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The 5 Largest PC Cases for High-End Builds in 2023

Largest PC Case Cover

Update: Our top picks remain the same after a mid-2024 review, but we’ve included a couple of decent alternatives where relevant.

After 100s of PC case reviews, I’ve been through many different shapes and sizes of chassis on What in Tech.

Amongst them, some extra-large towers have really stood out for those looking at creating something particularly powerful.

If that sounds like you, today’s feature is about ranking the largest PC cases I recommend for top-end gaming/production builds. These are cases that I recommend for their utility across the board, not just the largest in dimension (otherwise I’d recommend you an XXL cardboard box!).


Largest PC Case Top Pick

Corsair Obsidian 1000D

Our Rating: 9.75/10


Largest PC Case for Silent Builds

Deep Silence 6

Our Rating: 9/10


Largest Cheap Case

Corsair Graphite 780T

Our Rating: 9/10


Unique Pick

Cougar Conquer 2

Our Rating: 9.25/10


Honorable Mention

Cooler Master Cosmos C700M

Our Rating: 8.5/10

Largest PC Case (Best Pick): Corsair Obsidian Series 1000D

Now, there are a couple of chassis picks further below that are a tad larger in terms of external dimensions. But in terms of internal space and capability? The 1000D is comfortably my top pick for super tower gaming or high-scale production use.

Featured multiple times on WIT, the 1000D is an absolute powerhouse. Its build quality has one of the slickest and sturdiest combinations of thick steel, aluminum, and tempered glass I’ve ever seen. It’s a case that is not done justice by stock photos. Only once powered on with beautiful internal components on display it’s stunning to behold. I’ve had the pleasure of reviewing many 1000D builds and even the most basic look incredible.

The crowning feature of the 1000D (aside from its excellent cooling, which we’ll discuss later) is that it’s a dual-system PC case. This means it supports an independent Mini ITX motherboard/PC alongside your main setup (in other words, 2 PCs inside the same chassis!). There’s a lot of potential utility for premium work/gaming builders with this, and great for content-focused streamers who can they enjoy separate dedicated gaming and streaming setups.

Inside this super tower is room for:

  • 10 x expansion slots
  • GPU length clearance up to 400mm (enough for any mainstream card with room to spare for airflow, one of the best PC cases for RTX 3090 builds)
  • A great front I/O panel, with 2 x USB 3.1 gen-2 type C USB ports amongst the classic inputs (all beautifully backlit with RGB)
  • Accessible but nicely hidden bays for up to 5 x 3.5″ & 6 x 3.5″ drives
  • Up to 18 x 120mm fans (stock configuration up to 10 x 120mm + 3 x 140mm)
  • Or up to 4 x 480mm + 1 x 240mm radiators (stock configuration up to 2 x 480mm, 1 x 420mm + 1 x 240mm)
  • Triple-chamber layout to maximize cable management and airflow of both the main and secondary systems (as well as room to hide “uglier” components like PSUs)
  • Included smart fan controller if you want to add RGB fans to your build
Corsair Obsidian 1000D

Source: six60six

These are some of the most insane specs I’ve ever seen for a chassis. The 1000D isn’t just extra-large but adds some really unique features with its size.

Between the triple-chamber design, dual system capability, and fantastic room for hardware/cooling, what I like most about the 1000D is that it isn’t just large for the sake of it. It’s clearly been meticulously designed to make use of its huge dimensions for amazing capability.

The only case I’ve seen come close to its cooling capacity is the Thermaltake Core P8. But that case does not have the same large space for ventilation and airflow. The 1000D is the best PC case for airflow, cooling (fan or water cooling) I’ve ever seen. I’ve been super impressed by the thermal benchmarks I’ve seen from it, even in particularly demanding builds.

Whether you are intending to intensely overclock a gaming build or keep a demanding production setup performing optimally, you really can’t get better than this.

2024 update: It’s had 3.5 years at the top of the list and I still haven’t seen any other case come close to toppling the 1000D. Its massive size, fantastic cooling capability and beautiful build mean its hard to imagine there being a better competition in the categroy any time soon.

Our Rating: 9.75/10

Largest PC Case for Silent Builds (Best HTPC Case): Nanoxia Deep Silence 6

Our next choice is for those builders who have a specific requirement for an extra quiet super tower. The Deep Silence 6, while not reaching all of the highs of the 1000D, has some very impressive features (particularly in storage) and would make a great music production PC case, server chassis, or some other high-end work that requires optimum noise-reduction.

The Deep Silence 6’s build quality, as you would expect for a premium silence-focussed chassis, is very thick steel (one of the most sturdy/durable cases I’ve come across). Surrounding a large portion of the exterior is also some industrial sound-proofing material to maximize noise isolation. It’s one of the quietest PC cases available today, impressive considering its size. Aesthetically, everything about the case looks “professional”, like it’s designed to really make an impression for high-budget production.

This super tower PC case has room for:

  • HPTX / XL-ATX Motherboard support (one of the very few cases to have it, but you can still reap the value of the case with ATX or E-ATX)
  • 10 x expansion slots
  • GPU length clearance of up to 400mm (perfect for all mainstream cards)
  • 4 x 5.25″ external, 2 x 3.5″ external (with adapter), 10 x 2.5″/3.5″ internal (up to 13 with adapter) & 2.5″ internal drive bays
  • Up to 8 x 140mm + 1 x 120mm fans with 5 140mm quiet fans pre-installed + front panel controller to allow you to balance performance and noise depending on the situation
  • Up to 1 x 360mm, 1 x 280mm & 1 x 140mm radiators (that can be combined with some of the fan setup).

The Deep Silence 6 has some simply fantastic specs across storage in particular. Combined with its silent design, we rank this as one of the best server PC cases or something for media/HTPC builders available today. Not only is the drive bay allowance incredible out of the box, but the fact that you can add to it further with adapters is a bonus (not to mention, if you’re like most people and don’t need 4 x 5.25″ drive bays, you can use them to massively expand your storage).

There is also plenty of cooling capability, and we appreciate the 5 included 140mm fans that will be enough for a majority of builds in here. If you are looking for a gaming build, the 1000D is probably the better choice with its additional cooling and triple-chamber layout. However the Deep Silence 6 could still aptly run a powerful gaming machine if achieving a low decibel level means more to you.

Simply put, the Deep Silence 6 is an incredible chassis and easily the best quiet super tower available today.

2024 update: I’ve kept the DS6 as the top quiet choice as it does a fantastic job and is the largest in the picks designed for low volume. With that said, I also really appreciate the Fractal 7 XL for premium quiet builds. It’s not as large, but I think if your build would fit inside, it’s the better choice.

Our Rating: 9/10

Largest Budget PC Case: Corsair Graphite 780T

While “budget” and “largest” don’t go very well together, the 780T, despite still being a fair bit pricier than the average budget chassis, is notably lower than every other extra-large case close to its size while still being decently featured in its own right.

The case design is striking. With thick, curved steel engulfing much of the case’s exterior, the 780T feels built to last and has a rather unique aesthetic. One design feature we really appreciate is the latched handles on most of the case’s panels, with it being one of the easiest chassis we’ve seen to quickly access/re-close once finished.

This full tower has room for:

  • 9 x expansion slots
  • Graphics cards up to 355mm in length (more than enough for most, but double-check dimensions if you’re buying a premium GPU)
  • 2 x 5.25″, 2 x 2.5″ & 6 x 3.5 /2.5″ combo drive bays
  • Deep and well-laid-out cable management facilities
  • Up to 10 x 120mm fans with 3 x 140mm fans included (2 with red LEDs)
  • Alternatively, combine a smaller fan setup with up to 2 x 360mm radiators

With these specs, it’s clear that the 780T does a fantastic job of retaining lots of internal capability despite costing less than half our two top picks.

With plenty of room for high-end GPUs and cooling, this would make a great choice if you’re after one of the largest ATX cases for gaming (plenty of overclocking potential here).

Simply put, if you want an extra-large PC case that is only a hair above the usual mid-range price bracket, the 780T is the ideal choice.

Our Rating: 9/10

Largest PC Case with Unique Design: Cougar Conquer 2

I think you’ll agree that the chassis image speaks for itself!

If you want your extra-large PC case to also turn the heads of any guest that comes to your house, this is the ideal choice. The Conquer 2 has a wonderfully unique design. 

Covered in thick metal panels and 4 tempered glass windows, the Conquer 2 has one of the nicest build qualities I’ve seen from any chassis. The aesthetic is made extra unique by the ARGB lighting on the front side of the case (including the pre-installed ARGB fan at the bottom). This is a strong example of a case that cannot be done justice by stock photos. I love how this case looks in person. The quality of the material really shows when you see a full build powered-on and running as part of a nice setup.

Inside this large ATX full tower is room for:

  • 8 expansion slots & 2 for vertical GPU installs
  • VGA lengths up to 400mm (more than enough as a PC case for RTX 3080, 3070, or 3090).
  • 2 x 2.5″ / 3.5″ & 2 x 2.5″ drive bays
  • Up to 6 120mm fans
  • Alternatively up to 1 x 240mm & 1 x 360mm radiators

You may find some of the above specs underwhelming compared to our other top choices. There is a key difference though: the Conquer 2 is an open-air PC case that is designed to be presentable at all angles. This means that the cooling solutions will be more than enough for even a powerful gaming setup due to the amount of open airflow and ventilation the case gets.

I am a little disappointed in the drive bay availability. They are notably lower as they are all designed to be hidden to maximize the clean aesthetic the Conquer is going for. Let’s be real though; unless you’re building a server, HTPC, or something with very high storage requirements, the drive bays enough will be plenty, especially for gaming.

It looks like the Conquer 2 would be difficult to build in, but Cougar included a fantastic feature: a detachable sub-chassis. Essentially you can remove a tray from the middle of the case where your motherboard & main components will sit. This doesn’t just make building smooth, but I found it more pleasant to build in than a lot of traditional cases!

You are, of course, paying a premium for the design of the Conquer 2, but it is a true marvel to behold. If you want to build a powerhouse in not just one of the largest gaming full towers available, but one of the most unique, the Conquer 2 is for you.

Our Rating: 9.25/10