Buying Guide
The Best Workstation CPU Coolers
Five air coolers compared, from the Dark Rock Pro 5 to the NH-D15 G2 chromax.black, with the trade-offs of each named.
By The PC Journal editorial team
12 min read5 products evaluated
A workstation cooler has to run at full load for hours without pump wear to worry about. Every pick is an air cooler with seven or more heat pipes or Noctua's NH-D15 design.
This is a research roundup, not a lab test: heat pipes, fan size and fans included come from each maker's published specs; a missing heat pipes is flagged, not filled in, and no figure here comes from our own testing.
Quick Picks
Our 5 recommendations at a glance. Tap a pick for the full verdict.
Premium Pick
Noctua NH-D15 G2 chromax.black
The highest-priced pick here at the time of writing, with an all-black finish on Noctua's second-generation NH-D15.
Best for: Buyers who want the most complete package.
Our take Check price for Noctua NH-D15 G2 chromax.black (opens in a new tab)
Also Consider
Noctua NH-D15 G2
An offset design whose recessed lower fins clear the top PCIe slot.
Best for: Buyers who want offset design whose recessed lower fins clear the top PCIe slot.
Our take Check price for Noctua NH-D15 G2 (opens in a new tab)
Strong Alternative
be quiet! Dark Rock Pro 6
A 300W TDP rating.
Best for: Buyers who want 300W TDP rating.
Our take Check price for be quiet! Dark Rock Pro 6 (opens in a new tab)
Worth a Look
Noctua NH-D15S chromax.black
An asymmetrical dual-tower heatsink with 65mm RAM clearance.
Best for: Buyers who want asymmetrical dual-tower heatsink with 65mm RAM clearance.
Our take Check price for Noctua NH-D15S chromax.black (opens in a new tab)
Lowest Price Here
be quiet! Dark Rock Pro 5
Undercutting the NH-D15S chromax.black on price when we checked.
Best for: Buyers who would rather put the savings elsewhere in the build.
Our take Check price for be quiet! Dark Rock Pro 5 (opens in a new tab)
| Pick | Why it’s here | Best for | Price |
|---|---|---|---|
| The highest-priced pick here at the time of writing, with an all-black finish on Noctua's second-generation NH-D15. | Buyers who want the most complete package. | Check price for Noctua NH-D15 G2 chromax.black (opens in a new tab) |
| An offset design whose recessed lower fins clear the top PCIe slot. | Buyers who want offset design whose recessed lower fins clear the top PCIe slot. | Check price for Noctua NH-D15 G2 (opens in a new tab) |
| A 300W TDP rating. | Buyers who want 300W TDP rating. | Check price for be quiet! Dark Rock Pro 6 (opens in a new tab) |
| An asymmetrical dual-tower heatsink with 65mm RAM clearance. | Buyers who want asymmetrical dual-tower heatsink with 65mm RAM clearance. | Check price for Noctua NH-D15S chromax.black (opens in a new tab) |
| Undercutting the NH-D15S chromax.black on price when we checked. | Buyers who would rather put the savings elsewhere in the build. | Check price for be quiet! Dark Rock Pro 5 (opens in a new tab) |
Our Picks
Premium Pick1 of 5
Noctua NH-D15 G2 chromax.black on Amazon (opens in a new tab)
The NH-D15 G2 chromax.black is Noctua's second-generation flagship in black, with eight heat pipes and two NF-A14x25r G2 fans.
Best for
- Buyers who want the most complete package.
Skip if
- Skip it if price comes first: the Dark Rock Pro 5 cost less when we checked.
Why we like it
Its offset design clears the top PCIe slot and leaves 59mm for RAM. It matches the NH-D15 G2 on heat pipe count (8). It also brings 140mm fans that can spin slower for the same airflow.
Worth noting too: mounts on both AM5 and Intel LGA1851. The nearest alternative on fan size is the Dark Rock Pro 6 at 135mm, against 140mm here. It makes the most sense for buyers who want the most complete package, since it offers the highest-priced pick here at the time of writing, with an all-black finish on Noctua's second-generation NH-D15. At our last price check it topped the group, with the NH-D15 G2 the nearest cheaper option.
Key dimensions & specs
- Heat pipes: 8
- Fan size: 140mm
- Fans included: 2
- Sockets named: AM5, AM4, LGA1851, LGA1700
Pros
- 8 heat pipes
- 140mm fans that can spin slower for the same airflow
- Two fans included
- Mounts on both AM5 and Intel LGA1851
Cons
- Costs more than the Dark Rock Pro 5 at the time of writing
Also Consider2 of 5
Noctua NH-D15 G2 on Amazon (opens in a new tab)
The NH-D15 G2 is Noctua's flagship: eight heat pipes, two 140mm fans and a six-year warranty.
Best for
- Buyers who want offset design whose recessed lower fins clear the top PCIe slot.
Skip if
- Price-first buyers should look at the Dark Rock Pro 5, which cost less when we checked.
Why we like it
Its offset design keeps the top PCIe slot clear, but it is a large cooler, so check your case first. Its fans have a speed offset for acoustic fine-tuning, and there is 20% more fin area than the original NH-D15. On heat pipe count it ties with the NH-D15 G2 chromax.black at 8.
You also get 59mm RAM clearance with one fan fitted and NT-H2 paste in the box. Another plus is 140mm fans that can spin slower for the same airflow. Its price falls between the Dark Rock Pro 6 and the NH-D15 G2 chromax.black, based on our last check.
Key dimensions & specs
- Heat pipes: 8
- Fan size: 140mm
- Warranty: 6-year
- Fans included: 2
- Sockets named: AM5, AM4, LGA1851, LGA1700
Pros
- 8 heat pipes
- 140mm fans that can spin slower for the same airflow
- 6-year warranty
- Two fans included
Cons
- Costs more than the Dark Rock Pro 5 at the time of writing
Strong Alternative3 of 5
be quiet! Dark Rock Pro 6 on Amazon (opens in a new tab)
The Dark Rock Pro 6 is be quiet!'s newest dual tower, rated at 300W, with a switch between maximum cooling and quiet modes.
Best for
- Buyers who want 300W TDP rating.
Skip if
- Skip it if fan size matters most to you; the NH-D15 G2 chromax.black offers 140mm.
Why we like it
Its mode switch picks maximum cooling or a semi-passive mode that stops the fans below 40% PWM. Seven copper heat pipes carry the heat. A pre-installed mounting bridge and rail-mounted front fan make installation easier, and the fan height adjusts for tall RAM.
It comes with liquid metal thermal grease in the box. It matches the Dark Rock Pro 5 on heat pipe count (7). Its 135mm fan size is the smallest in this group; the NH-D15 G2 chromax.black leads at 140mm.
It also brings two fans included. It was priced above the NH-D15S chromax.black and below the NH-D15 G2 at the time of writing.
Key dimensions & specs
- Heat pipes: 7
- Fan size: 135mm
- Fans included: 2
Pros
- 7 heat pipes
- Two fans included
- 300W TDP rating
- Active mode switch for maximum cooling or quiet operation
Cons
- Fan size trails the NH-D15 G2 chromax.black (140mm)
- Costs more than the Dark Rock Pro 5 at the time of writing
Worth a Look4 of 5
Noctua NH-D15S chromax.black on Amazon (opens in a new tab)
The NH-D15S keeps the dual-tower heatsink but drops to one 140mm fan, which buys 65mm of RAM clearance and a clear top PCIe slot.
Best for
- Buyers who want asymmetrical dual-tower heatsink with 65mm RAM clearance.
Skip if
- The maker gives no heat pipe count, so look elsewhere if that figure decides it for you.
Why we like it
At 160mm tall it fits most tower cases. On fan size it ties with the NH-D15 G2 chromax.black and the NH-D15 G2 at 140mm. You also get an all-black finish.
Check that your case offers at least 160mm of CPU cooler clearance before ordering. Another plus is 140mm fans that can spin slower for the same airflow. It also brings mounts on both AM5 and Intel LGA1851.
Its price falls between the Dark Rock Pro 5 and the Dark Rock Pro 6, based on our last check. Buyers who need a confirmed heat pipe count should compare it with the NH-D15 G2 chromax.black, which offers 8.
Key dimensions & specs
- Fan size: 140mm
- Height: 160mm
- Fans included: 1
- Sockets named: AM5, AM4, LGA1851, LGA1700
Pros
- 140mm fans that can spin slower for the same airflow
- Mounts on both AM5 and Intel LGA1851
- Asymmetrical dual-tower heatsink with 65mm RAM clearance
- Single NF-A15 140mm PWM fan
Cons
- No published heat pipe count
- Costs more than the Dark Rock Pro 5 at the time of writing
Lowest Price Here5 of 5
be quiet! Dark Rock Pro 5 on Amazon (opens in a new tab)
The Dark Rock Pro 5 is be quiet!'s quiet-first dual tower, with seven heat pipes, Silent Wings fans and a switch that trades speed for silence.
Best for
- Buyers who would rather put the savings elsewhere in the build.
Skip if
- Skip it if heat pipe count matters most to you; the NH-D15 G2 chromax.black offers 8.
Why we like it
Check its height on be quiet!'s site against your case. Seven copper heat pipes and a ceramic-particle black coating aid cooling, and two Silent Wings PWM fans use fluid-dynamic bearings. It is built to stay quiet under load.
On heat pipe count it ties with the Dark Rock Pro 6 at 7. It makes the most sense for buyers who would rather put the savings elsewhere in the build, since it offers undercutting the NH-D15S chromax.black on price when we checked. It was the cheapest of the group when we checked; the NH-D15S chromax.black was the next step up. If heat pipe count is your priority, the NH-D15 G2 chromax.black (8) is the stronger choice.
Key dimensions & specs
- Heat pipes: 7
- Fans included: 2
Pros
- 7 heat pipes
- Two fans included
- Speed Switch for quiet or performance fan modes
- Silent Wings PWM fans
Cons
- Heat pipe count trails the NH-D15 G2 chromax.black (8)
- No published fan size
How We Chose These Workstation CPU Coolers
Each pick was assessed across 4 criteria weighted for real-world use.
- Cooling hardware
- We noted heat pipes, fan size and fan count from each listing.
- Support
- We recorded warranty length where the maker states it.
- Sockets
- We checked that each maker names current AM5 and Intel LGA1851 support.
- Fit
- We compared listed heights and footprints, since case and RAM clearance decide what fits.
What to Look for in a Workstation CPU Cooler
Key buying criteria so you get the right fit the first time.
Decide on fan size first
Among these picks, fan size runs from 135mm on the Dark Rock Pro 6 to 140mm on the NH-D15 G2 chromax.black. Match this to what you will actually do with it, then let price decide between the picks that qualify.
Check the cooler height against your case
Every case offers a maximum CPU cooler height. Tower coolers run from about 150mm to 170mm, and low-profile coolers from under 40mm to about 70mm.
Leave a few millimetres for the side panel.
Size the cooler to the CPU
A 65W chip runs well on a single tower or a good low-profile cooler. Chips rated at 120W to 170W need a dual tower or an AIO to hold their boost clocks without loud fans.
Bigger fans can spin slower
140mm fans move the same air as 120mm fans at lower speed, so larger coolers are often quieter at the same load.
Fan curves in the BIOS matter as much as the cooler.
Watch RAM clearance
Large towers and low-profile coolers can overhang the memory slots. Tall RAM heatsinks may force you to raise a fan or pick a slimmer cooler.
Makers publish RAM clearance figures; check them against your memory's height.
How to Choose a Workstation CPU Cooler
By priority
| Priority | Consider | Why |
|---|---|---|
| Buyers who want the most complete package | NH-D15 G2 chromax.black | The highest-priced pick here at the time of writing, with an all-black finish on Noctua's second-generation NH-D15 |
| Buyers who want offset design whose recessed lower fins clear the top PCIe slot | NH-D15 G2 | An offset design whose recessed lower fins clear the top PCIe slot |
| Buyers who want 300W TDP rating | Dark Rock Pro 6 | A 300W TDP rating |
| Buyers who want asymmetrical dual-tower heatsink with 65mm RAM clearance | NH-D15S chromax.black | An asymmetrical dual-tower heatsink with 65mm RAM clearance |
| Buyers who would rather put the savings elsewhere in the build | Dark Rock Pro 5 | Undercutting the NH-D15S chromax.black on price when we checked |
Scroll sideways to see every column.
Key specs side by side
Figures as each maker states them.
| Cooler | Heat pipes | Fan size | Fans included | Sockets named |
|---|---|---|---|---|
| NH-D15 G2 chromax.black | 8 | 140mm | 2 | AM5, AM4, LGA1851, LGA1700 |
| NH-D15 G2 | 8 | 140mm | 2 | AM5, AM4, LGA1851, LGA1700 |
| Dark Rock Pro 6 | 7 | 135mm | 2 | Not listed |
| NH-D15S chromax.black | Not listed | 140mm | 1 | AM5, AM4, LGA1851, LGA1700 |
| Dark Rock Pro 5 | 7 | Not listed | 2 | Not listed |
Scroll sideways to see every column.
By price at the time of writing
Prices change often; these tiers reflect Amazon prices when this guide was updated.
| Price tier | Coolers |
|---|---|
| About $50 to $100 | Dark Rock Pro 5 |
| About $100 to $150 | NH-D15S chromax.black, Dark Rock Pro 6 |
| About $150 to $250 | NH-D15 G2, NH-D15 G2 chromax.black |
Frequently Asked Questions
Which of these air coolers has the highest heat pipe count?
The NH-D15 G2 chromax.black leads at 8, ahead of the NH-D15 G2 at 8; the Dark Rock Pro 5 sits at the other end with 7.
What is the least I can spend on one of these air coolers?
The Dark Rock Pro 5 cost the least when we checked, and the NH-D15 G2 chromax.black sat at the top of the range. Prices move often, so check the current listing before buying.
Is an air cooler as good as an AIO?
A large dual-tower cooler matches many 240mm AIOs and has no pump to fail. AIOs help with very hot CPUs and free up space around the socket.
What cooler does a 65W CPU need?
A single-tower cooler handles it easily; a good low-profile cooler works in small cases.
Which way should the fans face?
Point the airflow from the front of the case towards the rear exhaust fan. Most tower coolers mount this way by default.
Bottom Line
Our first pick is the NH-D15 G2 chromax.black, chosen for the highest-priced pick here at the time of writing, with an all-black finish on Noctua's second-generation NH-D15. Look at the NH-D15 G2 for an offset design whose recessed lower fins clear the top PCIe slot, the Dark Rock Pro 6 for a 300W TDP rating and the NH-D15S chromax.black for an asymmetrical dual-tower heatsink with 65mm RAM clearance if those matter more to you.
Air coolers avoid pump failure, which matters for a machine that renders overnight.