CORSAIR Carbide Series 678C Low Noise Tempered Glass Case Review

A new take on the low-noise mid-tower

CORSAIR's Carbide Series has a new low-noise option in the 678C, a mid-tower enclosure with internal sound damping panels and full tempered glass side panel. Convenience features include the hinge and magnetic closure of the glass side panel, along with a hinged front panel that opens to reveal the front fans and corresponding screen filter - and a rare 5.25-inch bay which allows for installation of an optical drive for those of us who still use discs (this author included).

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So does the Carbide 678C provide a compelling mix of features in the premium segment of the case market, and provide real competition for the Define R6 from Fractal Design against which it will be inevitably compared? Let's find out.

Features for the Carbide Series 678C from CORSAIR:

  • Sophisticated Style: Defined by clean lines and smooth steel construction, with a crystal-clear tempered glass side panel to show off your system’s components.
  • Extensive Sound Damping: Sound damping material on the side, front and roof panels ensure quiet operation – or swap in the included dust filter on the roof when performance is your top priority.
  • A Multitude of Cooling Options: Includes space for 360mm push/pull radiators in the front and roof, 280/240mm radiators on the floor, and 140/120mm radiators in the rear.
  • Massive Cooling Potential: Powerful and efficient airflow, with room to install up to 9x 120mm or 7x 140mm fans for massive cooling potential.
  • Take Command of Your Cooling: A PWM fan controller regulates three included SP140 PWM fans and up to three more. Reduce fan speed when you want keep your system quiet, or increase when you want to push its performance.
  • High-Speed USB 3.1 Gen-2 Type-C Port: Front panel connector puts future-proof connectivity within easy reach.
  • Expand Your Storage Options: Install up to 6x 3.5in and 3x 2.5in drives. A versatile HDD/ODD design includes six modular trays that can be moved to eight mounting locations to give you the exact layout you want.
  • Easy Accessibility: Both the front panel and tempered glass side panel are hinged for tool-free easy access.

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The insulated front door opens to provide access to the fan filter and 5.25-inch drive bay

Continue reading our review of the CORSAIR Carbide Series 678C low-noise case


  • Material: Steel, Tempered Glass
  • Form Factor: Mid-Tower
  • Expansion Slots: 7+2 vertical
  • Drive Bays: 6x 3.5-inch, 3x 2.5-inch
  • Radiator Compatibility: 120mm, 140mm, 240mm, 280mm, 360mm, 420mm
    • Compatible Corsair Liquid Coolers: H55, H60, H75, H80i, H90, H100i, H105, H110i, H115i, H150i
  • Component Clearance:
    • Maximum GPU Length 370 mm
    • Maximum PSU Length 225 mm
    • Maximum CPU Cooler Height 170 mm
  • Case Dimensions: 549 x 239 x 497 mm (21.61 x 9.41 x 19.57 inches)
  • Weight: 13.056 kg (28.784 lbs)
  • Warranty: Two years

Launch price and availability: $199.99,

Case Exterior

There's nothing flashy here, as CORSAIR has gone with a minimalist approach totally devoid of RGBs (just one blue light on the upper right corner when the case is powered on).

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The front panel has a brushed finish to the plastic, hiding the optical bay an front fan intake. Both this and the side panels are hinged and close with magnets, making access to the interior as convenient as possible.

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The side panel has a fairly dark tint to it, but component lighting - if you go down the road of motherboard/memory/cooler/graphics card RGB - will still be visible, if a little muted.

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Case I/O is up on the top right, and includes a basic compliment of USB and 3.5 mm audio.

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The top of the case can provide further noise reduction via an included insulated panel, or better airflow with its magnetically attached mesh panel.

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Around back we see the standard ATX mid-tower layout with the additional 2x expansion slots for a vertical GPU installation alongside.

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The bottom of the case offers a full screen filter, and this conveniently slides out from the front for easy access.

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And finally a look at the included hardware, and the screws are individually bagged which is always appreciated.

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Interior and Build Notes

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The component chamber offers grommeted cable openings to the right of the motherboard tray, with additional open routing spaces above and below the motherboard.

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At the rear of the case interior is one of the three pre-installed 140 mm (SP140 PWM) fans.

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Looking to the right we can see four of the included hard drive trays which protrude into the component chamber (the empty space for another pair allows for the installation of longer graphics cards). Another of the included SP140 PWM fans is installed on the front intake, which can be accessed from the front with the fan filter removed.

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The bottom of the case interior offers another grommeted cable opening, and is well ventilated.

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Around back we ee a left side dominated by 3.5-inch hard drive bays (8 bays total, 6 trays included), and three of Corsair's spring-loaded 2.5-inch bays are positioned below the motherboard cutout.

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Above the cutout you may notice the PWM fan hub, which connects to an available motherboard fan header to allow for customizing the speed of up to six fans.

The rear panel offers noise insulation to match the material found inside the front panel and optional top panel.

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As to the build, one of the first things I did was check the fit of an optical drive:

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Drives of more recent (compact) vintage fit without protruding from the 5.25-inch cage, and while longer drives fit as well they can obstruct liquid coolers at the top of the case.

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A 280 mm liquid cooler (CORSAIR H115i) fits up on the top of the case with just enough clearance around it, though installation was a little tight with the optical bay in place.

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This optical bay can be removed, which would allow for installation of up to 360 mm radiators with supporting fan mounts on the top of the case.

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Looking next to storage, the included hard drive trays come out with three thumbscrews apiece, and the drive mounts are insulated with soft rubber to reduce vibration.

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As mentioned there are a total of 8 openings for 3.5-inch hard drives, with 6 of the trays included. Of these the lowest two are hidden behind the PSU shroud.

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It's worth noting that no bay covers are included should you wish to remove any of the upper hard drive mounts within the component chamber.

SSDs installation is completely tool-free, with a spring-loaded mount for up to three drives (these release by pressing a tab to the top of each slot).

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The rest of the build process is as straightforward is possible, with no clearance issues or other problems to report.

Completed Build

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The finished build with an ATX motherboard and standard-length graphics card fits neatly into left side of the case, which would allow for up to up to six hard drives to be installed on the other side.

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Around back space for cable organization is at a premium, and it will require some additional care to rout things around drive bays and get the back cover into place. A little more room back here would have been welcome, considering the thickness of the insulation on the rear panel. Still, I did get the panel on without any bulging and the finished build looked great.

Temps and Noise

PC Perspective Enclosure Test Platform
Processor Intel Core i7-8700K
Graphics Card NVIDIA GeForce RTX 2080 Founders Edition
Storage CORSAIR Neutron XTi 480GB SSD
Power Supply CORSAIR RM1000x 1000W
CPU Cooler Cooler Master Hyper 212 RGB Black Edition
Operating System Windows 10 64-bit

Performance numbers were very good, and cooling was actually a lot better than expected even with the solid top panel in place (this is how we tested it). Air is drawn in from underside of the solid front panel and also from the bottom of the case, and here the vented shroud beneath the motherboard tray helps promote airflow quite a bit.

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At first blush it appears that there just isn't sufficient airflow for this design to work, but it does. Don't be thrown by the lack of visible front intake as the cooling performance is just fine - and again, that's with the solid top panel in place.

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Noise levels were also quite low, staying south of 35 dBA with loads closer to 33 dBA. The tested air cooler - a Cooler Master Hyper 212 RGB Black Edition we recently reviewed - was silenced very effectively as it reached nearly 40 dBA on the open test bench and was barely registering over 33 dBA inside the case. Likewise the tested RTX 2080 barely registered over the nominal ~32.6 dBA idle noise from the three included fans, and in general the noise levels are excellent.


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The Carbide Series 678C is a quiet mid-tower case with a good build quality, a sleek and understated look, and good performance. Its $199 launch price does place it $50 above the similar-looking Fractal Design Define R6, but in fairness to the Carbide 678C there are some significant differences with CORSAIR's design here which are improvements, such as the hinged tempered glass panel, more robust 3.5-inch drive trays, and the three spring loaded SSD mounts. Do these differences make up the disparity in pricing? To some extent, yes, but $199 does feel high and a lower price point would make this case much easier to recommend.

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Video News

March 22, 2019 | 04:25 PM - Posted by Anonymously Anonymous (not verified)

Maybe I missed it, but how does the top radiator support work with tall RAM sticks?

I can see the pictures of a top mounted radiator, but can't tell if there is RAM installed, or how close the radiator might be to the RAM slots

That's something that concerns me, if and when I ever get another pc case, it has to have good top mounted support for the thickness of a fan/radiator/fan sandwhich or extra thick radiator, and tall RAM.

so in my current setup, I have a corsair h80i v2 on my cpu, setup in push/pull, and I have an evga hybrid card. I'd like to put both rads in push/pull but the motherboard placement in my case has it up near the top fan mount, so can only run the evga hybrid radiator with a single fan.

Might be somethign worth noting in your case reviews.

March 22, 2019 | 04:41 PM - Posted by Sebastian Peak

You can just see the top of the two installed DIMMs in the photo of the installed H115i cooler (black heatsinks, beneath the left side of the right cooler fan above).

There's about an inch of clearance between the top of the RAM heatsinks and the bottom of the cooler's fans, so tall modules won't be an issue.

March 23, 2019 | 09:20 PM - Posted by Anonymousnameisalreadyused (not verified)

Ok wasnt sure about that pic, thanks for clarifing.

So, hypothetical situation, what about when someone has that AIO 240 mm that you have shown, and also an evga hybrid gfx card that also has a 120mm rad. What would be best way to install those two rads in this computer case?

Another question, what about putting that 240mm AIO in push/pull config, is there clearance for tall ram?

March 27, 2019 | 01:52 PM - Posted by Donkey (not verified)

Assuming the fans are 25mm thick and there is an inch of clearance, you might be in trouble. Then it's irrelevant about the height of the RAM. You should be more concerned about the location of the RAM slots on your chosen motherboard. Also, is a push/pull config even needed on a 240mm CPU rad?

As for the 120mm radiator you can have it exhausting out the rear.

I can see that Corsair put some good things in this case, such as the hinged glass panel, the PWM fan hub and the options for the top panel. But there are some strange decisions too like the front hard drive bays and that price. The reviewer did a good job but this case would not be high on my list at that price point. I'd look at the Phanteks Evolv X or the CoolerMaster H500 Mesh instead.

Note that some reviewers have had a better experience using the top radiator as an intake.

March 22, 2019 | 07:29 PM - Posted by Skree (not verified)

Dear Sebastian. Thankyou for checking the fit of an optical drive in this case. Most important feature now that manufacturers seem to have got the hang of dust filters

March 23, 2019 | 12:33 PM - Posted by Sebastian Peak

I'm just happy to be able to test optical drive fit. So few cases offer that 5.25 bay anymore...

March 25, 2019 | 06:22 AM - Posted by Mdanon (not verified)

Wow thanks, Good Case

March 25, 2019 | 08:20 AM - Posted by BV (not verified)

I noticed there is not much space for cables on the backside of the case. I'd like to know if you could easily slide the sidepanel on the case to close it, or if you have to force it on.

March 25, 2019 | 09:00 AM - Posted by Sebastian Peak

After spending some time organizing the cables into the available space and tying things down the back panel does slide on without much trouble. It isn't smooth since there is some friction with the material on the panel as it interacts with the cables, but there was just enough room. I mentioned this lack of space behind the motherboard tray as an area I'd like to see improved, but I have certainly built systems in cases with less room. The panel doesn't bulge outward when closed if you're careful, at least. 

March 25, 2019 | 09:36 AM - Posted by BV (not verified)

Alright, Thanks for the answer and a nice review. :)

April 5, 2019 | 03:30 PM - Posted by GrayWolfShaman

This is a great review, very detailed notes, excellent pictures and attention to detail. I personally like the case design and am very glad that the solid door provides enough airflow, is magnetic AND reveals a 5.25" drive bay behind it. I like the magnetic side panel, the removable dust filters and the good number of hard drive cages. The SSD click to load compartments on the back of the MB tray are a great use of space. Very nice to see the well-ventilated PSU compartment also. This is on my short list now and I was unaware of it before this review. Thank you!

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