The 5 Largest PC Cases for High-End Builds in 2021

Kaelum Ross

Nov 17, 2020

After 100s of PC case reviews, we’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 will take you through the largest PC cases we recommend for top-end gaming/production builds.

Top Picks

Largest PC Case (Best Pick): Corsair Obsidian Series 1000D
Largest PC Case for Silent Builds: Deep Silence 6
Largest Budget PC Case: Corsair Obsidian Series 1000D
Largest PC Case with Unique Design: Cougar Conquer 2
Largest Full Tower (Alternative Pick): Cooler Master Cosmos C700M

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 our pick as the best super tower case for gaming or high-scale production use today.

Featured previously on What in Tech, the 1000D is an absolute powerhouse. Starting with the build quality, it has one of the slickest and sturdiest combinations of thick steel, aluminum, and tempered glass we’ve ever seen. It’s a case that is not done justice by stock photos. Only once powered-on with beautiful internal components shining through will you see just how fantastic this extra-large chassis can look.

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-based PC working alongside your main ATX or EATX motherboard 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 it also makes the 1000D the best streaming PC case available for high-end content producers.

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

As you can see, with some of the most insane specs we’ve ever seen on a PC case, 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, you don’t just feel like you’re getting the largest PC case, but one that has been meticulously designed to make use of that space.

The only case we’ve seen come close to its cooling capacity is the fantastic 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) we’ve ever seen.

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.

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 PC case. 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 high-end silent PC case, is very thick steel (one of the most sturdy/durable cases we’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 super tower, 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 silent super tower available today.

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 extra-large 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.

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 is a crazy PC case with a wonderfully unique design.

Covered in thick metal panels and 4 tempered glass windows, the Conquer 2 has one of the nicest build qualities we’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. With some RGB or top-end components alongside it, the Conquer 2 looks incredibly striking.

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 clearly 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. Additionally, the drive bays are a tad lower because they are all designed to be hidden (but let’s be real: 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 possibly easier than many other more traditional PC cases!

You are, of course, paying a premium for the incredible 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.

Largest Full Tower (Alternative Pick): Cooler Master Cosmos C700M

Our last pick is an honorable mention if you want an overall alternative to the 1000D (in the same price range). The C700M is another supersize PC case designed for high-end builds.

With a beautiful, thick aluminium//steel/dual-curved tempered glass hybrid case design accompanied by some tastefully subtle ARGB lighting, the C700M is beautiful and another example of a case not done justice by stock photos. We appreciate also the handles neatly added to the top of the case; don’t underestimate how hard it can be to carry an extra-large chassis!

The specs lean the C700M towards being more of a gaming full tower, with:

8 x expansion slots
GPU lengths up to 490mm (320mm with HDD bracket, still enough for most cards)
1 x 5.25″, 4 x 3.5″ / 2.5″ combo & 4 x 2.5″ drive bays
Up to 9 x 140mm fans (with 3 pre-installed)
Up to 2 x 420mm, 1 x 240mm & 1 x 140mm (420mm reduce to 360mm if 5.25″ drive cage is installed)

There are some decent specs available on the C700M, certainly enough for a powerful gaming/production/video editing PC case. But you can probably see why, for the same price range, we rank the 1000D above it; with our top pick’s super cooling and storage availability. We also consider it to have a slightly better ventilation design (with its triple chambers & airflow setup) plus the nice option to set up a dual system.

None of this is to say the C700M is a bad case however, it has a lot going for it and we included it for a reason, if you’re looking for one of the largest PC cases and this Cooler Master offering fits in with your personal aesthetic, it’s a great choice for a very high-end build.