SilverStone SX700-PT 700W SFX Power Supply
Overview
The SilverStone SX700-PT 700W SFX Power Supply sits at the top of SilverStone's SX lineup as its flagship platinum-rated unit, and that positioning is earned. SFX units have to pack serious output into a chassis roughly half the volume of a standard ATX supply — a genuine engineering constraint that most builders only fully appreciate when they are elbow-deep in a compact case. This compact PSU targets ITX and SFF enthusiasts who need 700 watts of headroom without giving up their small-footprint build. The premium price tag signals exactly what you are getting: a unit built with quality internals, serious efficiency credentials, and long-term reliability in mind.
Features & Benefits
Efficiency is where this SFX power supply earns its credentials most visibly. The 80 Plus Platinum rating means it operates at over 90% efficiency under typical loads, which keeps waste heat to a minimum — important in any build, but critical when your case has almost no thermal headroom. The 92mm fluid dynamic bearing fan is rated as low as 18 dBA, making it genuinely quiet rather than just marketed as quiet. Inside, all-Japanese capacitors handle power delivery with the stability and longevity that budget units simply cannot match. The single +12V rail keeps things clean for power-hungry GPUs. One caveat worth knowing upfront: if you are installing this in an ATX case, the PP08 adapter is sold separately.
Best For
This compact PSU makes the most sense for ITX and SFF builders who are pairing a high-end GPU with a modern CPU and need the wattage to handle both under full load. If you are running something power-hungry — a flagship discrete graphics card in a sub-20-liter case, for instance — 700 watts of headroom in SFX packaging is genuinely hard to find at this quality level. It also makes a strong case for anyone building a near-silent workstation, where the low fan noise matters as much as the power output. If you are upgrading from a Gold-rated unit and want a meaningful efficiency bump, the jump to Platinum is noticeable over time, especially in systems that run long hours.
User Feedback
Owners of the SX700-PT tend to agree on a few things. Quiet operation is the most frequently praised characteristic — buyers who upgraded from noisier units consistently note the difference. Voltage stability under load also draws repeated mention, which matters when you are pushing a demanding GPU build without much room for thermal fluctuation. That said, a recurring frustration is the ATX adapter situation — enough buyers were caught off guard by the separate purchase that it is worth flagging loudly. Some also note that cable length can feel limiting in taller SFF cases. On the value question, opinions split predictably: enthusiasts who understand what all-Japanese caps and platinum efficiency actually cost to produce tend to feel it is justified; bargain-hunters do not.
Pros
- Near-silent operation at load — the 92mm FDB fan is one of the quietest in the SFX segment.
- 80 Plus Platinum efficiency keeps waste heat low, which matters enormously in tight SFF cases.
- All-Japanese capacitors give this compact PSU a reliability edge over cheaper alternatives.
- Single +12V rail delivers clean, uncomplicated power to modern GPUs without balancing act.
- Compact dimensions make it compatible with the smallest ITX cases on the market.
- Voltage stability under full load is consistently praised by builders running demanding configurations.
- Power density is class-leading — 700 watts in a unit this small is a genuine engineering achievement.
- SilverStone's SX lineup has a proven track record, and this sits at the top of it for good reason.
- Long-term owners report no degradation in performance or noise levels after extended use.
Cons
- The PP08 ATX adapter is sold separately, which catches many buyers off guard at checkout.
- Cable length can feel restrictive in taller SFF cases, requiring careful route planning.
- The price premium is significant — buyers who do not need SFX form factor are overpaying for compactness.
- No semi-passive or zero-RPM mode means the fan runs continuously, even at very light loads.
- Modular cable options are more limited compared to full-size PSUs in a similar price bracket.
- Sourcing replacement or extended cables in SFX length is harder than for standard ATX units.
- At this wattage tier, a handful of competing SFX units offer similar specs at a lower cost.
- Heavier than expected at 4.58 pounds, which can matter in ultra-lightweight portable ITX builds.
Ratings
The scores below for the SilverStone SX700-PT 700W SFX Power Supply were generated by AI after analyzing thousands of verified buyer reviews from global markets, with spam, incentivized feedback, and bot activity actively filtered out. Both the genuine strengths and the recurring frustrations are reflected in each category — nothing has been glossed over. If a category scores lower than expected, the reasoning is explained directly in the breakdown.
Noise Level
Efficiency
Build Quality
Power Stability
Form Factor Fit
Cable Management
Value for Money
Thermal Performance
Compatibility
Installation Experience
Longevity
Fan Quality
Power Density
Suitable for:
The SilverStone SX700-PT 700W SFX Power Supply was built for a specific kind of builder, and if you fall into that category, it is hard to beat. This is the unit for anyone assembling a high-performance ITX or SFF system where physical space is a hard constraint, not just a preference. If you are pairing a power-hungry discrete GPU with a modern CPU and need 700 watts of clean, stable power in a package small enough to fit compact cases, the options at this quality level are genuinely limited. It also suits builders who care deeply about long-term system health — the all-Japanese capacitors and platinum efficiency rating are not marketing details, they are indicators of how this unit is built to last. Quiet-PC enthusiasts will appreciate that the fan noise floor is low enough to disappear in a silent or near-silent build.
Not suitable for:
The SilverStone SX700-PT 700W SFX Power Supply is a poor fit for buyers who are not specifically constrained by case size. If you are building in a standard mid-tower or full-tower ATX chassis, you will find better value in a full-size PSU with more modular cable flexibility and a lower price per watt. Budget-conscious builders should also look elsewhere — the premium here reflects component quality, not inflated branding, but that distinction only matters if you plan to keep the system running for years. If you need ATX form factor compatibility, note that the required PP08 adapter is sold separately, which adds cost and a step that some buyers miss entirely until the parts arrive. Those who need more than 700 watts for extreme multi-GPU or workstation workloads will also find this compact PSU undersized for their needs.
Specifications
- Form Factor: This unit follows the standard SFX form factor, making it compatible with SFX and SFX-L cases without modification.
- Output Wattage: The supply delivers a continuous 700W of output power, suitable for high-TDP gaming and workstation configurations.
- Efficiency Rating: Certified at 80 Plus Platinum, the unit operates above 90% efficiency at typical load levels, reducing heat output and energy waste.
- Rail Configuration: A single +12V rail handles all primary power delivery, simplifying load distribution for modern CPUs and discrete GPUs.
- Fan Size: Cooling is handled by a 92mm fluid dynamic bearing fan, a larger-than-typical choice for SFX units that contributes to quieter operation.
- Minimum Noise: Fan noise is rated as low as 18 dBA at minimum speed, placing it among the quietest actively cooled SFX power supplies available.
- Capacitors: All internal capacitors are sourced from Japanese manufacturers, which is associated with better longevity and more stable power delivery over time.
- Dimensions: The unit measures 3.94 x 4.92 x 2.5 inches (D x W x H), conforming to standard SFX specifications.
- Weight: The SX700-PT weighs 4.58 pounds, which is typical for a high-output SFX unit with a full internal component complement.
- ATX Compatibility: Installation in ATX cases requires the separately purchased SilverStone PP08 bracket adapter, which is not included in the box.
- Connector Type: Output connectors follow the ATX standard, covering the full range of modern motherboard, GPU, and peripheral power requirements.
- Cooling Method: The unit uses active air cooling via the 92mm FDB fan, with no passive or zero-RPM mode — the fan runs at all times.
- Capacitor Origin: All electrolytic capacitors are Japanese-sourced, a specification that indicates higher thermal tolerance and a longer rated lifespan.
- Product Series: The SX700-PT belongs to SilverStone's SX product line, which focuses on high-performance power supplies in compact SFX packaging.
- Compatible Devices: Designed for use in desktop PCs, specifically ITX and SFF builds where standard ATX power supplies do not physically fit.
Related Reviews
SilverStone SX700-LPT 700W SFX-L Power Supply
SilverStone EX500-B 500W SFX Power Supply
SilverStone TX700-G 700W TFX Power Supply
SilverStone Technology SST-ST45SF-V3 450W SFX Power Supply
SilverStone SX750 Platinum 750W SFX Fully Modular Power Supply
SilverStone Tek ST70F-PB 700W 80PLUS Bronze Fully Modular Power Supply
SilverStone SX800-LTI 800W SFX-L Power Supply
SilverStone SX500-G 500W SFX Fully Modular 80 Plus Gold Power Supply
ESGAMING 700W ATX Non-Modular Power Supply
