SilverStone SX700-PT SFX 700W Power Supply - Compact Platinum

Our review of the SilverStone SX700-PT finds it aimed at builders who need a true SFX power supply that does not compromise on efficiency or noise. The unit's single biggest selling point is its 80 PLUS Platinum efficiency in a compact SFX chassis, which delivers stable power for high-performance small-form-factor systems while keeping heat and fan noise exceptionally low. It is best for compact gaming PCs, silent builds, and workstation cases where space is limited and reliable +12V output is essential.

Key Features

• SFX form factor: Fits small-form-factor cases and mini-ITX builds while providing the performance expected from larger power supplies.
• 80 PLUS Platinum efficiency: Reduces wasted heat and lowers power draw compared with lower-efficiency units, which helps cooler operation and potentially lower power bills.
• Single +12V rail: Provides a class-leading single +12V rail with strong 58.4 A output to reliably power GPUs and CPUs without worrying about multi-rail distribution.
• Quiet 92 mm FDB fan: A fluid dynamic bearing fan keeps audible noise down to around 18 dBA at low load for near-silent operation in most builds.
• All Japanese capacitors: High-quality internal components designed to improve longevity and stable voltage delivery under load.
• Fully modular cables: Allows a clean, compact build with only the cables you need connected, improving airflow and cable management.

Who It's For

The SX700-PT is for enthusiasts building compact gaming rigs or small workstations who need a powerful, efficient power source with minimal noise. It is especially suitable for mini-ITX cases and SFX conversions where a full ATX unit is impractical. The strong single +12V rail and four 6+2 pin PCIe connectors make it a good match for mid- to high-range GPUs in tight spaces.

It is not for those who require an ATX drop-in replacement without an adapter, since an ATX adapter (sold separately as PP08) is required for ATX bays. Also, buyers who are highly sensitive to cable flexibility should know that some users report stiff cables that can complicate tight routing.

Pros & Cons

Pros

• Excellent efficiency with 80 PLUS Platinum certification, reducing heat and wasted power.
• Very quiet operation from the 92 mm fluid dynamic bearing fan for low-noise systems.
• Compact SFX size with a fully modular cable set enables tidy small-form-factor builds.
• Strong single +12V rail and multiple PCIe connectors for reliable GPU support.

Cons

• Cables are reported to be very stiff by some customers, making tight cable management more difficult.
• Perceived high price may be a drawback for budget-conscious builders seeking similar wattage.

Specifications

Form factor	SFX
Wattage	700W
Efficiency	80 PLUS Platinum
Fan	92 mm FDB, ~18 dBA minimum
Rails	Single +12V, 58.4 A output
Cables	Fully modular; 4x 6+2 pin PCI-E, dual EPS 8 pin
Capacitors	All Japanese capacitors

Our Verdict

The SilverStone SX700-PT is a compelling choice for compact builds that demand high efficiency and quiet operation; its strong single +12V rail and modular cabling make it reliable for GPUs in tight cases. While cables can be stiff and the price sits at the premium end, the unit's build quality and silent performance justify the cost for many SFF enthusiasts.

Frequently Asked Questions

Can this power supply fit in an ATX case?
Yes, but it requires an ATX adapter (sold separately as PP08) to fit an ATX mounting location.

How noisy is the fan under normal use?
The 92 mm fluid dynamic bearing fan runs quietly, with idle or light-load noise around 18 dBA and remaining unobtrusive under typical desktop loads.

Are the cables long enough for typical SFF builds?
Cables are generally long enough for most layouts, though some users report the wiring is quite stiff which can make routing in tight spaces more challenging.