits under 32 mm round-up has four more.
What you give up
Speed. This is JEDEC 5600 CL46 with no XMP and no EXPO profile, and AM5 wants 6000 CL30. The gap is real in CPU-bound titles, though it reads as single-digit percentages rather than a tier.
And looks. Bare green PCB behind tempered glass is a choice. If it bothers you, the TEAMGROUP T-Create Expert 10L sits at exactly 32 mm with a heatspreader and still clears, which is the narrowest pass in the chart above. One kit to avoid assuming into that group is Crucial Pro: reviewers measure it at 35 mm with its heatspreader, so the premium name does not make it low profile.
Who it's for
Someone who owns the NH-D15, wants both fans on it, and would rather solve 3 mm of clearance with memory than with a new cooler. Skip it if you are buying the platform fresh: the NH-D15S below lets you keep a fast EXPO kit.
The tall-RAM alternative: Noctua NH-D15S chromax.black
Specs
Height | 160 mm |
Width | 150 mm |
RAM clearance | 65 mm |
Fan | One NF-A15 140 mm PWM |
Fin stack | Offset, clears the top PCIe slot |
Mounting | SecuFirm2 |
Sockets | AM5, AM4, LGA1851, LGA1700 |
Height
160 mm
Width
150 mm
RAM clearance
65 mm
Fan
One NF-A15 140 mm PWM
Fin stack
Offset, clears the top PCIe slot
Mounting
SecuFirm2
Sockets
AM5, AM4, LGA1851, LGA1700
What it does well
Same cooler with the memory problem engineered out. One central NF-A15 over recessed lower fins gives 65 mm of clearance, so every kit in the chart above fits underneath with nothing moved.
It is 160 mm rather than 165 mm, which turns the North's 5 mm margin into 10 mm. The offset fin stack clears the top PCIe slot too, worth something on boards that place the first x16 slot high.
What you give up
One fan. Under sustained all-core load it trails the NH-D15 by a few degrees and has to spin harder to match it, which narrows the acoustic advantage you paid for. On a gaming X3D chip that is close to academic. On a 9950X doing renders it is not.
It also does nothing about the side fan bracket. 160 mm is still over the 145 mm ceiling, so no NH-D15 variant answers a top-bracket build.
Who it's for
A North owner who already bought tall RGB memory and is not re-buying it, or anyone speccing fresh who wants Noctua acoustics and a fast EXPO kit at once.
The shorter, cheaper alternative: Thermalright Phantom Spirit 120 SE
Specs
Height | 154 mm |
Width | 125 mm |
Depth | 110 mm |
Heatpipes | Seven 6 mm |
Fans | Two TL-C12 120 mm PWM |
RAM clearance | Offset base, cut-out lower fins |
Sockets | AM5, AM4, LGA1700, LGA1200, LGA115x |
Height
154 mm
Width
125 mm
Depth
110 mm
Heatpipes
Seven 6 mm
Fans
Two TL-C12 120 mm PWM
RAM clearance
Offset base, cut-out lower fins
Sockets
AM5, AM4, LGA1700, LGA1200, LGA115x
What it does well
154 mm leaves 16 mm of headroom under the bare ceiling. The base is offset and the lower fins are cut away, so tall memory clears without dropping to single-fan mode, and the top PCIe slot clears as well. Seven 6 mm heatpipes, two 120 mm PWM fans.
Thermally it sits within a couple of degrees of the Noctua dual-towers, which is why it is this site's default air cooler rather than a budget footnote. If you have not already decided on Noctua, start here and put the difference into a bigger GPU. The air coolers by build tier list has the rest of the ladder.
What you give up
Noise floor and finish. The TL-C12 fans are good, not NF-A15 good, and in a quiet room you hear it under load. Mounting takes longer, and the warranty and support are not in the same league.
It does not rescue a top-bracket build either. 154 mm is over 145 mm too. That configuration needs a cooler under 145 mm, and the coolers under 145 mm list is where to look.
Who it's for
Anyone who wants the clearance question to stop being a question. It fits every North panel configuration but the top-bracket one, clears any memory you own, and leaves money for parts that change frame rates.
Bottom line
If you have the tempered glass North and memory at 32 mm or under, buy the NH-D15 and stop thinking about it. If you are keeping tall RGB memory, buy the NH-D15S. If you want both fans on the NH-D15 and your kit is too tall, swap to a 31 mm bare-PCB kit. If you own the mesh model and want side fans in the top position, no NH-D15 fits and you need something under 145 mm. And if you have not committed to Noctua, the Phantom Spirit 120 SE does nearly all of this for far less.
If the chassis side of the build is still open, how to choose a cooler and case covers the order to make these calls in, and a 360mm AIO in the same chassis is the other way out of a cooler-height problem.
FAQ
What is the maximum CPU cooler height in a Fractal Design North?
170 mm, with one asterisk. That is the figure with nothing mounted to the side fan bracket. The mesh model's bracket mounts in three positions, and the top one sits directly opposite the CPU, which drops usable height to 145 mm. The tempered glass model has a glass left panel and no bracket in play, so 170 mm holds. Check which model you own before trusting either number.
Does the Noctua NH-D15 block RAM slots in the Fractal North?
It does not block the slots, it limits how tall the modules in them can be. In its shipped dual-fan configuration the NH-D15 leaves 32 mm of memory clearance. Bare-PCB DDR5 is about 31 mm and clears. Most heatspreader kits are 33 mm to 35 mm and do not. Pull the front fan and clearance jumps to 64 mm. The case has nothing to do with this one.
Can you use the North's side fans with a Noctua NH-D15?
Only with the bracket in its lowest position. The bracket has three mounting positions, and the top one sits directly opposite the CPU socket, where fans cut usable cooler height to 145 mm against the NH-D15's 165 mm. The middle position is reported to cost the same clearance, so treat the bottom as the only safe one and measure before you close the panel. This applies to the mesh model only.
Will a Noctua NH-D15 G2 fit in a Fractal Design North?
Yes, by 2 mm. The G2 is 168 mm against the North's 170 mm, which is a pass but a thin one, so measure your own panel gap first. Its memory clearance is the same 32 mm in dual-fan mode, so the RAM gate does not change. The bracket rule applies too. For the same cooler in a chassis with the same ceiling, see the same gate in a Corsair 4000D.
Is the NH-D15S better than the NH-D15 for the Fractal North?
Better if your memory is tall, worse if it is not. The NH-D15S is 160 mm rather than 165 mm and gives 65 mm of memory clearance rather than 32 mm, because it runs one central fan over recessed fins. That retires the RAM question. The trade is one fan: under all-core load it trails the NH-D15 by a few degrees. On a gaming X3D chip that barely registers.
Do you need to remove the NH-D15's front fan in a Fractal North?
Only if your memory is taller than 32 mm and you are keeping it. Removing the front fan raises clearance to 64 mm and leaves total height at 165 mm, so the case is still fine. Raising the fan instead also clears the memory, but Noctua states that raising it increases total cooler height. If neither appeals, the NH-D15S does the job in one part.
Related Articles
Will a Noctua NH-D15 G2 Fit in a Corsair 4000D? (2026)
Yes, the Noctua NH-D15 G2 will fit a Corsair 4000D by 2mm. The real gate is RAM height: 32mm in dual-fan mode. Here are the kits and coolers that clear it.
Aug 10, 2026
Will a 360mm AIO Fit in a Fractal Design North? (2026)
Will a 360mm AIO fit in a Fractal Design North? Yes, front only, and it costs you GPU length. The full clearance matrix plus the AIOs that actually fit.
Aug 11, 2026
Best Fans for the Fractal Design North (2026): 5 Picks
The best fans for the Fractal Design North, matched to its real mount map: five picks from budget to premium, plus the intake and exhaust layout to run.
Aug 22, 2026
Best Low-Profile DDR5 RAM for Air Coolers (2026): 5 Kits
Five low-profile DDR5 kits, 31 to 34 mm tall, that clear the NH-D15 G2, Peerless Assassin, and AK620 front fans. Cooler-height table first, picks by tier.
Aug 27, 2026
CPU Cooler Clearance: 4 Numbers That Decide Fit (2026)
CPU cooler clearance explained: what your case spec really means, the margin to leave, RAM height under the fan, and two coolers that fit tight builds.
Sep 17, 2026