Best case for RTX 4090 in 2024: ATX, RGB and watercooling

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We’re here to help you find the best case for RTX 4090.

With the RTX 4090, the chances are that your PC case might not be big enough to house your new graphics card due to its size. Choosing the right PC case is important when it comes to the RTX 4090 since it demands a large case for effective cooling. In this article, you’ll find our picks of the best cases for RTX 4090, plus some guidance on how best to choose one.

Nvidia’s flagship GPU’s top tier specs mean it will eat up over 450 watts at full capacity mainly because of its monstrous VRAM size and high TDP. Brands like Corsair and ROG Strix are popular for heat dissipation. We’ve also chosen cases with a mesh or glass which are ideal for cooling, whilst factoring in the amount of space you’ll need for fans and radiators. Aim to leave about 350mm of clearance in your case.

Best RTX 4090 cases

Below we’ve prioritised standard ATX cases for the 4090. Make sure you’ve decided on the best PSU for the RTX 4090 too before committing to a case.

1. The best case for most builds – NZXT H7 Flow RGB PC Gaming Case

NZXT H7 Flow RGB PC Gaming Case

Case Size



22.44 x 22.44 x 12.2 inches


2 x USB 3.0, headphone jack

Tempered Glass


Up to a 360mm radiator in the top and front panels, 3 x 140mm fans in the front, and a 140mm fan in the rear.

  • Very good value for money
  • Supports E-ATX, ATX, MicroATX and Mini-ATX motheboards
  • Basic design
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This case wins for all-round functionality

The combination of value for money, spacious interior and simple design makes this case king.

This case has been well received since it first came on the market. It features a perforated front and top panel and comes with three pre-installed 140mm RGB Core fans and one F120Q Quiet AirFlow fan. It has support for vertical GPU mounting too, which is great for those who want to showcase their RTX 4090.

The tooless entry feature makes it an easy setup, especially for those who have less experience building PCs. Meanwhile, the cable management and tempered glass panel keep things looking nice and tidy.

2. Best PC case for airflow – Corsair 4000D Airflow

Corsair 4000D Airflow

Case Size

Full Tower


471 x 285 x 513 mm


4 x USB 3.0, 1 x USB 3.1 type-C, 1 x HD audio

Tempered Glass

Yes – left and front panels


3 x 120 mm (side), 1 x 120mm (rear), 3 x 120 mm (base), 3 x 120mm (top)

  • Spacious interior
  • Large mesh top panel
  • Tool-less design
  • Difficult to remove side panels
  • Only supports 240mm or 280mm radiator

This case is from the O11 Dynamic series which specialises in water cooling compatibility whilst keeping the design simple and elegant, thanks to German engineering by DER8AUR. Have peace of mind with upgraded cooling support which works even when mounting dual GPU or vertical GPU.

3. Best RGB case for RTX 4090 – Lian Li O11 Dynamic EVO

Lian Li O11 Dynamic EVO

Case Size

Mid Tower


456 x 285 x 459 mm


2 x USB 3.0, 1 x USB 3.1 type-C, 1 x HD audio/mic, LED color and mode button, reset button, power button

Tempered Glass

tinted tempered glass & fine black mesh for airflow and dust filtering


custom water cooling, accommodating up to 3 x 360mm and up to 10 fans

  • Modular design allows for custom layout
  • Good for custom water cooling builds
  • Good clearance
  • Expensive
  • Lacks sound insulation

This is a fantastic reversible PC case for the 4090, though is best suited to high end builds. It doesn’t come with fans which is why things can get expensive. And with that being said, you’ll probably need around five to seven fans to get adequate airflow for your GPU. If you have the budget, then you won’t be disappointed. You’ll have plenty of clearance too.

The case features 4 USB 3.0 ports and 1 USB 3.1 port. The main i/o has a power button and a reset switch too which is handy if your game randomly freezes. The cable management here is decent, with plenty of space for both large and small cables around the back.

4. Best budget friendly case for RTX 4090 – Lian Li O11D Mini

Lian Li O11D Mini

Case Size

Mini Tower


420mm x 269.5mm x 380mm


USB 3.1 Gen 2 Type-C, 2 x USB 3.0, 1 x mic and headphone jack

Tempered Glass

Yes – top and left


Space for up to 8 120mm fans or 6 140mm fans

  • Attractive case
  • Great RGB lighting
  • Lots of room for cooling
  • Decently priced
  • Tricky setup that requires careful planning

This case is great value for money. The build process is relatively traight forward and the end result is magnificent. The Mini is the most customizable case compared to the other O11 cases, so if you like to experiment with different builds, this will be a good choice.

Its size is modest, and the white and RGB lighting looks fantastic. The interior is highly modular, and there’s plenty of room for everything to fit inside.

How big is the Nvidia GeForce RTX 4090?

The Founders Edition has a card length of 12 inches, and most custom cards are expected to be much bigger. However, the smallest sizes we’ve seen has been the GIGABYTE Aorus RTX 4090 Xtreme Waterforce which has a card length of 9.4 inches.

Are third party RTX 4090 different sizes?

Yes – you’ll find that models like the ROG Strix is much larger at 358mm length and quad slot thickness compared to the smaller Gainward RTX 4090 Phantom which is just 329mm in comparison. Make sure you check the dimensions of your model before committing to a case.

Features to look out for in RTX 4090 PC cases

If you’ve got your hands on the RTX 4090, choosing the right PC case is the next thing on your list to make sure your new graphics card can operate at its full capacity. Below you’ll find a short explanation on the specific features you should consider, including size, airflow and ports.

GPU Compatibility

There are two factors which will affect what size PC case you need:

First is the actual size of your GPU. For obvious reasons, you need to make sure your GPU physically fits inside the case whilst factoring in what else is inside the case. You might have other hardware like AIOs, water-cooling tubes and drive cages which all take up space, not to mention you might want to leave room for some extra fans. Our advice for the RTX 4090 is that bigger is probably better here.

Second is the thickness of the GPU, which is measured in millimetres or slots. The RTX 4090 has triple slots which has until now been fairly rare since triple slots are generally reserved for top-tier graphics cards. You basically need to make sure there’s enough room at the back of your case and on your motherboard.


Make sure your case fully supports airflow with a glass or mesh case, plus plenty of room for fans. An easy rule is the more fans the better when it comes to the 4090, though be weary with the amount of power it’ll be eating up.


You won’t want any limitations from your GPU case, especially if you’ve got the RTX 4090. Coming with 1 x HDMI and 3 x DisplayPort, it’s worth knowing that these connectors are at the top of the card, but will be on the side of your case when you install it. Bear in mind you might need longer cables to make sure they can easily be tucked out the way.

About the Author

Romilly Cotta

Romilly is a tech writer for Videogamer. When she's not covering the latest tech and hardware releases, you'll find her taking care of her Nintendogs.