Corsair RMx Series 850 W (2021)

[crmaris]

The new Corsair RM850x uses topnotch parts, including Japanese caps and a magnetic levitation fan. It is also one of only two PSUs with three EPS connectors! The cherry on top is the high performance, among the best in this category, and the silent operation as long as you keep the load on the minor rails at normal levels.

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[shilka]

The lack of an on/off switch for the hybrid fan mode is still an an annoying oversight and almost everything else on the market has a switch so why cant CWT and Corsair have that?
Why does so many companies scew up the hybrid mode its either too relaxed like with the older RMx or way too aggressive like on the EVGA G3

This is why you should have a switch to turn it off give that way everyone have the option at least

 

[Deleted member 205776]

Cables still ugly as all hell, and probably awful to route (past RMx experiences). I much prefer the Seasonic stock cables.

 

[mechtech]

With inline cable capacitors, if the cap blows will you lose power or just an increase in ripple??

Cables still ugly as all hell, and probably awful to route (past RMx experiences). I much prefer the Seasonic stock cables.

I think all psu cables suck. They need to use more but smaller copper stands and EPDM jacket so they are really flexible.

I have 12/3 SOOW extension cable that’s more flexible than psu cables. Just sad.

Edit https://www.generalcable.com/assets.../cord-products/CAR_0143_17FREE_SOOW_SS_LR.pdf

 

[Deleted member 205776]

With inline cable capacitors, if the cap blows will you lose power or just an increase in ripple??


I think all psu cables suck. They need to use more but smaller copper stands and EPDM jacket so they are really flexible.

I have 12/3 SOOW extension cable that’s more flexible than psu cables. Just sad.

Edit https://www.generalcable.com/assets.../cord-products/CAR_0143_17FREE_SOOW_SS_LR.pdf

Out of all the PSUs I've worked with, when it comes to cable flexibility, RMx is the worst, Seasonic is fantastic, and Fractal Design ION+ is the best. Too bad the last PSU makes soda acid sounds.

I have a cramped case and my cable management in the back is trash, so being able to easily install a PSU automatically makes the cables great.

 

[juular]

With inline cable capacitors, if the cap blows will you lose power or just an increase in ripple??

The latter, they're parallel to the load (you can cut them off if you want to), not like you'll ever see an in-cable capacitor blow-up tho.

 

[Makaveli]

Can't go wrong with a Corsair PSU great quality.

My first one was a AX750 unit about 10 years ago and that is still running strong in a backup machine.

And I went with an AX850 Model for my AM4 build and it has a 10 year warranty and expect it to last like the last unit did for many years to come.

 

[Deleted member 205776]

Can't go wrong with a Corsair PSU great quality.

My first one was a AX750 unit about 10 years ago and that is still running strong in a backup machine.

And I went with an AX850 Model for my AM4 build and it has a 10 year warranty and expect it to last like the last unit did for many years to come.

As skeptical as I was about my CX 650, it was a reliable unit that served me well. Of course, it's now been replaced by a new king, the Seasonic Prime PX-750, but it is still a good backup PSU.

 

[Makaveli]

As skeptical as I was about my CX 650, it was a reliable unit that served me well. Of course, it's now been replaced by a new king, the Seasonic Prime PX-750, but it is still a good backup PSU.

Corsair and Seasonic are top of the stack if you ask me. Can't go wrong with either!

 

[Solid State Soul ( SSS )]

Too bad the last PSU makes soda acid sounds.

ION+ ?
That one has one of the best fans in the PSU market

 

[Deleted member 205776]

ION+ ?
That one has one of the best fans in the PSU market

I know, but my two replacements had the worst electrical noise ever, sounded like it was about to explode. Pour some Pepsi in a glass and listen to the acid. That's literally it.

My Seasonic makes no such sound, in fact, no sound at all.

 

[Solid State Soul ( SSS )]

Hell yeah man, the RMx 2018 is one of the top performers in the gold efficiency PSUs family, so glad to see Corsair and CWT updates an already top performing unit.

 

[DeathtoGnomes]

RMx is the worst, Seasonic is fantastic, and Fractal Design ION+ is the best.

who manufactures the ION+?

 

[Deleted member 205776]

who manufactures the ION+?

High Power. I'm talking in cable flexibility, not overall PSU quality. In terms of quality I'd take Seasonic Prime Ultra Plat (also known as PX) or higher.

 

[Solid State Soul ( SSS )]

who manufactures the ION+?

HEC, also known as High Power

 

[shilka]

HEC, also known as High Power

HEC and HighPower are not the same company you got them mixed up
HighPower is also known as Sirtec or Sirfa

HEC is also known as Cougar and as some other name with case i forgot

 

[Platinum certified Husky]

I find it amusing that someone high up in Corsair keep bashing Seasonic for using cheap fan controller in their PSUs, while most Corsair PSUs don't have a simple physical hybrid fan switch except AX series which is OEM by Seasonic.
And it is already 2021, why do Corsair have to cheap out on PCIE cables? Those split 6+2 pin cables look ugly and are super difficult to work with.

2021 version looks like a downgrade to me, it is significantly louder than 2018 version while the performance is almost the same as 2018 version.

 

[watzupken]

Man, when I see the PSU using the magnetic lev fans, I got worried. Having used a few of Corsair's ML fan series, they are terribly loud. The first time I used it, I thought someone switched on the vacuum cleaner. Turns out that the motherboard always start up with 100% fan speed which made the fans ran really loud. It was that annoying that I had to remove them for something cheaper but almost inaudible. From the review, it still seem like at high load, the noise level is very high still.

I find it amusing that someone high up in Corsair keep bashing Seasonic for using cheap fan controller in their PSUs, while most Corsair PSUs don't have a simple physical hybrid fan switch except AX series which is OEM by Seasonic.
And it is already 2021, why do Corsair have to cheap out on PCIE cables? Those split 6+2 pin cables look ugly and are super difficult to work with.

2021 version looks like a downgrade to me, it is significantly louder than 2018 version while the performance is almost the same as 2018 version.

I think people are not buying their ML fans because they are really loud, so Corsair may have decided to repurpose it. So here we have, 2021 Corsair RMx PSU.

 

[Arcdar]

Thanks for a very in-depth review with great pictures and content. You and Wizzard are masters of your craft

 

[juular]

I find it amusing that someone high up in Corsair keep bashing Seasonic for using cheap fan controller in their PSUs, while most Corsair PSUs don't have a simple physical hybrid fan switch except AX series which is OEM by Seasonic.

Personally i'd rather have an appropriate fan controller which translates in more quiet operation than to have a switch i'd have to flick whenever i find myself hearing a PSU when i should.

 

[TheLostSwede]

Man, when I see the PSU using the magnetic lev fans, I got worried. Having used a few of Corsair's ML fan series, they are terribly loud. The first time I used it, I thought someone switched on the vacuum cleaner. Turns out that the motherboard always start up with 100% fan speed which made the fans ran really loud. It was that annoying that I had to remove them for something cheaper but almost inaudible. From the review, it still seem like at high load, the noise level is very high still.


I think people are not buying their ML fans because they are really loud, so Corsair may have decided to repurpose it. So here we have, 2021 Corsair RMx PSU.

You need to learn to use fan curves in the UEFI. I have no such problem.

 

[Platinum certified Husky]

Personally i'd rather have an appropriate fan controller which translates in more quiet operation than to have a switch i'd have to flick whenever i find myself hearing a PSU when i should.

I mean it is a one time thing tho.
You want hybrid mode? then flick to hybrid mode, and forget about it. You want fan to run continuously? flick to normal mode and done.
Besides, start-stop cycles decrease fluid dynamic bearing's lifespan the most.

What I wanted to say is that Corsair themselves cheap out on things too, PCIE cables, hybrid mode switchs (you may not want it, but some people do)
It will be nice if they can stop being double standard.

 

[juular]

What I want to said is that Corsair themselves cheap out on things too, PCIE cables, hybrid mode switchs (you may not want it, but some people do)
It will be nice if they can stop being double standard.

They do have such feature on higher end PSUs, RM-i, HX-i, AX-i all permit editing of the fan curve through iCUE. Product segmentation ? Maybe, but RM-x is not exactly cheap PSU and adding a feature which will be used by 10% of users but will add cost for all is not exactly good thing. Seasonic can make that happen because they literally just have two PSU platforms so less money spend on tooling and they have higher margins to start with being OEM themselves (in addition to their PSUs not being exactly cheap either, PRIME especially). Other than that, what other PSUs have you seen having fan mode control button ? Can't think of anything from the top of my head but i think there were literally just one or two other.
Edit: and what's up with cables exactly ? They're not cheap just because Seasonic uses ribbon cables and Corsair doesn't. A matter of preference, no more. Speaking of which, i'd rather have ribbon cables too in exchange of not having in-cable capacitors, but if someone at Corsair thinks that having practically the best ripple supression in class is better - i'm fine with that, it's one time thing, install and forget.

 

[Platinum certified Husky]

it's one time thing, install and forget.

Except every time you look inside your case, you will see those ugly 6+2pin piggy tail.
Besides, aren't those piggy tail cables dangerous to be used on high power GPUs?

They are cheaper because Corsair can use less cables for same amount of PCIE connectors.

 

[Metroid]

I never had a problem with evga superflower psu's, corsair i had already 4 that have blown away and all of them are rmx series, although the warranty has always worked flawless, so i cant complain as long they replace it.