Friday, January 8th 2021

Cooler Master MasterAir MA624 Stealth Will be Hard to Miss Once Installed

Cooler Master unveiled the MastarAir MA624 Stealth CPU cooler in Hong Kong. The company's latest dual aluminium fin-stack cooler is massive, measuring 144.9 mm x 153.2 mm x 160 mm (WxDxH). It features two aluminium fin-stacks skewered by six 6 mm-thick nickel-plated copper heat pipes. Included with the cooler are three fans, of which two are SickleFlow 140 mm, and the third SickleFlow 120 mm. In its typical configuration, the 140 mm spinners are take up the middle (convey) and last (pull) positions, while the 120 mm takes up the first (push) position, 70 mm clearance for tall memory modules. For those with standard height memory, 140 mm fans can take up push and convey, with the 120 mm fan pulling in from the end. In its "stealthiest" config, you can just put one 140 mm fan in the middle.

Each of the two SickleFlow 140 mm fans included with the MA624 Stealth turns between 650 to 1,400 RPM, pushing up to 67 CFM of air-flow, 10-27 dBA noise output, and 2.25 mm H₂O static pressure. The 120 mm spinner does 650 to 1,800 RPM, pushing up to 62 CFM of air-flow, 8-27 dBA noise output, and 2.50 mm H₂O static-pressure. The six heat-pipes converge at the base, making indirect contact with the CPU over a copper base. The two fin-stacks are topped off by a brushed aluminium top-plate, which is detachable. Among the CPU socket types supported are AM4, LGA1200, LGA2066, and LGA115x. The MA624 Stealth started selling in Hong Kong for HKD $785 (converts to roughly USD $101).
Sources: Ramboxs, momomo_us (Twitter)
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20 Comments on Cooler Master MasterAir MA624 Stealth Will be Hard to Miss Once Installed

#1
ZoneDymo
badass looking, I would probably run it without the front fan myself but not going to get it anyway, too expensive.

(also for being stealth, I wish you could remove the logo, like it was some magnet or something)
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#2
dj-electric
That heatsink design looks...

...Familiar
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#3
Chaitanya
ZoneDymobadass looking, I would probably run it without the front fan myself but not going to get it anyway, too expensive.
I won't mind running both fans but front fan relocated to rear just to clear tall rams. I would still wait for reviews as their previous 100$ HSF MA620M was a big let down.
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#4
thegnome
Perhaps if they make more proper coolers like these they can actually compete much better with Be Quiet and Noctua. (if the performance is on point)
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#5
owen10578
That looks like a carbon copy of the NH-D15. But that's not necessarily a bad thing.
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#6
Chrispy_
The coldplate looks tiny but actually it's just that the heatsink is a big boy. Too big for my liking, but I know some people are fine with hanging 1.5Kg off their socket.

At least it comes in at under 160mm tall. Plenty of cases will struggle to acommodate more than that....
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#7
Vayra86
Cooler Master has a lot to learn about quality

That underside there looks plasticky, but maybe its not, either way its not coated too well and placed at a slight angle and one of those clips is touching the center fan while the other is not.

You can also see that top plate isn't oriented at a perfect 90 degree angle on the other pics, and even dents a layer of the heatsink.

Pass

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#8
thegnome
Vayra86Cooler Master has a lot to learn about quality

That underside there looks plasticky, but maybe its not, either way its not coated too well and placed at a slight angle and one of those clips is touching the center fan while the other is not.

You can also see that top plate isn't oriented at a perfect 90 degree angle on the other pics, and even dents a layer of the heatsink.

Pass

Cooler Master quality is fine for most people, obviously not amazing, but good enough for the most people out there.

There's enough cases with imperfections, especially on a real unit that has been handeled. Haven't seen a cooler without small imperfections like you described.
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#9
Octavean
owen10578That looks like a carbon copy of the NH-D15. But that's not necessarily a bad thing.
Not at all a bad thing.

They can innovate but if they do they better get it right. The Corsair A500 cooler was a nice try but ultimately had design and implementation flaws. Hence the drop from ~$89.99 to ~$29 USD.

Ripoff a well known and effective design for the Win!!!!

Then try to beat the competition on price and finishes,...
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#10
DeathtoGnomes
dj-electricThat heatsink design looks...

...Familiar
its got a hat on it, wonder if its made outta tinfoil.. :shadedshu:

--

Ya know they push this hype for a "new" product, wags its e-peen about size and then spooges all over about the fans and totally forgot to mention TDP
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#11
freeagent
DeathtoGnomesits got a hat on it, wonder if its made outta tinfoil.. :shadedshu:

--

Ya know they push this hype for a "new" product, wags its e-peen about size and then spooges all over about the fans and totally forgot to mention TDP
Indeed.. no one talks about TDP anymore. That guy over there would be like yeah, you don't need a crazy cooler, its only a 65w TDP CPU.. Yeah when its just sitting there maybe.. but what about when you tell it to do something.. and you kick it in the cores then all of a sudden your in the upper 180s and climbing :laugh:

All this boost trickery, and core density :D
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#12
Vayra86
thegnomeCooler Master quality is fine for most people, obviously not amazing, but good enough for the most people out there.

There's enough cases with imperfections, especially on a real unit that has been handeled. Haven't seen a cooler without small imperfections like you described.
But this is a 100 dollar cooler, not a 45-50 dollar one, which also exist and look just as fine.

Its just not on the level of BeQuiet or Noctua, those are pretty much flawless - and still undercut it on price.
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#13
Caring1
Won't their logo be facing the wrong way on an AM4 set up?
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#14
Mussels
Moderprator
Give it an optional ARGB top cover and all the user wants will have been covered
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#15
Mysteoa
Caring1Won't their logo be facing the wrong way on an AM4 set up?
I don't think so. It will be in the correct orientation.
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#16
AusWolf
The fin stack looks quite small compared to the fans, especially in the 2nd and 4th picture. It's almost like half of the air pushed by the fans blows right through the heatpipes, and never contact the heatsink. I also don't understand the curved top. Wouldn't you want more heatsink surface area to be covered with airflow? Strange design.
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#17
Chrispy_
Vayra86Cooler Master has a lot to learn about quality

That underside there looks plasticky, but maybe its not, either way its not coated too well and placed at a slight angle and one of those clips is touching the center fan while the other is not.

You can also see that top plate isn't oriented at a perfect 90 degree angle on the other pics, and even dents a layer of the heatsink.

Pass

In fairness to CM, most dual tower designs suffer from this problem, even a few D14 Noctuas I've bought. Most obviously the cheap Snowman dual tower, but also Thermalright, Scythe, Deepcool all struggle with perfect alignment on dual-tower coolers.

I think it must be really hard to perfectly bend heatpipes exactly, and then between assembly, shipping and temperature changes the stresses from the cold-set bending slowly work themselves out and result in minute position shifts.

I think having a plastic top plate to act as a spacer/clamp for the ends of the heatpipes is a good idea, it at least keeps the two towers roughly parallel and prevents you from putting skin oils on the exposed top of the heatsink (all of which seem to record fingerprints like nothing else!)
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#18
bonehead123
btarunrIncluded with the cooler are three fans, of which two are SickleFlow 140 mm, and the third SickleFlow 120 mm.
I like the overall design asthetic, but why don't any of the photos show it with all 3 fans attached ?

Also, it appears that there is nothing holding the center fan in place (no clips or brackets that I can see), other than those 2 little tabs from the top cap & it sitting on top of the base plate... whazzuppwitdat ???
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#19
Chrispy_
bonehead123I like the overall design asthetic, but why don't any of the photos show it with all 3 fans attached ?

Also, it appears that there is nothing holding the center fan in place (no clips or brackets that I can see), other than those 2 little tabs from the top cap & it sitting on top of the base plate... whazzuppwitdat ???
There would be no point

A second fan only increases airflow by about 20%, so if you scale linearly the third fan changes it from 120% to 124% which is almost completely pointless.

More likely the three fans gives you flexibility in which two to use, depending on whether you're doing doing push-pull , push-push, or pull-pull. Which of those you'd chose would likely depend on RAM clearance or motherboard VRM heatsink clearance, so perhaps you'd be forced to use the 120 instead of a 140.
AusWolfThe fin stack looks quite small compared to the fans, especially in the 2nd and 4th picture. It's almost like half of the air pushed by the fans blows right through the heatpipes, and never contact the heatsink. I also don't understand the curved top. Wouldn't you want more heatsink surface area to be covered with airflow? Strange design.
The "wasted" fan height where there are no fins is there because of heatpipe bends (that aren't immediately obvious in a perfectly side-on view) What isn't wasted is the full width of the fan. They haven't made oval fans yet (lol) so to get a 140mm wide heatsink you have to use 140mm fans, even if your heatsink's dimensions aren't square and some of that fan will overlap.

On the plus side, the fan airflow from underneath the heatsink's fins isn't wasted at all - they'll be blowing cool air directly at the motherboard VRM heatsink and we know that's valuable.

Edit:
I'm fond of the NH-U14 because it's not too tall (highly compatible) and yet potent because it's 140mm wide. It also suffers from massive overhangs because of it's non-square fin area cross-section. Noctua being Noctua went the extra mile and added half a dozen smaller fins in to try and use the lowest part of the fan sweep, but they're probably not helping much because they only touch the outer two of the six heatpipes, and the middle four are probably taking 95% of the heat from the CPU's IHS anyway.

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#20
Caring1
AusWolfThe fin stack looks quite small compared to the fans, especially in the 2nd and 4th picture. It's almost like half of the air pushed by the fans blows right through the heatpipes, and never contact the heatsink. I also don't understand the curved top. Wouldn't you want more heatsink surface area to be covered with airflow? Strange design.
Perfect for tall ram if used with one centre fan only.
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