With the two coolers MA612 Stealth and MA624 Stealth, Cooler Master offers two high-quality products that not only belong to the top price range, but also clearly stand out from most competing products due to their features – this is made clear by the lack of RGB lighting and the decision to use black anodized aluminum as the dominant element. What exactly the two devices can do and whether they meet the high expectations that are generally placed on them and especially on the MA624 Stealth, you can find out in our review.
| Cooler Master MasterAir MA612 Stealth | Cooler Master MasterAir MA624 Stealth | |
| Cooler type | Single-tower air cooler with push-pull fan configuration | Dual tower air cooler with two fans |
| Dimensions (with fans) | 129 x 112.2 x 158 mm (L x W x H) | 144.9 x 153.2 x 160 mm (L x W x H) |
| Weight (with fans) | 1.19 kg | 1.62 kg |
| Material | Bottom plate: copper Cooling fins: Aluminum |
Bottom plate: copper Cooling fins: Aluminum |
| Heatpipes | six 6-mm heatpipes | six 6-mm heatpipes |
| Series ventilation | two SickleFlow 120, 120mm fans with PWM, 650 – 1800 rpm | 2x 140 mm PWM with 650 – 1400 rpm. as an alternative option for outside 1x 120 mm PWM with 650 – 1800 rpm |
| Socket | AMD: AM4, AM3(+), AM2(+), FM2(+), FM1 Intel: LGA 2066, 2011(-v3), LGA1200, LGA1366, LGA115x |
AMD: AM4, AM3(+), AM2(+), FM2(+), FM1 Intel: LGA 2066, 2011(-v3), LGA1200, LGA1366, LGA115x |
| Guarantee period | five years | five years |
| price | € 46.05 * | € 109.63 * |
Scope of delivery
The two fans were delivered in two purple boxes, on which there are images of the assembled fans and the individual elements that make them up. Included in each box are a plastic backplate to which mounting bolts with plastic flaps can be attached, mounting tools, thermal paste, as well as an accompanying dispensing syringe, a Y-adapter for mounting PMW fans, and instructions for assembling the fans. The only difference between the two models in terms of what is included is that the MA624 Stealth also comes with a Phillips screwdriver, a third fan, and four case fan screws.
Design and workmanship
Once unpacked, the differences between the two coolers are clear: the MA624 Stealth is significantly larger than the second test model. There is also the fact that the MA612 comes factory-equipped with two 120mm fans, while the MA624 comes with a choice of two 140mm fans or one 140mm and one 120mm fan. Regardless of the size, the two coolers present themselves very similarly. The black aluminum fins are especially characteristic.
The smaller MA612 Stealth cooler is also notable for its pronounced asymmetry, which should increase compatibility with different sockets. The MA624 Stealth, on the other hand, has a symmetrical design and is significantly more powerful than the other test model.
Both coolers stand out with their aluminum covers emblazoned with the manufacturer’s logo in the center. The sturdy and high-quality cover makes the units look classy, which sets them apart from much of the competition.
Both coolers also feature a base plate made of nickel-plated copper, as well as six six-millimeter heat pipes each. All elements are of high quality workmanship. In addition, there are two 120-mm fans for the smaller cooler and two 140-mm fans and one 120-mm fan for the larger cooler.
Assembly
The assembly turns out to be largely uncomplicated in our practical test. We only had to put up with minor inconveniences. The smaller fan could be screwed on well at first – the solution with the plastic flaps is probably not the most durable; however, the assembly succeeds without technical know-how or a larger toolbox. To mount the cooler, we first had to attach two mounting bars with knurled nuts to the mounting bolts so that we could then screw the cooler to the bars. We could only attach the fan after removing the RAM bars, but high RGB RAM is also compatible. It should be noted here that Cooler Master relies on plastic brackets to attach the fans, which is rather unusual. Also, the fans have to be removed before screwing the heatsink in place, which is a bit annoying.
Mounting the larger cooler went similarly. However, the mounting tabs used differ from those of the MA612 Stealth and the mounting screws must be tightened to the cover unlike the small cooler. Even without a fan, the MA624 Stealth overhangs the outer RAM slot; with taller RAM bars, the fan can slide up relatively far due to this overlap. This in turn ensures that compatibility with smaller cases is limited – after all, there is usually little clearance here. However, Cooler Master itself draws attention to this problem and points out that a fan height of 17.4 and no longer 16 centimeters has to be reckoned with for 40 mm high RAM bars. It should also be noted here that the cooler can also be operated with a single fan.
Practical test
Of course, we not only installed the coolers, but also tested them in terms of their performance. For this we used the following system:
| Processor: | Intel i9-10850k |
| Mainboard: | Asus ROG Strix Z490-F Gaming |
| RAM: | 16GB Corsair Venegance RGB PRO 3200 |
| Graphics card: | MSI GeForce RTX 2070 Super Ventus GP OC |
| Power supply: | Seasonic Focus Gold 450W |
Ahead, some information about the fans: the 120mm fans of the MA612 Stealth reach speeds between 650 and 1,800 rpm, while the 140mm models of the MA624 Stealth can be run at speeds between 650 and 1,400 rpm.
Overall, the coolers were able to show strong performance:
| Scenario | Temperature |
| MA612 | 60 °C (50% PWM), 55 °C (100% PWM |
| MA624 (one 140 mm fan) | 56 °C (50% PWM), 52 °C (100% PWM) |
| MA624 (two 140 mm fans) | 53 °C (50% PWM), 49 °C (100% PWM) |
| Arctic Liquid Freezer II 240 | 68 °C (50% PWM), 62 °C (100% PWM) |
| SilentiumPC Grandis 3 EVO ARGB | 70 °C (50% PWM), 63 °C (100% PWM) |
The performance is well above average, so we can state that the two coolers can also meet the very high expectations, which are stoked by the price, among other things.
Conclusion
Overall, these are two outstanding fans that are clearly in the top tier of CPU coolers currently available, not only in terms of price, but also in terms of performance. They could not only convince us in practical use without restrictions, but also stood out due to the impeccable workmanship and elegant design. Only slight mounting difficulties can be noted as a negative point. However, this point of criticism is in no way able to tarnish the otherwise all-around positive picture.
Cooler Master MA624 Stealth & Cooler Master MA612 Stealth
Design and workmanship
Assembly
Performance
Value for money
95/100
Very powerful and elegant coolers of the upper class.
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