Best 700-800W Power Supplies for PCs

The 1stPlayer PS-700FK is one of the most affordable 700-watt power supplies on the market. The cost-effectiveness was achieved by foregoing the paid 80 PLUS certification. Despite this, the manufacturer claims an efficiency of up to 85%. Considering the brand's good reputation, these claims can be trusted. The high efficiency was achieved through active power factor correction (PFC).

On the main +12V rail, which powers the most energy-intensive PC components (CPU and GPU), up to 90% of the total power supply capacity is delivered. Voltage stabilization for the +3.3V and +5V rails uses traditional group regulation but with an improved Double Forward topology. ChengX and AsiaX capacitors are rated for temperatures up to 85 degrees Celsius.

The Xiongli fan features stylish white blades and a hydraulic bearing, which is better than a standard sleeve bearing but inferior to a hydrodynamic bearing. In addition to the mandatory protections against short circuits and voltage spikes, it can even withstand a lightning strike. This indicates that 1stPlayer did not skimp on including a varistor, a component often omitted by less responsible power supply manufacturers to cut costs.

The Zalman Decamax ZM700-LX3 is a South Korean power supply featuring a high-temperature 105°C capacitor and a durable hydrodynamic fan rated for 100,000 hours of reliable operation. Under low load, the fan noise is barely audible, with only semi-passive models being quieter, as their fans completely stop spinning.

Officially certified as 80 PLUS White, it achieves an 80% efficiency under various load scenarios: 20%, 50%, and 100%. The active power factor correction (APFC) reaches a maximum of 99%. An EMI filter is installed on the power input to prevent electromagnetic interference with other devices connected to the household electrical network.

The main +12V rail is a solid Single Rail design, unlike simpler power supplies that often split it into multiple sub-rails. The CPU cable is 70 cm long, and the 24-pin motherboard cable is sleeved in nylon mesh to prevent it from fraying into separate strands. The remaining cables are flat and flexible, making them ideal for hidden routing behind the PC case’s back panel—all of this for an affordable price of $50.

The 2E Solid Power Pro 750W is a semi-modular power supply of the new ATX 3.1 standard, certified for 80 PLUS Bronze energy efficiency (with over 85% efficiency). Essential cables for the CPU and motherboard, which are indispensable for assembling a PC, are fixed. The remaining cables are detachable, allowing you to use only those required for your specific PC configuration.

The ATX 3.1 standard includes a reinforced 16-pin power cable for GPUs. This cable is optional for PCI-Express 4.0 GPUs but mandatory for PCI-Express 5.0 GPUs, such as the recently introduced NVIDIA GeForce RTX 5000 series. Additionally, an ATX 3.1 power supply must handle double the GPU's power consumption peaks lasting several milliseconds.

In addition to the trendy 16-pin cable, the package also includes classic 6+2-pin connectors. Thanks to the modular design, you’ll only need to use one of the two options: the 16-pin cable for modern GPUs like the RTX 4000/5000 series or a pair of 6+2-pin connectors for previous-generation GPUs. Besides the 750W model, the 2E Solid Power Pro series also features a more powerful 850W version.

The Chieftec Vega PPG-750-S is an 80+ Gold power supply with an efficiency of up to 92%. This high efficiency is achieved through an advanced Half-Bridge topology with LLC digital stabilization, providing independent regulation for each DC-DC rail. It delivers 750 watts on the +12V rail, with an additional ~100 watts on the +3.3V and +5V rails, meaning the total output power exceeds the rated specification.

Compliant with ATX 3.1 and PCIe Gen 5 standards, the power supply features an improved 16-pin GPU connector that resists melting under excessive bending, a problem sometimes encountered with ATX 3.0 connectors. It operates within a wide input voltage range of 100-240V, designed to support simultaneous sales in both the U.S. and Europe, where outlet voltages differ.

In practice, the wide input voltage range proved useful in cases of significant voltage drops in the power grid, especially in rural homes. The power supply is equipped with comprehensive electrical protections: OVP and UVP to guard against overvoltage and undervoltage, OCP and SIP for protection from excessive steady and inrush currents, OPP for overload protection, SCP for short-circuit protection, and OTP to prevent overheating. Cooling is provided by a low-speed 135mm FDB fan, ensuring quiet operation.

The DeepCool PL800D is a Bronze-certified power supply that builds upon the previous DeepCool PK model, upgraded to the ATX 3.0 standard and enhanced with a 12VHPWR cable. This is the official name for the 16-pin connector designed for PCIe 5.0 GPUs, capable of delivering up to 450W. In addition to this, the unit includes three 6+2-pin connectors for legacy GPUs.

It also features a pair of separate 4-pin CPU cables, allowing for the assembly of a workstation with dual CPUs, such as Intel Xeon or AMD Threadripper. The circuitry includes Active PFC and DC-DC technologies. The electrolytic capacitor provides a hold-up time of 16+ milliseconds during power outages. All cables, including the 24-pin motherboard cable, are designed as flat ribbons for easier management and routing.

It can operate in ambient temperatures ranging from 0 to 40°C. The 12cm fan is built on a hydraulic bearing (HYB). The manufacturer claims a lifespan of 100,000 hours, though this figure likely refers to the overall circuitry rather than specifically the fan. Nevertheless, the power supply comes with an extended 5-year warranty, rather than the standard 3 years.