PCIe x16 to PCIe x16 Riser Card DD-666-2U - 2U Server Riser

In this review the iStarUSA DD-666-2U is evaluated as a focused solution for systems needing a 2U form factor riser. The bottom line: this riser is for builders and technicians who need a straightforward PCIe x16 to PCIe x16 extension in a 2 U chassis where the motherboard slot position is fixed at 6. Our review finds it most valuable for compact rack servers and custom builds that require the exact fit and RoHS compliance the model provides, rather than for general desktop upgrade seekers.

Key Features

• 2U Form Factor: Designed to fit standard 2 U server chassis and save space while enabling full-length PCIe cards to be used.
• PCIe x16 to x16 Connectivity: Provides direct pass-through of a full x16 slot, preserving bandwidth for high-performance cards.
• Model Specific Fit: The DD-666-2U model number indicates a specific mounting and pinout suited to compatible server motherboards.
• MB Slot Position 6: Clear slot positioning simplifies installation planning in multi-slot motherboards and rack layouts.
• RoHS Compliance: Built to RoHS environmental standards, reducing lead and hazardous substances for compliant deployments.

Who It's For

The DD-666-2U is aimed at system builders, IT technicians, and integrators who work with 2 U rackmount servers and need to add or relocate a PCIe x16 card without replacing the motherboard. It is well suited for deployments where chassis space and exact slot alignment matter, such as compact GPU or NIC installations in a 2 U appliance.

Users who want a general desktop upgrade, or who require multiple riser types or adjustable slot positions, should look elsewhere. This riser is specific in form and slot placement and is not a universal adjustable extender for every chassis or consumer motherboard.

Pros & Cons

Pros

• Simple, reliable way to add a full x16 slot in a 2 U chassis without complex modifications.
• Clear MB slot position (6) reduces guesswork during installation and system layout.
• RoHS compliance provides assurance for environmentally regulated deployments.

Cons

• Very specific to the 2 U form factor and slot position, so compatibility must be confirmed before purchase.

Specifications

Model Number	DD-666-2U
Form Factor	2 U
Interface	PCIe x16 to PCIe x16
MB Slot Position	6
Standard Drive Bays	None
RoHS Compliance	Yes

Our Verdict

The iStarUSA DD-666-2U is a practical, no-frills riser for professionals assembling or modifying 2 U servers who need a reliable PCIe x16 extension in a specific slot position. It offers good value when matched to compatible chassis and motherboards, but its specificity means buyers should verify fit before ordering.

Frequently Asked Questions

Is this riser compatible with all 2 U chassis?
Compatibility depends on chassis layout and motherboard slot alignment; verify that a 2 U riser with MB slot position 6 matches your system.

Does the riser change PCIe bandwidth?
No, the DD-666-2U provides a direct PCIe x16 to x16 connection and is intended to preserve x16 bandwidth when properly installed.

Is the product RoHS compliant?
Yes, the DD-666-2U is listed with RoHS Compliance Version: Yes, suitable for environmentally regulated deployments.