Cooler Master is a name synonymous with mainstream cooling products, ranging from heatpipe air towers to performance liquid cooling AIOs, many of which feature RGB lighting as a focal point. However, the large, dual-fan MasterAir MA624 Stealth comes ready to impress while being completely devoid of lighting accents. Instead, it features an all-blck color scheme for an imposing look for those who favor their flair without the flash. It also makes use of some smart integrated mounting and includes a third (bonus!) 120mm fan to allow a bit more flexibility for systems with tall memory DIMMs.
Striking an appealing balance somewhere between thermal mitigation and aesthetic prominence, the Cooler Master MasterAir MA624 Stealth is a sharp-looking performer.
| Height | 6.5" / 165.1mm |
| Width Depth | 5.88" / 149.4mm |
| Depth | 5.0" / 127.0 mm (6.125" / 155.6mm w/fan) |
| Base Height | 1.25" / 31.8mm |
| Assy. Offset | 0.0 (centered), 1.125" / 28.6mm w/ front fan) |
| Cooling Fans | (2) 140 x 25mm |
| (1) 120 x 25mm | |
| Connectors | (2) 4-pin PWM |
| Weight | 46.3 oz / 1312g |
| Intel Sockets | 1366, 115x, 1200, 2011x, 2066 |
| AMD Sockets | FM2(+), FM1, AM2(+), AM3(+), AM4 |
| Warranty | 5 years |
| Web Price | $100 |
Cooler Master’s MasterAir MA624 Stealth comes with a healthy installation kit which supports nearly all current-gen Intel and AMD desktop processors--with the exception of Threadripper silicon. Mounting hardware includes plated brackets, standoffs and tension screws, as well as universal backplate. A small tube of MasterGel accompanies a universal Phillips screwdriver and 2-way PWM fan splitter.
Cooler Master covers the MasterAir MA624 Stealth with a 5 year warranty.
The MasterAir MA624 Stealth utilizes six copper heatpipes, which run from the base up through a pair of cooling fin stacks, which sit astride an integrated 140mm SickleFlow fan that’s capped below a brushed-aluminum top. A pair of spring-tensioned mounting bolts extend from the top of the cooler down through the base mount to secure the cooler against the motherboard cross brackets.
Cooler Master includes a pair of 140mm SickleFlow fans (center + front) as well as an extra 120mm for alternate setups. This allows the MA624 Stealth to function as a silent single-fan (center) setup for maximum memory clearance, or in the standard installation of push+pull using the 140mm front-mount SickleFlow fan.
Swapping the snap brackets to the additional 120mm SickleFlow fan allows for better memory clearance while still allowing a push+pull setup. The extra 120mm or 140mm fan can be used for push+pull+pull cooler setup (with an additional fan mount), or as a chassis fan for airflow elsewhere.
Cooler Master rates the 140mm fans up to 1400 RPM, while the 120mm is expected to see speeds up to 1800 RPM.
The base of the Cooler Master MasterAir MA624 Stealth sandwiches all six copper heatpipes between the mounting block and the 40mm x 40mm milled cooler cold plate.
The cold plate is milled flat and shows zero sign of any background lighting peeking between the cooler and our steel ruler.
From this view, the integrated mounting arms and spring tension screws are easily seen, while the center-mounted 140mm SickleFlow fan seats down into a clever notch carved into the mounting system.
Even tension makes for an evenly distributed thermal compound spread, compressing and dispersing our application of Arctic MX-4 during installation.
Mounting the Cooler Master MasterAir MA624 Stealth is relatively simple: Once the backplate or appropriate offsets are secured, the motherboard cross mounts are laid over and then tensioned into place. The pair of vertical spring tension screws align over the cross mounts, which align directly over threaded holes below. Single fan only (center-mount) is complete, or the front-mount 140mm (or 120mm) can be snapped to the front of the MA624 Stealth to complete the standard push+pull installation.
For our CPU cooling tests, we use the same hardware, overclock and configuration for each test to minimize environment variables in testing. This allows for all results across all coolers tested on the platform to be viable as side-by-side examination for direct compare/contrast.
| CPU | Intel i9-10850k LGA1200 (Comet Lake), all 10 cores 4.6Ghz @ 1.190v |
| (3.60Ghz stock speed, single core boost @ 5.2Ghz) | |
| Motherboard | MSI Z490 MEG Godlike (bios vers. 7C70v12) |
| Memory | Corsair Vengeance LPX, 32GB (4x8GB) DDR4-3000 |
| Storage | Corsair MP600 m.2 2280 NVMe, 500GB |
| Graphics | Gigabyte GTX 1050Ti |
| Power Supply | be quiet! Dark Power Pro11 1200w |
| Chassis | Corsair Graphite 760T |
| Monitoring | CrystalFontz CFA-633-TMI-KU |
| 4x Dallas One Wire WR-DOW-Y17 sensors | |
| Fan Control | Corsair Commander Pro, 100%/50% PWM Speed profiles (liquid cooling pump always @100%, if applicable) |
| OS | Windows 10 Pro 64bit |
| Networking | Disconnected, not used |
| Thermal Compound | Arctic MX-4 |
Comparisons are based on data collected from testing performed on our Intel i9-10850k system, including re-visiting many previously covered products which were originally covered on the prior testing platform which pivoted around an i7-5930k (4.20ghz @1.20v).
All data reported here has been collected on the current Intel i9-10850k platform and will be maintained as like-for-like evaluation of ongoing cooling coverage. We’ve recently swapped the taller, Corsair Dominator RGB DIMMs with Corsair Vengeance LPX for lower-profile memory allowing for higher cooler compatibility for testing.
Prime95 v29.4b8 (no AVX) is used for two-hour intervals, one managing fans at 50% PWM and the other at 100% PWM with RPM measurements being taken every 3 seconds and averaged across the duration of each 2-hour capture. Omitting AVX instruction sets allows for accurate, 100% loads at chosen clock speeds, while allowing AVX instructions would provide higher, albeit, unrealistic synthetic CPU loads and excessive heat production, less indicative of real-world use.
This also allows for a greater range CPU coolers to be tested and compared without the need to configure the system differently for smaller coolers which may not handle the excessive thermal loads being generated during testing, while larger coolers might be better equipped to manage heat output produced by the i9-10850k.
While the test platform is quite capable of a 10-core overclock at 5.0Ghz and 1.265v, we were seeing 360mm AIOs struggle to keep core temperatures in check at lower fan speeds, providing insight that the enthusiast-grade i9s need excellent cooling if the goal is overclocking.
HWInfo64 is used for real-time core temperature readout, thermal throttling alerts, motherboard power consumption, CPU speed and logging of data, while a CrystalFontz CFA-633-TMI-KU is used to monitor and later average both ambient room (2 probes) and motherboard voltage regulator heatsink (2 probes).
With these temperature readings collected, CPU Core is defined as an average of all CPU core temperatures, reported once per second for the entirety of the testing run from HWInfo64 data. This value is then taken as an offset difference from the reported ambient room temperature collected from the CFA-633-TMI-KU (also once per second and averaged). CPU PWM is defined by the voltage regulator heatsink direct temperature probe, as an offset different from the same reported ambient room temperature reading for the same CPU Core test (100%, 50%). This helps define a working model of how well the evaluated cooler performs as a process of also cooling nearby hardware also under load, like our overclocked motherboard voltage regulator heatsink.
The Cooler Master MasterAir MA624 Stealth holds steady ground with some of the best large heatpipe air coolers we’ve tested, as well as performing just as comparably with some of high-performing 240mm AIOs.
Making use of that pair of large 140mm SickleFlow fans, the MA624 Stealth, slower fan speeds move a lot of air over the large set of twin heatpipe towers, similar to the Noctua NH-D15, Deep Cool Assassin III and be quiet! Dark Rock Pro 4.
By utilizing larger, slower-speed 140mm fans, Cooler Master’s MA624 Stealth reaches very low registered noise levels, nearly as silent as the Noctua NH-D15 and be quiet! Dark Rock Pro 4.
The remaining coolers using 120mm fans with much faster rotational speeds see higher decibel readings.
We see the larger heatpipe air coolers doing very well here due to their noise level advantage, while also remaining very competitive with the larger (but noisier) liquid coolers.
Priced right around $100 at time of writing, the Cooler Master MA624 Stealth is certainly expensive for an air cooler, but it’s in the same territory as our other high-end heatpipe coolers listed here. This is also the same pricing plateau we see many of our performance 240mm AIOs start at, but the AIO coolers then scale sharply upwards as we move into 360mm liquid coolers and more specialized offerings like the IceGiant ProSiphon Elite.
Thermal imaging with our FLIR ONE Pro shows nominal differences between 100% and 50% fan PWM for the Cooler Master MasterAir MA624 Stealth. We can see the heat soak difference between the front/fan side of the cooler (right side) in each photo, where the inlet fan feeds ambient chassis air into the heatsink towers and a gradual blaze of warmth as expelled heat exists the rear (left side) of the cooler in each image. Even so, the MasterAir MA624 Stealth dissipates heat evenly across the cooler at each fan speed setting.
Cooler Master has pulled out all the stops to release an excellent option in the large heatpipe cooler arena, trading blows with some of the best CPU coolers we’ve tested. While it doesn’t glitter with RGB lighting, it shines as an effective near-silent thermal solution for some of the most potent desktop CPUs from both Intel and AMD--as long as you don’t count Threadripper.
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