Corsair RM850 2021 Version

[Mista G]

I've recently picked up this unit out of recommendations and all is well however, I can't seem to find any reviews on it or who it's made by other than Corsair branding. Any ideas?

[Guest]

RM, not RMx, right?

 

Pretty much the same thing.   Just lower hold up time (smaller bulk caps) and different PFC MOSFETs.  Fan is different.  The new RMx uses the ML fan while the RM uses the tried and true Hong Hua rifle bearing fan.

 

Ironically, the RM is actually much quieter at full load than the RMx.  This is because the fan blade design of the ML is not as good for static pressure as the HH fan and the larger hub diameter means you have smaller fan blades.

 

COMPONENT	RM850x	RM850
AC ON/OFF Switch	R9D8KKFT00F2-HL 250V/16A	Same
Input Fuse	215 OR 221Sereies 250V/12A	Same
AC Bridge Rectifier	GBU1506,15A/600V	Same
Inrush Thermistor	SCK15037MGY003 7A/3Ω	Same
Inrush Bypass Diode	1N5406 600V/3A	Same
Relay	OJE-SS-112HMF 250V 10A	Same
Bulk Capacitor	470uF+470uF 400V	390uF+390uF 400V
PFC Controller IC	CM6500UNXIS	Same
PFC Magnetic Core	QPR33	Same
PFC Mosfet	SiHA25N60EFL	IPA60R125P6
PFC Rectifier	C3D08060A	Same
PFC Capacitor	105K	Same
PWM Main Transformer	PQ3535	Same
PWM Controller IC	CM6901XIS	CU6901V(NEW)

 

 

[Mista G]

@jonnyGURU it's the RM version. Thanks for the detailed response.

 

Also, no cable capacitors was a bonus.

 

Is it a CWT?

[Guest]

2 hours ago, Mista G said:

@jonnyGURU it's the RM version. Thanks for the detailed response.

 

Also, no cable capacitors was a bonus.

 

Is it a CWT?

Yep.  Also CWT. Literally the same PCB as an RMx.

 

And yes... no cable caps is a plus. 

 

[Mista G]

@jonnyGURU are the Corsair Type 4 Gen 4 PSU Black Sleeved Cable Starter Kit compatible with this unit?

[Dogzilla07]

On 1/26/2022 at 9:23 PM, jonnyGURU said:

Ironically, the RM is actually much quieter at full load than the RMx.  This is because the fan blade design of the ML is not as good for static pressure as the HH fan and the larger hub diameter means you have smaller fan blades.

Do you prefer the 140mm Hong Hua to the older NR135L as well, or ?

[Guest]

5 hours ago, Dogzilla07 said:

Do you prefer the 140mm Hong Hua to the older NR135L as well, or ?

The NR135 and the 140mm HH have the exact same impeller design.  6 of one, half a dozen of the other.  The difference between "135mm" and "140mm" is just the bolt pattern that mounts the fan to the housing.

8 hours ago, Mista G said:

@jonnyGURU are the Corsair Type 4 Gen 4 PSU Black Sleeved Cable Starter Kit compatible with this unit?

Yes.

[Mista G]

@jonnyGURU The RM850 has now replaced my 3 month old Phanteks AMP 750W unit that recently developed a nasty fan rattle and an unusual coil whine sound.

 

I believe Phanteks is using the Seasonic GX as OEM? Currently still awaiting a replacement RMA from the manufacture however this will now end up on the bay at some point in the near future. I've had the RM850 for a few weeks now and glad to report it's a solid unit overall, no fan rattle or coil whine to report.