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RB0550B 550W 80 Plus Bronze Certified ATX 3.1 Ready Power Supply Unit for ATX Cases

Prices as of September 27, 2026, as listed by each retailer — verify the current price on the retailer's site before purchase.

Price history tracked at Macy's price tracker

14-day low
$64.99
Sep 17 · Macy's
Best price
$64.99
−0% vs high
14-day high
$64.99
All stores
$65$65$65
Sep 17Sep 27
  • Macy's
Lowest in 14 days: $64.99 at Macy's. Highest: $64.99. Current best is 0% below the 14-day high.

About this product

The Lian-Li RB0550B is a 550W ATX power supply unit designed for modern computer cases, featuring ATX 3.1 readiness and a native 12V-2x6 connector to support newer graphics cards. It includes modular cabling with braided flat cables and a built-in routing channel with self-securing closure straps for efficient cable management. The unit is 80 Plus Bronze certified and equipped with a 135mm smart fan that adjusts speed based on temperature for quiet operation. It provides robust protection with six industrial-grade safeguards including over-voltage, over-current, and short-circuit protection. Compatible with standard ATX cases and back-connector motherboards.

  • 550W 80 Plus Bronze certified
  • ATX 3.1 ready
  • native 12V-2x6 PCIe connector
  • modular braided flat cables
  • 135mm smart cooling fan
  • six industrial-grade protections

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RB0550B 550W 80 Plus Bronze Certified ATX 3.1 — Price History