The **RSC-R2UT-2E8R** is a specific model of a **PCI Express (PCIe) Riser Card**, typically designed for 2U rackmount server chassis. It is an electronic component used to bridge the motherboard's PCIe slot and expansion cards, allowing them to be mounted horizontally to fit within low-profile server cases. Below is an analysis of its electronic components, technical specifications, and functions. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Form Factor** | 2U Riser Card | | **Input Interface** | PCIe x16 (Male connector to Motherboard) | | **Output Slots** | 2 x PCIe x8 (Female slots for Expansion Cards) | | **Electrical Layout** | Signal Bifurcation (Splits x16 into two x8 paths) | | **Physical Orientation** | Right-angle / Horizontal | --- ### 2. Electronic Components & Design The RSC-R2UT-2E8R is more than just a physical adapter; it contains several critical electronic elements: #### A. The Printed Circuit Board (PCB) * **High-TG Dielectric Material:** Servers generate significant heat. The PCB uses high-temperature glass transition (TG) materials to prevent warping and ensure signal integrity. * **Impedance Control:** The copper traces are etched with precise widths and spacing to maintain **85-100 ohm differential impedance**, essential for high-speed PCIe Gen 3 or Gen 4 data transmission. #### B. Signal Conditioning (Passive/Active) * **Bypass Capacitors:** Small surface-mount (SMD) capacitors are placed near the power pins to filter out high-frequency noise from the server's power supply, ensuring stable voltage to the expansion cards. * **Differential Pairs:** The data lines are routed as differential pairs to minimize Electromagnetic Interference (EMI) and crosstalk between the two x8 slots. #### C. Power Delivery * **Gold Fingers:** The bottom connector (x16) features hard gold plating to ensure low contact resistance and durability through multiple insertion cycles. * **Voltage Rails:** The card passes +12V, +3.3V, and 3.3Vaux power directly from the motherboard to the expansion slots. --- ### 3. Functional Logic: PCIe Bifurcation The "2E8R" designation indicates that this riser is designed to split a single **PCIe x16** electrical lane from the CPU/Motherboard into **two independent x8 slots**. * **Requirement:** For this electronic part to function correctly, the server motherboard BIOS must support **PCIe Bifurcation** (specifically the x8+x8 setting). * **Signal Routing:** The first 8 lanes of the x16 connector are wired to the first slot, and the remaining 8 lanes are routed to the second slot. --- ### 4. Hardware Compatibility This part is commonly found in **Supermicro** or similar enterprise server configurations. It is used to house: 1. **Network Interface Cards (NICs):** 10G, 25G, or 40G Fiber cards. 2. **RAID Controllers:** Internal storage management cards. 3. **NVMe HBA Cards:** For high-speed SSD expansion.