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SilverStone

SilverStone FX Gold Flex ATX Spec and Price in the United States

80 Plus Gold350WFLEX-ATX

Flex ATX is the smallest standard power-supply format, 81.5mm wide and 40.5mm tall, and this is the reference implementation of it: 80 PLUS Gold efficiency in a chassis a 1U rack or a NAS enclosure will take. Cooling is a single 40mm fan from 20 dBA — genuinely audible, which is the trade the format demands. Cables are fixed and the 12V rail is single. SilverStone covers its Flex ATX and TFX families for three years.

Current best price
From $116.91at Amazon.com · captured 2026-09-13View at Amazon.com

Captured periodically and may have changed.

Price history

30D90D180DAll
  • 350W
  • 500W
March 21, 202672 capturestoday · $150.33

Each point is one capture, not a list price. How we track prices

Specifications

Wattage
Efficiency
80 Plus Gold
Form factor
FLEX-ATX
Modular
Non-modular
Fan size
40 mm
Length
150 mm
SATA connectors
3
Noise
20 dBA
Warranty
3 years

Wattages

ConfigurationPart numberFan sizeLengthCurrent best price
350WSST-FX350-G40 mm150 mm
$116.91

at Amazon.com · captured 2026-09-13

500W—40 mm150 mm
$145.67

at Amazon.com · captured 2026-09-15

Guides for this category

How much power supply you actually needHow to size a PSU from what the build really draws, why headroom buys efficiency and quiet rather than safety alone, and what 80 Plus does and does not promise.

Sources

Every spec above was pulled from one of these — a field a source didn't state was left off rather than estimated.