Question 1

Should I buy the Corsair HX850 or the Corsair RM850x (2024)?

Accepted Answer

Choose the HX850 when you want 850W capacity with 80 PLUS Platinum efficiency, a 10-year warranty, and a higher-end connector layout for a system with multiple CPU, PCIe, or storage connections. Choose the RM850x (2024) when native ATX 3.1 and PCIe 5.1 support, including a modern 12V-2x6 GPU connection, are more important than the HX850’s higher efficiency rating. The HX850 is a stronger fit for efficiency-focused builds; the RM850x is the more straightforward choice for a new build using a current-generation GPU power connector.

Question 2

Is the HX850 worth choosing over a Corsair RM750e for a gaming PC?

Accepted Answer

The HX850 is the better choice when the system has a high-power graphics card, a power-demanding processor, or planned upgrades that benefit from 100W of additional capacity and more load headroom. The RM750e is a better fit for a lower-power build because it provides 750W, fully modular cabling, ATX 3.1 compliance, and a native 12V-2x6 cable in a compact design. Choose the HX850 for higher sustained power requirements and Platinum efficiency; choose the RM750e when 750W is sufficient and modern GPU connectivity or smaller dimensions matter more.

Question 3

Do I need the HX1000i instead of the Corsair HX850?

Accepted Answer

Choose the HX1000i when the PC may require more than 850W, uses an especially power-hungry CPU and GPU combination, or benefits from ATX 3.1, PCIe 5.1, native 12V-2x6 support, and iCUE monitoring. The HX850 is sufficient for many single-GPU gaming and workstation systems when the estimated peak load remains comfortably below 850W. The upgrade to the HX1000i is mainly about additional power capacity, newer GPU power connectivity, and digital monitoring rather than a direct increase in gaming performance.

Question 4

Is the HX850 a meaningful upgrade over an older Corsair RM850x?

Accepted Answer

The HX850 is a meaningful upgrade when the older RM850x is being replaced for higher efficiency, a longer 10-year warranty, or additional connector capacity. It does not provide more nominal power because both models are rated at 850W, so expected system performance will usually remain similar if the older unit is healthy and adequately connected. For a new build with a current-generation GPU, compare the HX850 with an ATX 3.1 model such as the RM850x (2024), because newer connector support may be more important than moving from one reliable 850W unit to another.

Question 5

Will the CORSAIR HX850 fit in my PC case?

Accepted Answer

The HX850 uses a standard ATX power-supply form factor and measures 160 mm long, 150 mm wide, and 86 mm high. It should fit cases that support ATX PSUs up to at least 160 mm, but compact or prebuilt systems may use proprietary dimensions or connectors, so verify the case clearance and motherboard wiring before buying. ([bestbuy.com](https://www.bestbuy.com/site/questions/corsair-rmx-series-850w-atx12v-2-4-eps12v-2-92-80-plus-gold-modular-power-supply-white/6229601/question/77da857b-27b8-3c0c-8749-750814f88250?utm_source=openai))

Question 6

Is 850 watts enough for a gaming PC with a powerful graphics card?

Accepted Answer

The HX850 provides up to 850 W with up to 70.8 A on the 12 V rail, making it suitable for many single-GPU gaming systems. Actual suitability depends on the graphics card, processor, overclocking, and other components; check the GPU manufacturer's recommended PSU rating and connector requirements before purchase. ([bestbuy.com](https://www.bestbuy.com/site/questions/corsair-rmx-series-850w-atx12v-2-4-eps12v-2-92-80-plus-gold-modular-power-supply-black/6229601?page=2&pageSize=20&sku=6229601&sort=MOST_HELPFUL_ANSWERS&utm_source=openai))

Question 7

Does the HX850 include enough cables for a new PC build?

Accepted Answer

Yes. The HX850 includes the 24-pin motherboard cable, three 4+4-pin EPS/CPU cables, two PCIe cables with 6+2-pin connectors, SATA cables, and a PATA cable. Because the unit is fully modular, you connect only the cables required by your components. Do not reuse modular cables from another power supply unless they are explicitly confirmed to be compatible. ([bestbuy.com](https://www.bestbuy.com/site/questions/msi-mpg-a850gs-pcie5-850w-atx-3-1-pcie-5-1-ready-full-modular-80-plus-gold-gaming-power-supply-black/11066354?utm_source=openai))

Question 8

Will this power supply work with a newer graphics card that uses a 16-pin power connector?

Accepted Answer

The listed HX850 cable set includes conventional 6+2-pin PCIe cables but does not list a native 12VHPWR or 12V-2x6 cable. It may still work with a compatible manufacturer-approved adapter or cable, but confirm the exact graphics-card requirement and HX850 cable compatibility before buying. ([bestbuy.com](https://www.bestbuy.com/site/questions/nzxt-c-850w-atx-2-52-80-plus-gold-fully-modular-power-supply-black/6520668?utm_source=openai))

Question 9

Is the HX850 quiet enough for a low-noise PC?

Accepted Answer

It is designed for quiet operation: the 140 mm fluid dynamic bearing fan uses a controlled fan curve, and Zero RPM mode can stop the fan at low to medium loads. The fan may still run during sustained high-power gaming or heavy workloads, so noise depends on system power draw, case airflow, and ambient temperature.

Question 10

Is the CORSAIR HX850 suitable for a high-end gaming PC?

Accepted Answer

Yes, it is suitable for many high-end systems, including builds using GPUs such as the RTX 3080 or Radeon RX 7900 XTX, provided the total system power demand remains within the 850 W capacity. Confirm the GPU’s connector and recommended PSU requirements before purchase.

Question 11

Is the CORSAIR HX850 worth buying compared with other 850 W power supplies?

Accepted Answer

It can be worth buying when its price is competitive and you value a fully modular design, Platinum efficiency, and a premium component platform. Community discussions also note that lower-cost Gold-rated or other high-quality 850–1000 W units may provide similar practical performance, so the price premium should be considered.

Question 12

Is the CORSAIR HX850 quiet enough for a low-noise PC?

Accepted Answer

It is designed for quiet operation: the 140 mm fluid-dynamic-bearing fan can remain off at low to medium loads through Zero RPM mode, while the fan curve increases cooling at higher loads. Noise can still rise during sustained heavy workloads, so it is not guaranteed to be silent under full load.

Question 13

Does the CORSAIR HX850 make sense for a future GPU upgrade?

Accepted Answer

It may support a future upgrade if the new system’s power requirement remains appropriate for 850 W, but connector compatibility must be checked separately. The listed specifications provide standard PCIe 6+2-pin cables and do not list a native 12VHPWR or 12V-2x6 cable, so a compatible Corsair cable, adapter, or newer ATX 3.x PSU may be needed.

Question 14

Is the CORSAIR HX850 reliable enough for long-term use?

Accepted Answer

The HX850 has a strong long-term ownership record in community discussions, with users reporting many years of operation. However, isolated failures have also been reported, so reliability should not be treated as guaranteed; verify warranty coverage and avoid reusing modular cables unless they are confirmed compatible with the exact PSU model.

Brand	CORSAIR
Series	HX Series
Model	HX850

Type	ATX
Maximum Power	850 W
Fans	1 x 140 mm fluid dynamic bearing fan
Main Connector	24Pin
Max PSU Length	160 mm
Modular	Full Modular
Energy-Efficient	80 PLUS PLATINUM Certified
Input Voltage	100 - 240 V
Input Frequency Range	47 - 63 Hz
Input Current	10A-5A
Output	+3.3V@25A, +5V@25A, [email protected], [email protected], +5VSB@3A
Connectors	1 x ATX CABLE 24-PIN 3 x EPS/ATX12V CABLE 8-PIN (4+4) 2 x PCIe CABLE 8-PIN (6+2): 600mm, 150mm 2 x SATA CABLE (3 SATA - Right Angle):520mm, 115mm, 115mm 2 x SATA CABLE (4 SATA - Right Angle): 505mm, 115mm, 115mm, 115mm 1 x PATA CABLE (4-PIN):450mm, 100mm, 100mm,

Dimensions	6.30"x5.91"x3.39"
Weight	3.97 lbs

Meet Your Seller

CORSAIR HX850 Fully Modular Ultra-Low Noise ATX Power Supply - Triple EPS12V Connectors - Fluid Dynamic Bearing Fan - Zero RPM Fan Mode - 105°C Japanese Capacitors - 80 PLUS Platinum Efficiency

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Item#: 9SIC5BHKST3977