Even though the original Corsair HX850 power supply received the 80 Plus Gold certification, Corsair decided to downgrade it to the 80 Plus Silver certification, as the manufacturer felt the 80 Plus Gold levels couldn’t be sustained at high temperatures. (Wouldn’t it be great if all manufacturers had this kind of concern?) Now Corsair is releasing a revamped version of its HX850, the HX850 Gold. Let’s see if this new version is a good product.
Officially, the name of the new version of the HX850 is simply “HX850.” We decided to call it “HX850 Gold” to make it clear which product we are talking about, since Corsair didn’t opt to include a “V2” after the name of this new unit, as it has been doing with the revised version of its other power supplies. The original HX850 used the part number “CMPSU-850HX,” but the new model has a completely different part number: “CP-9020032.”
Similarly to the original HX850, the HX850 Gold is manufactured by CWT. Internally, however, the two units are completely different.
The Corsair HX850 Gold is 7.1” (180 mm) deep, using a 140 mm ball-bearing fan on its bottom (Hong Hua HA1425H12B-Z). The power supply only turns on its fan when load is above 20 percent. This way, the power supply produces no noise at light loads.
The reviewed power supply has a modular cabling system with 10 connectors: four for video cards or ATX12V/EPS12V connectors and six for SATA or peripheral power connectors. The main motherboard cable, the ATX12V/EPS12V cable, and two video card cables are permanently attached to the power supply. These cables are protected with nylon sleeves, which come from inside the unit. This power supply comes with the following cables:
- Main motherboard cable with a 20/24-pin connector, 22” (56 cm) long, permanently attached to the power supply
- One cable with two ATX12V connectors that together form an EPS12V connector, 25.2” (64 cm) long, permanently attached to the power supply
- One cable with two ATX12V connectors that together form an EPS12V connector, 22” (56 cm) long, modular cabling system
- Two cables, each with one six/eight-pin connector for video cards, 22” (56 cm) long, permanently attached to the power supply
- Four cables, each with one six/eight-pin connector for video cards, 22” (56 cm) long, modular cabling system
- Three cables, each with four SATA power connectors: one cable with 21.6” (55 cm) to the first connector and 3.9” (10 cm) between connectors, and two cables with 15.8” (40 cm) to the first connector and 3.9” (10 cm) between connectors, modular cabling system
- Three cables, each with four standard peripheral power connectors, 17.7” (45 cm) to the first connector, 3.9” (10 cm) between connectors, modular cabling system
- Two adapters to convert one standard peripheral power connector into one floppy disk drive power connector
All wires are 18 AWG, which is the minimum recommended gauge, except the main motherboard cable, which uses thicker 16 AWG wires. The number of connectors is excellent for an 850 W power supply, allowing you to install three high-end video cards that require two auxiliary power connectors each without the need for adapters.
Let’s now take an in-depth look inside this power supply.
- 1. Introduction
- 2. A Look Inside the Corsair HX850 Gold
- 3. Transient Filtering Stage
- 4. Primary Analysis
- 5. Secondary Analysis
- 6. Power Distribution
- 7. Load Tests
- 8. Ripple and Noise Tests
- 9. Overload Tests
- 10. Main Specifications
- 11. Conclusions