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A closer look—continued
Let's take a last look around the Obsidian Series 250D before we fill 'er up with components.

Yep. Those drive trays are pretty easy to get to.

Next to them lies the PSU compartment, which features a removable bracket that mounts onto the back of the power supply. (The bracket is then fastened to the back of the case via thumb screws.) Thanks to this bracket, the PSU can be inserted from the outside with very little pain. Most ATX enclosures require the PSU to be inserted from within the chassis, but the 250D isn't roomy enough for that—and even if it were, the procedure would be more awkward. The only downside of inserting the PSU from the outside is that, before the unit can go in, the power cables must be pushed through the PSU compartment and into the main chassis.

Above the storage and PSU compartments are the gap for the motherboard's I/O cluster and the expansion slot covers. Note that those are flush with the back of the case. On conventional ATX enclosures, the motherboard is recessed about a half inch from the rear panel, and the I/O cluster and expansion area site inside of a little nook. Not so on the 250D. This nook-less arrangement saves a little space inside the case, but it means expansion card brackets protrude out the back and must be screwed down outside the enclosure. (Note the little ledge at the top right of the picture.)

Finally, the 250D's rear panel plays host to two 80-mm fan mounts. Corsair doesn't include 80-mm fans in the box, but one would expect the stock 140-mm and 120-mm spinners to do a good job without any backup.

The 5.25" bay is bolted down to the frame with four screws. Those can be removed to excise the bay. Doing so frees up some space for a larger CPU heatsink, and it's also handy during the assembly process, when one generally needs as much room to maneuver as possible.

The Obsidian Series 250D has dust filters, naturally. We already saw the front filter on the previous page, but there are three additional ones. The left and right side panels both have their own filters, which stick to the metal with magnets and can thus be removed (and cleaned) without much trouble.

The fourth and final filter lies underneath the power supply. It slides out easily, even with the case screwed shut.