Rosewill 4U Server Chassis

Seven internal 3.5-inch drive bays give this 4U chassis room for a multi-drive server build, making storage capacity a central part of its appeal.

It also has two 5.25-inch device bays, ATX and CEB motherboard compatibility, and seven PCI expansion slots. That combination leaves room for a build that may grow beyond a basic single-drive setup.

A key detail is easy to miss: the 3.5-inch drives must have three screw holes on each side. Drives with only two side screw holes are not supported.

Best use cases

The RSV-R4100U is designed for rackmount server builds where several internal hard drives and expansion cards matter more than a compact desktop footprint. Its 4U format and listed ATX and CEB compatibility make it relevant for a home server or a rack-based environment, provided your motherboard and rack setup match the chassis requirements.

Picture a storage-focused server installed in a rack, with front-panel power and hard-drive indicators visible during a quick status check. The two USB 3.0 ports add accessible connections at the front, while the built-in lock and key offer a basic physical-security feature for the case. If you mainly need a small, simple enclosure for a single-drive PC, this layout may be more chassis than your build calls for.

Product specs

The chassis has seven internal 3.5-inch HDD bays, two 5.25-inch device bays, seven PCI expansion slots, and support for ATX and CEB motherboards. Its cooling setup consists of one front 120mm PWM fan and two rear 80mm PWM fans. There are also two USB 3.0 ports, front-panel power and HDD LED indicators, and a front-panel lock with key.

The drive-mounting restriction is the most important fit check: supported HDDs need three screw holes on each side for the stated three-point connection. Models with two side screw holes are explicitly unsupported. Without having tried it, fan count alone also cannot establish how loud the chassis will be in your particular build, noise can matter if the rack sits near a workspace.

Where it shines

Its strongest practical case is a server build that needs several 3.5-inch drives, expansion-card room, and a standard 4U rackmount design in one enclosure. The included fan arrangement gives the chassis dedicated front and rear airflow hardware, rather than leaving cooling entirely to separately sourced case fans. Still, the available information does not specify measured noise, fan speeds, or other cooling performance, so treat “quiet” as a stated design aim rather than a guarantee for every configuration.

You’ll appreciate it if you want a rack-oriented case with substantial internal drive capacity and front-facing status indicators. If your priority is a smaller, simpler enclosure instead, a less expandable case may be a better fit. What matters most before choosing: will every HDD you plan to install match the required side-hole pattern?

Buying verdict

This Rosewill chassis is worth considering when your build calls for a 4U rackmount case, ATX or CEB motherboard support, multiple 3.5-inch drives, and seven PCI expansion slots. Its front USB ports, status LEDs, and lock add useful access and monitoring details without changing that core purpose.

It may not suit you if your drives have only two screw holes on each side, or if you need confirmed noise levels before placing a server close to people. Check the drive mounting pattern and your motherboard format first, if both fit and the rackmount, multi-drive layout is useful to your build, the RSV-R4100U’s feature set lines up with that job.