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The internals have all the conveniences we've come to expect from the Obsidian Series. A huge cut-out in the motherboard tray provides unfettered access to CPU back plates, rubber-lined portals facilitate clean cable routing, and rolled edges prevent blood sacrifice. Corsair also puts a permanent stud in the middle of the motherboard tray, making it easy to center and install boards, especially with the case standing vertically.

Fresh from the factory, the drive cage sits in the lower front quadrant of the chassis. However, the cage can also hang from the bottom of the 5.25" bays. Click the button below the image to see the alternate position.

With the cage in its original position, the 450D can handle expansion cards up to 16.9" long—pretty much anything, in other words. Raising the cage limits clearance to 11.5", which is still enough space for a GeForce GTX 780 or Radeon R9 290X. In this configuration, the lower mounting bracket can be removed to make room for a 240-mm radiator on the bottom panel.

With the cage in its original position, the bottom panel has room for a single 120- or 140-mm fan—provided the power supply doesn't get in the way, that is. The 450D's bottom-mounted PSU emplacement supports ATX units of pretty much any length, but there's only 5.8" of clearance between the left side of the PSU area and the edge of the first 140-mm fan mount.

The power supply sits on four raised rubber feet that should help to dampen vibration. Standard screws anchor the PSU to the rear panel, and sadly, they're not of the thumb-friendly variety.

More cooling mounts can be found in the top panel, which has three fan emplacements and support for radiators up to 360 mm long. The pre-installed fans at the front and back can be swapped for radiators, too. The rear exhaust mount will take a 120-mm unit, and the front panel has enough room for a 280-mm one.

Surprisingly, only the 120-mm fan mounts in the top panel are lined with rubber grommets. All the other brackets are devoid of vibration-dampening materials, including the ones occupied by the stock spinners.

The motherboard tray is the only sizable surface that isn't drilled to host fans and radiators. Corsair does include four rubber-lined cable-routing holes, however, and it leaves 0.8" of clearance behind the tray for cabling. The company also includes a couple of cable tie-down points at the back of the tray. I would have liked more of those, since I've been known to go a little overboard with zip ties.

Hiding cables behind the tray requires a little more finesse than usual, because a large chunk of the available area is monopolized by a pair of 2.5" drive bays. These bays sit low on the tray, under the motherboard's expansion slots.

Similar tool-free bays are deployed in different ways across the Obsidian Series lineup. I believe this is the first time we've seen them hugging the bottom of the motherboard tray. In a moment, we'll examine how that affects SSD temperatures. First, I should probably highlight the 450D's other tool-free amenities.

Three sleds populate the main drive cage. Each one snaps onto 3.5" drives without tools, but installing 2.5" drives requires a screwdriver. Sticking thumbscrews on the sleds wouldn't be practical, so that's fine. However, I would have liked to see the main drive cage fastened down with thumbscrews rather than regular Philips heads. As it is, the cage takes a bit of extra work to reposition.

The latching mechanism for the 5.25" bays is entirely tool-free. It holds optical drives reasonably tightly, though I still managed to push one loose while plugging in its power cable. Fortunately, optical drives can still be screwed down completely.

We've covered most of the following specifications already, but here's the full list for easy comparison with our other enclosure reviews.

Corsair Obsidian Series 450D
Dimensions (H x W x D) 19.5" x 8.3" x 19.6"
Supported motherboards Mini-ITX, microATX, ATX
Expansion slots 7
3.5"/2.5" drive bays 3
2.5" drive bays 2
5.25" drive bays 2
Fan mounts 8
Included Fans 2x 140-mm (Corsair AF140L) front intake
1x 120-mm (Corsair AF120L) rear exhaust
Front panel I/O 2x USB 3.0
Max. graphics card length 16.9" or 11.5", depending on drive bay config
Max. CPU cooler height 6.5"
Gap behind motherboard 0.8"

At this point, you're probably more interested in what it's like to build a system inside the 450D. So, let's find out.