RIITOP Quad PCIe NVMe Adapter PCIe 4.0 x16 to 4x M.2 - 2U Low-Profile

In this review the RIITOP Quad PCIe NVMe Adapter is evaluated for users who need to expand NVMe capacity in a space-constrained server or workstation. The bottom line: it is a practical converter for motherboards that support PCIe x16 bifurcation, allowing four M.2 NVMe drives to run at full link speed when the platform and CPU can provide the lanes. If you need dense, direct NVMe expansion in a 2U chassis and can configure BIOS bifurcation, this adapter delivers straightforward installation and clear status feedback.

Key Features

• Quad M.2 Support: Adds four M.2 PCIe (M key) NVMe SSDs to a single PCIe x16 slot when the motherboard supports bifurcation, increasing local flash capacity without additional controllers.
• PCIe 4.0/3.0 Compatibility: Works in PCIe 4.0 or 3.0 x16 slots and can deliver up to 4x 32Gbps aggregate throughput when the host supports the lanes.
• 2U Low-Profile Design: The included low-profile bracket and staggered two-per-side slot layout reduce overall card height for tight server environments.
• Individual LEDs: Each M.2 slot has its own LED indicator to show working status, simplifying troubleshooting during installation and operation.
• Wide M.2 Size Support: Accepts 22110, 2280, 2260 and 2242 NVMe SSDs so users can mix common form factors for density or capacity needs.

Who It's For

This adapter is best for system builders, IT pros and workstation users who run servers or motherboards that explicitly support PCIe x16 bifurcation and who want to add four NVMe drives for high-capacity, low-latency storage. It fits applications where a compact, low-profile card is required such as 2U racks and small chassis.

Users who should look elsewhere include those with motherboards that do not expose bifurcation settings or older systems that cannot boot from PCIe devices; in those cases only one M.2 may be recognized and the intended multi-drive setup will not work. Also this card does not provide a hardware RAID controller, so those needing built-in RAID should choose a dedicated RAID card.

Pros & Cons

Pros

• Enables four native NVMe SSDs from a single x16 slot when the motherboard supports bifurcation.
• Low-profile layout and compact height are suitable for 2U servers and tight cases.
• Per-slot LEDs make drive status and troubleshooting straightforward.
• Supports multiple M.2 lengths common in enterprise and consumer NVMe ranges.

Cons

• Requires motherboard PCIe x16 bifurcation and sufficient CPU lanes; without that only one SSD may be recognized.
• Does not include a hardware RAID controller, so RAID must be handled by OS or third-party software.

Specifications

Brand	RIITOP
Interface	PCIe 4.0/3.0 x16 (requires bifurcation)
Drive Bays	4 x M.2 PCIe NVMe (M key)
Supported M.2 Sizes	22110, 2280, 2260, 2242
Design	Low-profile bracket for 2U cases, two slots per side
LED Indicators	Individual per-slot working status LEDs
OS Compatibility	Windows 11/10/8, Linux, Mac OS (boot depends on motherboard)

Our Verdict

The RIITOP Quad PCIe NVMe Adapter is a solid, cost-effective way to add four NVMe drives to systems that support PCIe x16 bifurcation and that have enough CPU lanes. It is particularly good value for 2U servers and workstations needing dense NVMe capacity with simple installation and per-drive status LEDs. Buyers must verify motherboard bifurcation and be prepared to manage RAID in software if required.

Frequently Asked Questions

Will this card boot my OS?
Older motherboards may not support booting from a PCIe expansion card; check the motherboard manual and BIOS options for PCIe boot support.

Do I need special SSDs?
Use M.2 PCIe NVMe SSDs with an M key in supported lengths; SATA-based or B+M key drives are not supported.

Is hardware RAID supported?
No, the adapter does not include a hardware RAID controller; create RAID with the OS or third-party software if needed.