The H2M manages to keep the height down by only leaving space for a MicroATX (or smaller) motherboard. Essentially, SilverStone removes two slots from the bottom of an ATX mid-tower layout and sticks the space savings—1.6 inches—up top to provide extra cooling space.

At first glance, you might easily mistake the SilverStone for an ATX mid-tower. Then you’ll see the telltale mesh vent pattern wrapping around the front and onto nearly half of the left and right panels. Angled edges visually narrow the case’s 17.7-by-9.2-inch façade to better mimic traditional proportions.

Up front, we find a group of top-panel ports and buttons lined up next to the top of the right side panel. These include a power button with a logo that lights when the system is on, a reset button, an LED mode button that could potentially serve a third-party controller, a hard drive activity LED, two USB Type-A ports, a headset jack (headphone/mic combo), and a Gen 2 Type-C USB port.

(Credit: Thomas Soderstrom)

Around back, we see a 120mm exhaust fan screwed to height-adjustable mounting slots, a removable panel next to the card slots, a power-cable knockout next to the power supply mount, and a finger tab for the bottom panel’s slide-out dust filter.

(Credit: Thomas Soderstrom)

Looking more closely, the removable panel next to the slots comes off with the slot panel, so you can mount graphics cards vertically beneath the exhaust fan. If you do mount cards that way, there’s a slot inside the power supply tunnel to receive the cards’ lower tabs. (Of course, why would you want to vertical-mount a card in a case without a transparent side panel?) Meanwhile, the knockout can hold a PC power-extension cable, like the ones typically on cases that use an inside bay for the power supply. Finally, the bottom dust filter covers vents that run almost to the front panel. The filter is under both the rear power supply bay and a removable cage (more about the latter in a moment).

(Credit: Thomas Soderstrom)

Inside, we find a motherboard tray that’s designed to serve the rear-facing connectors of Asus Back to the Future (BTF) and MSI Project Zero reverse-connector motherboards (in addition to any newcomers who’d like to join the trend). You can remove the panel that closes off the twin 120mm fan mount at the front of the motherboard area; you can also reposition the removable card brace in front of it to get optimal clearance for your GPU fans.

SilverStone says that its Seta H2M provides only 350mm of space in front with 25mm-thick fans in place, but we measured 400mm and noted that the fans go on the outside of that space. SilverStone also says that the card space will shrink to a mere 250mm if you put a liquid cooling radiator and fan combo (240mm-format) on the side, but fans alone (up to 32mm thick) won’t be a problem.

(Credit: Thomas Soderstrom)

Up top, we find two rows of 120mm fan mounting slots spaced 20mm apart, so builders can put their 240mm- or 360mm-format radiators (up to 406mm in length) closer or farther from the motherboard tray. Or they could choose a 280mm-format part instead.

We also see a 73mm gap cut into the front of the power supply tunnel. This opening provides builders space to mount a 360mm-format radiator behind the front fans.

(Credit: Thomas Soderstrom)

Looking a bit more closely, we see that the top of the power supply tunnel has two more mounts for 120mm fans, but we don’t see any holes for vertical card brackets. Why would SilverStone abandon the vertical card feature after providing the space and removable card bracket you need? We couldn’t even find the feature referenced in its manual. (Advanced, and very motivated, builders will certainly find a way to make it work, though.)

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(Credit: Thomas Soderstrom)

From behind the tray, we get a better look at the side fan mount’s cover: It’s covered in grommet-lined holes that support up to three 2.5-inch drives or one 3.5-inch drive. A second tray mounted directly behind the motherboard supports a single 2.5-inch drive. You’ll find a third cage within the power supply tunnel.

(Credit: Thomas Soderstrom)

The factory lower cage position opens the front to a full 70mm of radiator- and fan-mounting space while shrinking the power supply bay to 210mm. A second set of mounts moves the cage forward, reducing front radiator space to 54mm while expanding the power supply bay to around 225mm. SilverStone ignores all those measurements and claims a maximum power supply depth of 170mm.

(Credit: Thomas Soderstrom)

If you want to get technical, the power supply tunnel device isn’t a “drive cage”; it’s actually a removable SFX power supply holder with additional drive-mounting provisions. It can support either four 2.5-inch or two 3.5-inch drives, the latter using slides on one side and screws on the other. Removing the side bracket opens the cage to receive an SFX power supply. Putting an SFX PSU in it, though, may require builders to reposition the cage, which is why it has holes for its mounting screws on all four sides.

(Credit: Thomas Soderstrom)