When building a high-performance PC, the power supply, often regarded as the "heart" of the computer, plays a crucial role. When selecting a power supply, size specifications are key factors that cannot be overlooked. They not only determine whether the power supply fits the chassis but also affect its performance and heat dissipation to a certain extent. Currently, the mainstream sizes of PC power supplies on the market are mainly divided into two types: ATX and SFX. This article will provide an in-depth analysis of these two specifications and combine them with popular products from GAMEMAX to help you find the most suitable power supply.
ATX (Advanced Technology Extended) power supplies are the most common power supply specifications on the market and are widely used in desktop computers. The standard size of an ATX power supply is 150mm (width) × 140mm (height) × 86mm (depth). This size design allows it to accommodate more electronic components, thereby providing more powerful power output and more stable power supply.
Due to its larger internal space, ATX power supplies also have an advantage in heat dissipation design. They are usually equipped with large-sized cooling fans, which can effectively reduce the internal temperature of the power supply and ensure stable operation for long periods. In terms of power, ATX power supplies cover a wide range, from 300W to 1600W or even higher. Whether it is for daily office work, entertainment, or running high-end graphics cards and multi-core processors in enthusiast gaming rigs, you can find an ATX power supply with a suitable power rating.
Take the GAMEMAX RGB-SMART 1300 WH as an example. This 1300W power supply is of the ATX 3.0/3.1 specification, supports PCIe 5.0/5.1, and has an 80 PLUS Platinum certification with a conversion efficiency of up to 92%. It features a fully modular design, an LLC + DC-DC architecture, and a powerful single +12V rail, providing stable and robust power support for high-end hardware. The 140mm ARGB fan has 25 lighting modes and can synchronize lighting effects with major motherboard brands, offering not only excellent performance but also adding a cool atmosphere to the chassis. Another example is the GX-1250 PRO BK. With a power of 1250W, it also achieves an 80 PLUS Platinum certification, conforms to the ATX 3.1 and PCIe 5.1 standards. It can directly supply power to RTX™ 40 series graphics cards through the 12V-2*6 connector, reducing current loss. The LLC MPS 1213 chipset optimizes the LLC resonant circuit, ensuring efficient operation under various loads.
SFX (Small Form Factor) power supplies, on the other hand, focus on compactness and portability. Their standard size is 125mm (width) × 63.5mm (height) × 100mm (depth), which is only about one-third the volume of an ATX power supply. Thanks to their small size, SFX power supplies have become the ideal choice for mini chassis, HTPCs (Home Theater Personal Computers), and other small-sized hosts.
Although SFX power supplies are small in size, their performance is not inferior. With the development of technology, there are now many high-power SFX power supplies on the market. However, due to the limited space, the cooling fans of SFX power supplies are relatively small, resulting in greater heat dissipation pressure during high-load operation. Therefore, some high-end SFX power supplies adopt more efficient heat dissipation solutions and components to ensure stable performance.
The GS-700 series of SFX power supplies from GAMEMAX is a great example. Take the GS-700 BLACK as an instance. It has a rated power of 700W and dimensions of 125mm (length) × 100mm (width) × 63.5mm (height), fully conforming to the SFX standard. This power supply has an 80 PLUS certification, excellent voltage regulation capabilities, and an intelligent fan controller, ensuring reliable operation. It is worth mentioning that it comes with an SFX to ATX adapter bracket. Users can install it not only in SFX-specification chassis but also in standard ATX chassis if they want to reserve more space to optimize the internal airflow of the chassis. GAMEMAX's hybrid fan control technology automatically adjusts heat dissipation according to actual needs, ensuring efficient operation of the power supply under various working conditions. Models such as GS-650 G WH, GS-750 G WH, and GS-850 G WH also share these advantages, providing a rich selection for users of small-sized hosts with different power requirements.
If you are using a standard mid-tower or full-tower chassis, almost all ATX power supplies can be perfectly adapted, and you don't need to worry too much about size issues. For ITX mini chassis and small HTPC chassis, SFX power supplies are the right choice to ensure that the power supply fits the chassis space and avoid installation problems due to size mismatch.
If you pursue ultimate performance, plan to install high-end graphics cards and multi-core processors, and need high-power support, ATX power supplies, with their rich selection of high-power products, can better meet your needs. If you are only building a small host for daily office work and light entertainment, a low- to medium-power SFX power supply is sufficient.
Generally, for power supplies of the same power and certification level, SFX power supplies are slightly more expensive than ATX power supplies due to higher design and production difficulties. When purchasing, combine your budget and choose a cost-effective product on the premise of meeting performance and size requirements.
ATX and SFX power supplies each have their own advantages, and there is no absolute superiority or inferiority. When choosing a PC power supply, the key is to comprehensively consider your chassis type, performance requirements, and budget, so as to select the "best power supply" that suits you and provide a solid guarantee for the stable operation of your computer.
GameMax GX 600G 80+ Gold Wired ATX Power Supply, High Efficiency: Over 92% efficient with LLC & DC-DC technology, saving energy and reducing heat.
• Silent Operation: FDB fan design keeps noise low, even under heavy loads.
• Stable & Durable: Features all-solid capacitors and SMT components for long-lasting reliability.
• Broad Compatibility: Supports 110-240Vac input and latest graphics cards with multiple PCIE interfaces.
• Comprehensive Protection: Seven levels of safeguards protect your system from potential damage.
GS 650G 80 Plus Gold Certified SFX Power Supply with Intelligent Cooling, Japanese Capacitors, and Comprehensive Protection
• 80 Plus Gold Certified Efficiency: Enhances power efficiency and stability, reducing the risk of system crashes.
• High-Quality Japanese Capacitors: Ensures long-term reliability and stability with 105°C electrolytic and solid-state capacitors.
• Intelligent Fan Control: 9.2cm hydraulic bearing fan with PWM automatic control starts and stops based on power consumption (above 20% and below), optimizing cooling and noise.
• Advanced Wireless Output Design: Gold-plated pins and high-density copper posts enable efficient, reliable power output and improved heat dissipation.
• Comprehensive Circuit Protection: Provides multi-layered protection (OPP, OVP, UVP, OCP, SCP, OTP) to safeguard your PC and components from damage.
GameMax GX 700G 80+ Gold Wired ATX Power Supply, High Efficiency: Over 92% efficient with LLC & DC-DC technology, saving energy and reducing heat.
• Silent Operation: FDB fan design keeps noise low, even under heavy loads.
• Stable & Durable: Features all-solid capacitors and SMT components for long-lasting reliability.
• Broad Compatibility: Supports 110-240Vac input and latest graphics cards with multiple PCIE interfaces.
• Comprehensive Protection: Seven levels of safeguards protect your system from potential damage.
GS 750G 80 Plus Gold Certified SFX Power Supply with Intelligent Cooling, Japanese Capacitors, and Comprehensive Protection
• 80 Plus Gold Certified Efficiency: Enhances power efficiency and stability, reducing the risk of system crashes.
• High-Quality Japanese Capacitors: Ensures long-term reliability and stability with 105°C electrolytic and solid-state capacitors.
• Intelligent Fan Control: 9.2cm hydraulic bearing fan with PWM automatic control starts and stops based on power consumption (above 20% and below), optimizing cooling and noise.
• Advanced Wireless Output Design: Gold-plated pins and high-density copper posts enable efficient, reliable power output and improved heat dissipation.
• Comprehensive Circuit Protection: Provides multi-layered protection (OPP, OVP, UVP, OCP, SCP, OTP) to safeguard your PC and components from damage.
GX PRO 750G 80 Plus Gold Modular Power Supply: ATX3.1 Ready, Silent Cooling, & Premium Durability
• 80 Plus Gold Efficiency & Quiet Operation: Achieves 90% efficiency under typical loads with APFC+LLC+DC-DC design, minimizing power waste and noise.
• Premium Durability & Reliability: Built with Japanese 105°C capacitors and solid capacitors for long-term stability and performance.
• ATX3.1 & PCIe5.1 Ready: Features a native 12V-2x6 connector for seamless RTX 40/50 GPU compatibility and efficient power delivery.
• Advanced Thermal Management: 13.5cm FDB fan with intelligent temperature control ensures quiet cooling and optimal heat dissipation.
• Modular Design & Robust Protection: Fully modular layout with dual-stage EMI filtering and NTC thermistor safeguards against surges, while gold-plated cables ensure durable, high-conductivity connections.
GS 850G 80 Plus Gold Certified SFX Power Supply with Intelligent Cooling, Japanese Capacitors, and Comprehensive Protection
• 80 Plus Gold Certified Efficiency: Enhances power efficiency and stability, reducing the risk of system crashes.
• High-Quality Japanese Capacitors: Ensures long-term reliability and stability with 105°C electrolytic and solid-state capacitors.
• Intelligent Fan Control: 9.2cm hydraulic bearing fan with PWM automatic control starts and stops based on power consumption (above 20% and below), optimizing cooling and noise.
• Advanced Wireless Output Design: Gold-plated pins and high-density copper posts enable efficient, reliable power output and improved heat dissipation.
• Comprehensive Circuit Protection: Provides multi-layered protection (OPP, OVP, UVP, OCP, SCP, OTP) to safeguard your PC and components from damage.
GX PRO 850G 80 Plus Gold Modular Power Supply: ATX3.1 Ready, Silent Cooling, & Premium Durability
• 80 Plus Gold Efficiency & Quiet Operation: Achieves 90% efficiency under typical loads with APFC+LLC+DC-DC design, minimizing power waste and noise.
• Premium Durability & Reliability: Built with Japanese 105°C capacitors and solid capacitors for long-term stability and performance.
• ATX3.1 & PCIe5.1 Ready: Features a native 12V-2x6 connector for seamless RTX 40/50 GPU compatibility and efficient power delivery.
• Advanced Thermal Management: 13.5cm FDB fan with intelligent temperature control ensures quiet cooling and optimal heat dissipation.
• Modular Design & Robust Protection: Fully modular layout with dual-stage EMI filtering and NTC thermistor safeguards against surges, while gold-plated cables ensure durable, high-conductivity connections.
GX PRO 1050G 80 Plus Gold Modular Power Supply: ATX3.1 Ready, Silent Cooling, & Premium Durability
• 80 Plus Gold Efficiency & Quiet Operation: Achieves 90% efficiency under typical loads with APFC+LLC+DC-DC design, minimizing power waste and noise.
• Premium Durability & Reliability: Built with Japanese 105°C capacitors and solid capacitors for long-term stability and performance.
• ATX3.1 & PCIe5.1 Ready: Features a native 12V-2x6 connector for seamless RTX 40/50 GPU compatibility and efficient power delivery.
• Advanced Thermal Management: 13.5cm FDB fan with intelligent temperature control ensures quiet cooling and optimal heat dissipation.
• Modular Design & Robust Protection: Fully modular layout with dual-stage EMI filtering and NTC thermistor safeguards against surges, while gold-plated cables ensure durable, high-conductivity connections.
GX PRO 1250G 80 Plus Gold Modular Power Supply: ATX3.1 Ready, Silent Cooling, & Premium Durability
• 80 Plus Gold Efficiency & Quiet Operation: Achieves 90% efficiency under typical loads with APFC+LLC+DC-DC design, minimizing power waste and noise.
• Premium Durability & Reliability: Built with Japanese 105°C capacitors and solid capacitors for long-term stability and performance.
• ATX3.1 & PCIe5.1 Ready: Features a native 12V-2x6 connector for seamless RTX 40/50 GPU compatibility and efficient power delivery.
• Advanced Thermal Management: 13.5cm FDB fan with intelligent temperature control ensures quiet cooling and optimal heat dissipation.
• Modular Design & Robust Protection: Fully modular layout with dual-stage EMI filtering and NTC thermistor safeguards against surges, while gold-plated cables ensure durable, high-conductivity connections.
