best sfx psu​ GAMEMAX

Why SFX PSUs Have Become the Core Choice for Small Form Factor Builds

In the construction of mini PCs (such as ITX cases), HTPCs, or compact workstations, SFX power supplies have emerged as critical components due to their compact size (standard dimensions: 125×63.5×100mm, approximately 2/3 the size of ATX PSUs) and high power density. Compared to traditional ATX PSUs, SFX models not only save internal case space but also accommodate high-end hardware sensitive to size constraints, such as RTX 40-series graphics cards or multi-hard drive configurations. With the popularization of ATX 3.1 and PCIe 5.1 standards, premium SFX PSUs now meet the power demands of high-load scenarios while balancing efficiency and silent operation.

2. Key Considerations for Choosing SFX PSUs: A Comprehensive Guide from Specs to Experience

1. Power Rating & Efficiency Certification: Select power based on your system configuration—450-650W for office setups, and 750W+ for gaming rigs. 80 Plus certification is a key indicator of efficiency; Gold or higher (e.g., Platinum) ensures over 90% efficiency under typical loads, saving energy and reducing heat.

2. Size & Compatibility: Confirm your case supports SFX some mini cases may require SFX-L or TFX adapters, and note how PSU thickness affects GPU/heat sink installation.

3. Modular Design: Fully or semi-modular PSUs reduce redundant cables, optimizing airflow in compact spaces—ideal for tidy cable management in small cases.

4. Cooling & Silent Operation: High-quality FDB/HDB fans with intelligent temperature control keep noise below 25dB under heavy loads, while Japanese capacitors enhance stability.

5. Support for New Standards: ATX 3.1 and PCIe 5.1 interfaces (e.g., native 12V-2×6 connectors) are essential for connecting next-gen GPUs (e.g., RTX 4090), preventing hardware damage from power fluctuations.

3. Top SFX PSU Recommendations for 2025: Covering Premium to Budget Options

▌Flagship Level: The Pinnacle of Performance and Compatibility

GameMax GS 850G BK

• Core Specs: 850W, 80 Plus Gold, native ATX 3.1/PCIe 5.1 support

• Key Features:

• Japanese 105℃ heat-resistant capacitors ensure stable operation under prolonged high loads;

• Intelligent temperature-controlled FDB fan stops at low loads, with noise <18dB;

• Fully modular design with flat cables adapts to ITX case cable management;

• Single +12V rail with high current output perfectly supports high-end GPUs like RTX 4080.

• Ideal for: High-end gaming ITX builds, professional graphics workstations.

GameMax GX-1050 PRO BK (ATX3.1 PCIe5.1)

• Core Specs: 1050W, 80 Plus Platinum, native 12V-2×6 connector

• Key Features:

• Over 92% efficiency under typical loads, nearing the limit of energy conversion;

• LLC+DC-DC topology keeps voltage fluctuations within ±1%;

• Supports 9-way GPU parallel operation, suitable for crypto mining or multi-GPU rendering.

• Ideal for: Extreme-performance mini PCs (e.g., dual-GPU ITX setups).

▌Mainstream Level: Balancing Performance and Value

GameMax GS 750G BK

• Core Specs: 750W, 80 Plus Gold, compact SFX form factor

• Key Features:

• Fully modular design retains only essential motherboard cables, minimizing redundancy;

• Smart cooling system adjusts fan speed dynamically based on temperature, balancing silence and heat dissipation;

• Supports ATX 3.0, future-proofing GPU upgrades.

• Ideal for: Mid-range gaming rigs (e.g., RTX 4070 + 13th Gen CPU combos).

GameMax GT-450G BK

• Core Specs: 450W, 80 Plus Gold, ultra-small TFX size (175×85×65mm)

• Key Features:

• 90% efficiency with only 18dBA noise, perfect for HTPCs or living room setups;

• Single PCI-E 6+2pin connector supports entry-level discrete GPUs (e.g., RTX 3050);

• Full electrical protections (OVP/OCP/SCP) safeguard hardware.

• Ideal for: Lightweight office PCs, mini entertainment centers.

▌Budget-Friendly Picks: Optimal Entry-Level SFX PSUs

GameMax GS 650G BK

• Core Specs: 650W, 80 Plus Gold, standard SFX size

• Key Features:

• Over 85% peak efficiency, approaching premium-tier performance;

• Semi-modular design (fixed motherboard/CPU cables, optional others);

• Cost-effective solution for MATX small cases or ITX builds.

• Ideal for: Mainstream gaming setups with i5/R5 CPUs + RTX 3060-level GPUs.

GameMax GT-300G WH

• Core Specs: 300W, 80 Plus Gold, ultra-small TFX form factor

• Key Features:

• 90% efficiency supports high-end Mini PCs like NUCs or industrial hosts;

• Dedicated 12V CPU power compatible with small-form-factor motherboards;

• Affordable pricing for GPU-free office/online learning setups.

• Ideal for: Low-power mini PCs, home NAS storage devices.

4. SFX PSU Installation Tips: Practical Advice to Avoid Pitfalls

1. Power Redundancy Principle: Choose a PSU with a rated power 20%-30% higher than your system’s peak load. For example, a RTX 4070 build (≈500W) needs a 750W+ PSU.

2. Interface Compatibility: Check for sufficient SATA/M.2 power connectors to avoid shortages when adding drives later.

3. Case Fit Testing: Some SFX PSUs (e.g., with modular ports) may exceed the standard 100mm thickness—verify internal case space before installation.

4. Cable Management Tricks: Use zip ties or cable channels to secure modular cables, preventing obstructions to fan inlets and maintaining cooling efficiency.

5. Conclusion: The Big Energy Revolution in Small PSUs

SFX PSUs in 2025 are no longer "compromise" choices. From 1050W Platinum-certified flagships to 300W budget models, they power high-performance hardware in compact packages. Whether you’re a gamer chasing 极致性能 or an office user preferring minimalist builds, choosing the right SFX PSU unlocks case space while ensuring stable power for your hardware. With ATX 3.1 and PCIe 5.1 standardization, prioritizing models with new interfaces future-proofs upgrades—this embodies the irreplaceable value of SFX PSUs in small-form-factor builds.