Corsair Obsidian 900D Review: Making Room For High-End Gear

The Obsidian 900D's Stock Cooling System

You'll find a removable cover on top of the case with mounting holes and a fan grill pattern to accommodate as many as four 120 mm fans. You can also install a radiator, so long as it doesn't exceed 480 mm (18.9”).

Remember when I mentioned the incomplete installation instructions? Well, here's where you need to be careful. The correct way to remove this cover is moving it from left to right, ignoring significant friction that might suggest you're doing it wrong, until the cover pops off. Don't try to lift the piece up without first sliding it over to the right; the plastic hooks will shear off otherwise.

Around Back: The Rear Fan

Corsair installs a Hong Chen fan at the back of the case, which looks similar to the company's AF140, but isn't quite as high-quality. Air flow is good. However, the blower is just too noisy for my tastes, so I put it on my replacement list. Again, the fan does exactly what it's supposed to, I'm just very particular about acoustics.

What Corsair does 100% correctly is decoupling its fan from the chassis, right at the factory, using rubber grommets. This is exactly what I do with my own custom builds, and Corsair seemingly read my mind.

Up Front: Triple the Fun...Err, Fan

The three front fans receive the same assessment as the blower around back. They offer good air flow, but they're a little too audible for me. Similar in appearance to Corsair's excellent AF120, I'm adding them to my replacement list as well. With that said, I've seen plenty of premium vendors bundle junk fans with expensive cases, and I wouldn't call the Obsidian 900D's fans junk. There's an easy way to test for this. If you try to reduce the speed of a poorly-built fan with a controller, its air flow falls to nothing. That isn't the case here.

The three fans sit behind a removable aluminum panel. Behind that, but in front of the coolers, you'll find a hinged air filter that snaps open and shut. The following animation illustrates the air filter box:

Side Lids with An Air Filter

The purpose of these lids is obvious: they facilitate quick access to installed hardware without needed to remove the massive side panels. The lids are hollow, which means that they can suck air from the bottom into the case, as long as the enclosure's interior pressure is lower than the outside pressure. You can also install radiators for liquid cooling in the lids, though the designated mounts for those are found up on top of the case.

The fabric has magnetic edges, and thus holds itself in place. I prefer not to mount additional fans or radiators there, as air flow through the bare fabric is rather negligible.