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The Corsair Obsidian 900D is worth considering only when you will use its unusual capacity. StorageReview’s 2013 specifications describe a super tower with up to 15 internal 3.5-inch drives, five radiator mounting positions, 15 fan locations, support for two power supplies, and ten expansion slots. Those capabilities make it a strong platform for storage servers, multi-GPU-era workstations, and elaborate custom loops, but its 25.6 × 9.9 × 27.2-inch size, 41-pound weight, awkward cable paths in one documented build, and missing PCIe-slot cooling fan make it excessive for a normal desktop.
Because all available reviews are from 2013, they establish the original design rather than today’s used-market price, condition, accessory supply, or warranty. Treat the 900D as a specialist legacy chassis: buy it when the drive bays, radiator room, or internal volume solve a specific problem, and inspect every listing carefully before committing.
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What the Corsair Obsidian 900D is
The Obsidian 900D is a full-tower PC case built around expansion headroom rather than a small footprint. StorageReview’s April 2013 review lists support for ATX, E-ATX, HPTX, Micro ATX, and Mini-ITX motherboards. That range covers ordinary desktop boards as well as unusually large workstation platforms. The chassis also provides ten expansion slots and positions two power supplies at the bottom, features aimed at systems with many add-in cards or unusually high power requirements.
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Its defining trait is empty space that can be assigned to drives, radiators, pumps, reservoirs, or long cabling runs. The trade-off is physical scale. The published dimensions are 25.6 × 9.9 × 27.2 inches and the listed weight is 41 pounds before installing hardware. Measure doorways, desk shelves, rack-adjacent furniture, and the final location before buying; a case this large is difficult to reposition once it contains several drives, coolant, and two PSUs.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
Core specifications at a glance
| Category | StorageReview’s 2013 specification |
|---|---|
| Motherboard support | ATX, E-ATX, HPTX, Micro ATX, Mini-ITX |
| Internal 3.5-inch bays | 9 included; 3 are hot-swap bays |
| Maximum internal 3.5-inch bays | 15 with two separately purchased cages |
| External 5.25-inch bays | 4 |
| Expansion slots | 10 |
| Fan mounting locations | Up to 15 |
| Included fans | Four: three 120 mm front fans and one 140 mm rear exhaust |
| Radiator mounting positions | 5 |
| Power-supply support | Two bottom-mounted power supplies |
| Front I/O | Four USB 2.0, two USB 3.0, and audio ports |
| Published dimensions | 25.6 × 9.9 × 27.2 inches |
| Published weight | 41 pounds |
These are values reproduced in StorageReview’s 2013 review, not fresh measurements. Radiator, fan, and bay combinations still require a clearance check for the exact parts you plan to use.
Pros of the Corsair 900D
Exceptional drive capacity
Nine internal 3.5-inch positions are included, and three of those are hot-swap bays. Adding two optional cages raises the stated capacity to 15 internal 3.5-inch drives. That ceiling is useful for a media archive, backup server, disk-heavy workstation, or a large software-defined-storage experiment where multiple drives matter more than a compact enclosure.
The four external 5.25-inch bays add another layer of flexibility. They can hold optical drives, fan controllers, removable-drive docks, or adapters that convert a 5.25-inch opening into several smaller drive positions. In StorageReview’s own build, four Icy Dock ToughArmor MB996SP-6SB six-in-one adapters were used as a specific example. Their presence in that build does not guarantee that every adapter, backplane, or drive combination will clear the 900D’s rails and neighboring hardware.
Room for multiple large radiators
The case has five specified radiator locations. StorageReview lists a front position up to 360 mm; a top position up to 480 mm with four 120 mm fans or 420 mm with three 140 mm fans; one bottom-side position up to 480 mm or 420 mm; a second bottom-side position up to 280 mm or 240 mm when a power supply is installed; and a rear position for a 120 mm or 140 mm radiator.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
This arrangement can support separate CPU and GPU loops, a large single loop with generous radiator area, or a workstation that needs sustained cooling under long renders and compute loads. “Supports” describes the published mounting locations, not a promise that every radiator thickness, reservoir, pump, drive cage, and PSU can coexist. Check radiator thickness, fan orientation, tubing bends, and motherboard heatsink clearance before choosing parts.
Broad motherboard and expansion support
Support for HPTX and E-ATX sets the 900D apart from cases designed only around ATX. Ten expansion slots leave room for storage controllers, network cards, capture hardware, sound cards, and other add-in boards without immediately running out of positions. The two-PSU layout can also help a build that combines a power-hungry graphics or accelerator platform with many disks, although the electrical load still has to be planned safely and the power supplies must fit the available mounting areas.
Highly configurable interior
StorageReview characterized the interior as highly configurable in its storage-heavy build. The large volume gives builders several ways to distribute drive cages, pumps, reservoirs, and cabling instead of forcing one prescribed layout. That flexibility is especially valuable when a project changes over time: drives can be added, a second loop can be installed, or a workstation board can replace a smaller desktop board without immediately requiring a new chassis.
Useful legacy external connectivity
Four USB 2.0 ports, two USB 3.0 ports, and front audio make the front panel practical for the era in which the case launched. The 5.25-inch bays are also genuinely useful for optical media or removable storage in workflows that still depend on those formats. Buyers should inspect a used unit’s front-panel cables and connectors, because a 2013 case may have experienced years of plugging, unplugging, and transport.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Cons and limitations
Its size and weight affect every stage of ownership
A 41-pound empty chassis is already a two-person handling problem for many people; installed hardware increases that burden substantially. The listed 25.6 × 9.9 × 27.2-inch envelope can exceed the depth or height available under a desk and may not fit through a narrow route to the intended room. Plan where the case will sit, how its side panels will open, and how you will remove it for maintenance before buying.
Cable routing can become awkward
In StorageReview’s documented build, the case did not include power-supply cable extensions for some routes to the 5.25-inch and 3.5-inch bays. As a result, cables crossed the interior in that configuration. This is a documented build observation, not a guaranteed problem with every modular PSU or every drive arrangement, but it is an important planning warning. A PSU with suitably long leads, compatible extensions, and a deliberate cage layout can reduce the issue; adding drives after the system is assembled can make it worse.
No dedicated PCIe-slot cooling fan
StorageReview noted the absence of a PCIe-slot cooling-fan bracket and identified potential hot spots around installed PCIe cards, particularly storage cards and accelerators. The 900D has many fan mounts, so builders can often direct airflow with ordinary fans, but there is no purpose-built fan position attached to the expansion-slot area. Dense card stacks and high sustained workloads deserve a specific airflow plan rather than an assumption that the front and rear fans will be enough.
The maximum drive count depends on optional cages
The headline figure of 15 internal 3.5-inch drives requires two separately purchased cages. The included baseline is nine bays. On a used-market purchase, verify that the cages, trays, screws, and mounting hardware are actually present; a seller’s photograph of the empty chassis does not establish that the expansion parts are included. The exact cage part identity and current availability were not established by the 2013 reviews, so confirm compatibility before paying a premium for a supposedly complete set.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Modern expectations are not part of the original design
The front panel reflects a 2013 case: USB 2.0 and USB 3.0 rather than newer front-panel standards. There is no evidence in the cited reviews of current front-I/O upgrades, integrated fan hubs, addressable lighting controls, or contemporary cable-management accessories. Those omissions do not make the case unusable, but they may require adapters or separate controllers in a modern build.
How many drives and radiators can fit?
Drive planning
- Start with the included capacity. Count on nine internal 3.5-inch bays, including three hot-swap positions, plus four external 5.25-inch bays.
- Confirm the expansion parts. Reaching 15 internal 3.5-inch drives requires two optional cages. Ask for photographs of both cages, their trays, and the mounting screws.
- Reserve cable space. Route SATA data and power before filling every cage. The documented build showed that some power runs may cross the interior without extensions.
- Check simultaneous clearances. A radiator, thick fan, long graphics card, pump, and drive cage can compete for the same volume even when each component is individually listed as compatible.
Radiator planning
Use the five published positions as a starting map: front up to 360 mm; top up to 480 mm with 120 mm fans or 420 mm with 140 mm fans; one bottom side up to 480 mm or 420 mm; the other bottom side up to 280 mm or 240 mm with a PSU installed; and rear 120 or 140 mm. Then compare the radiator’s actual thickness, fan thickness, fittings, and tubing path with the drive cages and power supplies you intend to install.
Who should buy a 900D?
Good matches
- A storage-focused builder who will populate many 3.5-inch bays.
- A custom-liquid-cooling project that genuinely needs several large radiator positions.
- A workstation requiring HPTX or E-ATX support, many expansion cards, or two power supplies.
- A long-lived platform where spare internal volume and future drive expansion are more important than desk space.
Poor matches
- A straightforward gaming PC using one motherboard, one graphics card, and a few SSDs.
- A compact office or living-room setup where footprint, weight, and front-panel age matter.
- A buyer who cannot verify optional cages, trays, front-I/O operation, or return terms.
- Anyone expecting a current case’s connectivity, integrated controls, or easy one-person portability.
Used-market inspection checklist
The 900D’s reviews date from April 2013. StorageReview reported a release-era street price near $350 and a two-year warranty, but those figures describe launch conditions and do not establish present pricing or coverage. Before buying a used unit, inspect:
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- Both optional cages if the seller claims a 15-drive configuration.
- All four 5.25-inch bay covers, rails, and mounting hardware.
- Front USB 2.0, USB 3.0, and audio ports, plus the internal cables that connect them.
- Fan mounts, included fans, dust filters, side-panel hardware, and the side window.
- Evidence of bent chassis rails, corrosion, stripped threads, missing screws, or shipping damage.
- Whether the seller accepts returns if a hot-swap board, front I/O assembly, or cage is defective.
Compare listings on total delivered cost, included accessories, physical condition, and return terms rather than using the historical $350 figure as a current benchmark. No verified current market average, stock level, or warranty status is established by the cited material.
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
How to compare it with another large case
Do not compare super towers by external dimensions alone. Make a checklist that records:
- Usable internal 3.5-inch bays, identifying which are hot-swap and which cages are included.
- Radiator size, thickness, and placement when drives and power supplies are installed simultaneously.
- Motherboard formats and the number of expansion slots.
- One- versus two-PSU support and the length of required power cables.
- PCIe-area airflow and whether a dedicated bracket or nearby fan mount exists.
- Front-I/O standards and the condition of the actual ports on a used unit.
- Footprint, empty weight, lifting access, and the space needed to remove side panels.
- Asking price, missing parts, seller reputation, and return policy for the specific listing.
This method exposes the 900D’s real advantage: it offers more usable expansion paths than a typical full tower. It also makes clear when that capacity is simply unused volume that you will have to store, move, and clean.
Verdict: capacity first, convenience second
The Corsair Obsidian 900D remains compelling as a legacy super tower when a project requires many hard drives, several large radiators, unusually large motherboards, or two power supplies. Its nine included 3.5-inch bays, optional 15-drive ceiling, five radiator positions, 15 fan mounts, and ten expansion slots provide a combination that ordinary cases rarely match.
Its disadvantages are equally concrete: a 41-pound chassis with a very large footprint, cable-routing compromises in a documented build, no dedicated PCIe cooling fan, and expansion parts that may be difficult to verify on the used market. If your build does not need that capacity, a smaller and newer case will be easier to place, wire, cool, and maintain. If it does, evaluate the exact listing and component clearances rather than relying on the model’s reputation or its original launch price.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
