Log COOJ SF3 build, new 8.9L sandwich case.

zioNNN

Chassis Packer
Dec 2, 2025
14
18
Hello everyone! This is my first thread in this forum so far, but i've been following several threads over the years.

Recently, chinese case manufacturer COOJ released a new sandwich style case, measuring just 8.9L while still fitting 2.5 slot GPUs, two top 120x15mm slim fans and standard ITX components.

It was an instabuy, they pretty much nailed what I have been craving in an ITX case for years, and on top of that I already loved the MQ5 and MQ6 from them. At $99 it really is a no brainer unless you want to go water. (They will release a WC version very soon).

The build will be reusing all the parts from my previous case, the Zalman M2 Mini. It shared the same sandwich A4-style layout, but it measured around 11 Liters and only had space for a single, minuscule 80mm top fan.

PARTS LIST:
CPU: Intel Core i5 12600KF
CPU Cooler: Thermalright AXP90-X53
MB: Asus ROG B760i ITX Wifi
GPU: INNO3D Twin X2 Nvidia RTX 4070 Super 12GB
RAM: 32Gb Corsair Vengeance DDR5 6400MHZ CL32
SSD: Samsung 980 1TB M.2
PSU: Silverstone SX500-LG 500W SFX-L
+ MODDIY Custom PSU Cables (30cm PCI to 12VHPWR, 20cm CPU EPS, 15cm 24pin)

Here you have some pictures of the build, sadly I didn't take any pic before starting to show the case alone:

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You can't beat these panels. Sturdy, cero wobble, super breathables.

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Added some LED strips:

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Overall, i think they scored a masterpiece with the SF3, I can't think of any competitor for this case in the sub-9L category ITX, the closest I can think of would be the IQUNIX XZ-1 which costs more than double, while the S300 features much worse build quality and design and doesnt offer the dual top 120mm slim fans, and the rest of the Terras, Ncases, Formd T1s are either much more expensive, or bigger, or both.

The price is the cherry on the top, being just $99 for the basic version. (Sure, you may have to add the riser, but in my case I already had one from the Zalman).

My only grip with the SF3 is that the spine/middle tray seems to be held in place by a notch/indent, to me it doesnt feel "secured" or sturdy enough, the motherboard itself has a little wiggle of about 1-2mm if you try move it around.

Everything else, feels increible to me, hats off for COOJ.

Feel free to ask if you have any specific question.
 
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FriarPrior

Minimal Tinkerer
New User
Dec 17, 2025
3
1
Looks great! I bought the silver version and it just arrived. I agree about the spine, but other than that, it feels SUPER sturdy.

How are your thermals and how did you set up your fans?

I am using a ryzen 9700x in mine and I think I need to reseat my axp90-x53; first time using an AMD chip.

Waiting on some shorter cables to arrive which should help my air flow.
 

zioNNN

Chassis Packer
Dec 2, 2025
14
18
Looks great! I bought the silver version and it just arrived. I agree about the spine, but other than that, it feels SUPER sturdy.

How are your thermals and how did you set up your fans?

I am using a ryzen 9700x in mine and I think I need to reseat my axp90-x53; first time using an AMD chip.

Waiting on some shorter cables to arrive which should help my air flow.
I definitely recommend the custom cables, mine came from MODDIY with custom lenghts and couldn't be happier.

My thermals are great, I didnt measure them but even touching the case it never gets hot, just warm, even when playing Battlefield 6 for +2H.

I have two ARCTIC P12 SLIM set as Exhaust on top of the case. They are great however you NEED to put a protective fan grill on the fan above the PSU.

Try reseating that X53, maybe apply new thermal paste or try undervolting the CPU, i didn't need to do it for my 12600kf, it works great by default.
 

FriarPrior

Minimal Tinkerer
New User
Dec 17, 2025
3
1
Great looking build! Been looking at one of the cooj cases for a long while. How was the shipping time?
I ordered my case on November 24th and it arrived December 14th. I'm in North Carolina, USA. Tariffs may have been built into the shipping cost because I was not hit directly with one.
 

FriarPrior

Minimal Tinkerer
New User
Dec 17, 2025
3
1
I definitely recommend the custom cables, mine came from MODDIY with custom lenghts and couldn't be happier.

My thermals are great, I didnt measure them but even touching the case it never gets hot, just warm, even when playing Battlefield 6 for +2H.

I have two ARCTIC P12 SLIM set as Exhaust on top of the case. They are great however you NEED to put a protective fan grill on the fan above the PSU.

Try reseating that X53, maybe apply new thermal paste or try undervolting the CPU, i didn't need to do it for my 12600kf, it works great by default.
I just bought them from cable mod. First time buying custom cables, so hope I didn't just over pay for them haha.

I'm also running the same fans. A lot of open vents on the bottom. Considering throwing some mesh over them to stop dust from coming in and/or putting some small fans down there.

Going to reseat the cooler when the cables arrive so I don't need to pull stuff out twice grin 😁
 
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zioNNN

Chassis Packer
Dec 2, 2025
14
18
Great looking build! Been looking at one of the cooj cases for a long while. How was the shipping time?
Hi, it was ordered on November 17 and it was delivered on Málaga, Spain in Dec 9!

Had to pay 32€ in tariffs, tho.
I just bought them from cable mod. First time buying custom cables, so hope I didn't just over pay for them haha.

I'm also running the same fans. A lot of open vents on the bottom. Considering throwing some mesh over them to stop dust from coming in and/or putting some small fans down there.

Going to reseat the cooler when the cables arrive so I don't need to pull stuff out twice grin 😁
Finally measured temps, both playing BF6 and with 3dMark time spy and others. Both GPU and CPU share similar maximum temps of around 75° when benchmarking, high sixties while gaming.

I think this case doesn't get almost any fresh air from the bottom, like, at all. I guess the openings are there mainly to help switching the PSU on/off, cable management, etc but I don't think either the GPU or CPU is getting any air from there.

And please, get the fan grill for the top fans ASAP if you haven't already, because these fans break easily when they hit the slightest mass 😂
 
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