5.1.22.0 Driver Ralink -

This driver predates the Windows 7 logo certification program. No Microsoft WHQL signature exists for this exact version; OEM-signed versions may vary. 4. Supported Hardware (Chipset Matrix) Driver 5.1.22.0 supports the following Ralink USB chipsets via the [RALINK.NT.5.1] and [RALINK.NT.6.0] INF sections:

| Chipset | USB IDs (example) | Max PHY Rate | MIMO Config | Known Issues | |-------------|-------------------------|--------------|-------------|--------------------------------------------| | RT2770 | USB\VID_148F&PID_2770 | 300 Mbps | 2x2 | High CPU usage under load. | | RT2870 | USB\VID_148F&PID_2870 | 300 Mbps | 2x2 | Most stable with this driver. | | RT3070 | USB\VID_148F&PID_3070 | 150 Mbps | 1x1 | Intermittent disconnect in mixed b/g/n mode. | | RT2070 | USB\VID_148F&PID_2070 | 150 Mbps | 1x1 | Poor WPA2 rekey handling. | 5.1.22.0 driver ralink

| Metric | Driver 5.1.22.0 | Later driver 5.1.25.0 | |-------------------------------|----------------|------------------------| | UDP throughput (iperf) | 92 Mbps | 101 Mbps | | TCP throughput | 85 Mbps | 96 Mbps | | Ping latency (to AP) | 3–8 ms | 2–5 ms | | CPU usage (iperf load) | 18–24% | 12–16% | | Association time from suspend | 4.2 sec | 1.8 sec | This driver predates the Windows 7 logo certification