Does the PSU CORSAIR 850W RM850x come with a fan control dial?

Yes, the PSU CORSAIR 850W RM850x comes with a fan speed adjustment knob.

How does the fan speed adjustment knob work? I have never seen a PSU with this feature. Although I haven't been PSU shopping in a good few years now.

With the knob 'off' the PSU will not use a fan on boot and the fan only kicks on when whatever smarts in the PSU determine it is necessary. I am not sure what the thermal limit is, but it won't turn on the fan until the PSU is quite warm. There is an audible 'click' when the relay turns the fan on at the thermal limit. Personally, I have set the PSU fan to a low level so the fan always runs even if no thermal limit has been tripped. There is no 'click' of the relay on since it is always on via the knob.

Does this power supply unit operate quietly?

So far mine has been really quiet.

Hi I am looking at the part number CP-9020270-NA CORSAIR RMx Series RM850x I noticed there is no -12 volt rail will this work with my motherboard MSI mpg z490 gaming edge WIFI?

go directly to corsair dot com to find your answer.

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CORSAIR RMx Series RM850x ATX Power Supply - Fully Modular - ATX 3.1 - PCIe 5.1 - Cybenetics Gold - Low-Noise - Japanese Capacitors - 850 Watts

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Options: ATX 3.1 80+ Gold (850W)

ATX 80+ Gold (650W)
ATX 3.1 80+ Gold (1000W)
ATX 3.1 80+ Gold (850W)
ATX 3.1 80+ Gold (750W)
ATX 3.0 80+ Gold (1200W)
ATX 3.0 80+ Gold (1200W) White
ATX 3.0 80+ Gold (1000W) White
ATX 3.0 80+ Gold (1000W)
ATX 3.0 80+ Gold (850W) White

Fully modular
Cybenetics Gold-certified
ATX 3.1 Compliant
Supports PCIe 5.1
Native 12V-2x6 connector
Ultra-flexible embossed cables with low-profile combs
Fan speed adjustment knob
100% Japanese 105°C-rated electrolytic capacitors
50°C Maximum operating temperature
Low-noise 140mm FDB fan
Zero RPM fan mode

🔥Don't forget your OS, we have Windows 11 OEM, Download and USB versions available

Specs

Reviews (975)

Learn more about the Corsair RM850x


Best Seller Ranking	#9 in Power Supplies

General
Brand	CORSAIR
Series	RMx Series
Model	RM850x
Part Number	CP-9020270-NA

Details
Color	Black
Type	ATX 3.1 Compatible
Maximum Power	850 W
Fans	1 x 140 mm
Main Connector	24Pin
Max PSU Length	160 mm
Modular	Full Modular
Energy-Efficient	Cybenetics Gold
Input Voltage	100 - 240 V
Input Frequency Range	47 - 63 Hz
Input Current	+3.3V@20A, +5V@20A, [email protected], +5Vsb@3A
Connectors	1 x 12VHPWR (12+4) PCIe / 1 x 24 pin ATX / 2 x 8 pin (4+4) EPS (CPU) / 3 x 8 pin (6+2) PCIe / 3 x PATA / 8 x SATA
Cable Spec	1 x ATX CABLE 24-PIN (24), 610mm +/- 10mm 2 x EPS/ATX12V CABLE 8-PIN (4+4), 750mm +/- 10mm 3 x PCIe CABLE 8-PIN (6+2), 650mm +/- 10mm 1 x PCIe CABLE 12+4-PIN(12+4), 650mm +/- 10mm 2 x SATA CABLE (4 SATA - (Straight angle)), 850mm +/- 10mm 1 x PATA CABLE (4-PIN), 750mm +/- 10mm

Package
Package Content	RM850x Power Supply \| DC Cable Kit \| Power Cord \| Mounting Screws \| Cable Ties

Additional Information
First Listed on Newegg	October 02, 2024

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Limited Warranty period (parts): 10 years
Limited Warranty period (labor): 10 years
Read full details

Return Policies

We want to ensure your holiday shopping this year is hassle-free. That’s why we’re automatically extending our return policies on almost every product! For purchases placed between November 1st, 2025 and December 31, 2025 you will have until January 31, 2026 to return your product.

Return for refund until: January 31, 2026

Return for replacement until: January 31, 2026

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CORSAIR RMx Series RM850x ATX Power Supply - Fully Modular - ATX 3.1 - PCIe 5.1 - Cybenetics Gold - Low-Noise - Japanese Capacitors - 850 Watts

Learn more about the Corsair RM850x

Customer Reviews of the Corsair RM850x

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info

Item#: N82E16817139333

CORSAIR RMx Series RM850x ATX Power Supply - Fully Modular - ATX 3.1 - PCIe 5.1 - Cybenetics Gold - Low-Noise - Japanese Capacitors - 850 Watts

Learn more about the Corsair RM850x

Customer Reviews of the Corsair RM850x

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info