Hover to zoom · click for full imageA compact 550W 80 PLUS Bronze ATX 3.1 power supply with a native 12V-2x6 connector and a quiet 135mm fan, built for tidy budget and mainstream gaming builds.
The RB-550B is Lian Li's entry into efficient, future-ready power delivery for everyday gaming and productivity PCs. Despite its approachable 550W rating, it is fully built to the latest ATX 3.1 standard and ships with a native 12V-2x6 cable, so it can power a current-generation graphics card without clunky adapters.
Its semi-modular layout keeps the essential 24-pin ATX, CPU EPS and PCIe cables permanently wired for reliability, while SATA and peripheral cables plug in only when you need them. Integrated hook-and-loop straps on three sides make routing and bundling cables inside compact cases genuinely easy. A temperature-controlled 135mm fan keeps the unit near-silent at light loads and only spins up when the system demands it.
| Spec | Value |
|---|---|
| Wattage | 550W |
| Form Factor | ATX |
| ATX Specification | ATX 3.1 |
| PCIe Standard | PCIe 5.1 |
| Efficiency | 80 PLUS Bronze (up to 85% at 50% load) |
| Type | Semi-Modular (fixed 24-pin ATX, CPU-EPS and PCIe/12V-2x6; modular SATA and peripheral) |
| Main Connectors | Native 12V-2x6 (16-pin), PCIe 6+2-pin, 24-pin ATX, CPU-EPS |
| +12V Rail | Single rail, 45.8A (549.6W combined) |
| +3.3V & +5V Combined | 100W |
| Cooling Fan | 135mm HYB temperature-controlled fan |
| Protections | OVP, UVP, OCP, OPP, OTP, SCP |
| Dimensions (D x W x H) | 150 x 86 x 150mm |
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