As a 1T1R device, the RTL8188CU lacks MU-MIMO support. In congested environments, latency increases and throughput drops non-linearly. It is not suitable for high-density access point applications.
| Condition | Signal Strength | PHY Rate | TCP Throughput | |-----------|----------------|----------|----------------| | Very close (1–3 m, LOS) | -30 dBm | 150 Mbps | ~85–95 Mbps | | Medium (10 m, one wall) | -55 dBm | 90–120 Mbps | ~50–70 Mbps | | Far (20 m, two walls) | -70 dBm | 30–60 Mbps | ~15–35 Mbps | | Fringe (>30 m) | -80 dBm | 1–11 Mbps | <5 Mbps |
As of 2026, while newer WiFi standards exist, the RTL8188CU remains a popular choice for retrofitting older PCs, connecting desktop computers, and enhancing IoT projects like Raspberry Pi due to its affordability and widespread compatibility. 1. Key Specifications and Technical Capabilities