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Performance Rating
The new RM850x leads the category, in overall performance.
Noise Rating
The graph below depicts the cooling fan's average noise over the PSU's operating range, with an ambient temperature between 30 to 32 degrees Celsius (86 to 89.6 degrees Fahrenheit).
The difference in noise output compared to the previous model is notable. This has to do with the fan speed profile and the different fan.
Efficiency Rating
The following graph shows the PSU's average efficiency throughout its operating range with an ambient temperature close to 30 degrees Celsius.
The new platform is more efficient than the older one, but still there is room for improvement.
Power Factor Rating
The following graph shows the PSU's average power factor reading throughout its operating range with an ambient temperature close to 30 degrees Celsius.
The APFC converter achieves top performance with both 115V and 230V input.
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Current page: Performance, Noise, Efficiency and Power Factor
Prev Page Transient Response Tests, Timing Tests, Ripple Measurements and EMC Pre-Compliance Testing Next Page Bottom LineAris Mpitziopoulos is a contributing editor at Tom's Hardware, covering PSUs.
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Isokolon shame they changed the fan. the 2015 & 2018 RMx were so great for low-noise enthusiasts.Reply
how the review classifies an almost 30db unit as "quiet" is beyond me. -
Udyr What makes this unit better than the Toughpower GF1?Reply
https://www.tomshardware.com/reviews/thermaltake-toughpower-gf1-850w-power-supply -
jsz031 Hi Aris.. like your reviews..Reply
small question. I noticed the Bulk/hold up caps get higher with wattage. can you explain how this impacts a general PSU?
for example/off topic, I have a 5 year old 550w G2 and it has a 400v 470uf cap. Just purchased a 550w g3 and the cap is lower capacity @ 400v 390uf.
Does this mean anything or am I overthinking it? is the 550w g2 better than "base" spec? I understand leakage can occur over time, I'm just not sure if its a downgrade or upgrade in specific areas.
thank you. -
jayjr1105
As long as they are meeting the ATX spec of 17ms hold up time, it doesn't really matter. The G2 was probably overkill so they cut costs by going with a lower capacity one.jsz031 said:Hi Aris.. like your reviews..
small question. I noticed the Bulk/hold up caps get higher with wattage. can you explain how this impacts a general PSU?
for example/off topic, I have a 5 year old 550w G2 and it has a 400v 470uf cap. Just purchased a 550w g3 and the cap is lower capacity @ 400v 390uf.
Does this mean anything or am I overthinking it? is the 550w g2 better than "base" spec? I understand leakage can occur over time, I'm just not sure if its a downgrade or upgrade in specific areas.
thank you. -
tomkawal
..and worst quality coming from production line! Mine was covered with thick layer of metal salts from soldering. It stopped turning on. Works again after thorough cleanup.Admin said:The new Corsair RM850x is among the best PSUs in its category.
Corsair RM850x (2021) Power Supply Review : Read more -
tomkawal Beautifully presented. I was not so lucky with the unit I got, which stopped working after a month. Sent back to eBuyer guys and received it again not fixed (generally they requested ALL cables where I wanted only brick swap - this is totally unacceptable for me when the wires are in place tied to enclosure!) Raised ticket with Corsair with no answer in 2 days. Fixed on my own with one hour of cleaning the PCB from thick layer of soldering flux on the bottom side of PCB which caused leakage currents all over the board. Now it works. Horrendous experience and I don't recommend none of these businesses.Reply