A closer look
Now that we've looked through the key specs, let's take a closer look behind those sleek black panels. And, you know, at whatever else there is to see.
That's plenty of front-panel I/O for a $160 case. Corsair supplies the usual audio jacks as well as four USB ports—two SuperSpeed and two USB 2.0. The USB 3.0 ports connect to the motherboard via a dedicated header, unlike on the 650D, where you had a couple of pass-through cables with type-A plugs, which you were supposed to connect to the rear I/O cluster.
Just like on the 350D, the lower half of the front panel can be removed to uncover the (also-removable) dust filter. Simply pushing in on the top two corners of the panel detaches it. That mechanism is convenient when clearing dust bunnies away, but it can be a pain when lugging the case around. It's easy to put your hand in the wrong spot and unlatch one side of the panel by accident.
Speaking of dust bunnies, I think the 750D is the first Corsair case we've tested that covers the top cooling vent with a removable filter. That's a nice touch. Even the 650D leaves that vent open to the elements, making it all too easy for dust, crumbs, and the like to drop in and cling to the hardware inside.
The top dust filter is rimmed with magnetic strips, which makes removal easy. The filter is also simple to put back into place; it just kinda sticks there. The magnets are pretty strong, too, so accidental removal is unlikely. The top vent can accommodate various combinations of 120-mm or 140-mm fans—or, if you're into liquid cooling, a humongous 360-mm radiator.
Unfastening the 750D's left panel reveals the internals, which are roomy. Very roomy. Corsair has forgotten none of the usual ingredients. We've got a cut-out behind the CPU socket, a generous assortment of rubber-lined cable-routing holes, tool-less drive bays, a stealthy black paint job, and so forth.
Note the default fan arrangement: two 140-mm spinners at the front and one at the back. I'm no fluid dynamics expert, but it sure seems like that arrangement will result in positive air pressure inside the case. That, in turn, should ensure that air only comes in through the filtered front vents, rather than through eaves and crannies large enough to let dust inside.
A number of Corsair's other cases, including the 650D, have more fans dedicated to exhaust than to intake, which tells me they probably have negative internal pressure. Coupled with an unfiltered top vent, negative pressure can make for a very dusty enclosure. That's the case with the Graphite Series 600T that houses my own PC, anyhow.
The 3.5" drive cages are the same as those inside the 650D and 600T. Each cage plays host to three removable trays, which can each accommodate either one 3.5" hard drive or one 2.5" SSD. The hard drives snap into the trays without the need for screws, but 2.5" drives must be screwed in.
Out of the box, the 750D comes with its two cages mounted side by side. The cages are stackable, though, so other arrangements are possible. For example, you can stack the cages on top of each other at the bottom, or you can hang them from the 5.25" bays at the top. The default arrangement is better for long graphics cards, but the stacked setups should make cable routing more convenient, especially for folks using large power supplies.
By the way, you can order additional drive cages from Corsair's website for $9.99 a piece. As far as I can tell, users should be able to supplement the two default cages with an extra pair, for a total of a dozen 3.5" bays. Three cages can be slotted in between the 5.25" bays and the bottom of the enclosure, and a fourth one can sit behind the PSU.