- ATX12V / EPS12V
- Full Modular
- 80 PLUS GOLD Certified
- 100 - 240 V 47 - 63 Hz
- +3.3V@25A, +5V@25A, +12V@54A, -12V@0.8A, +5VSB@3A
Proven stable with science
11/07/2015
This review is from: CORSAIR RMx Series RM650X 650W 80 PLUS GOLD Haswell Ready Full Modular ATX12V & EPS12V SLI and Crossfire Ready Power Supply
Pros:
As an engineer at a major semiconductor manufacturer, I was in an unusually good position to test this power supply's quality in detail.
A key mark of a good power supply is steady voltage as load changes.
We measured power with a very advanced oscilloscope capable of 5x the bandwidth required by the ATX specification and calibrated just 2 weeks earlier.
For each voltage, we took 2500 samples using a running PC as a real-world load. We ran a low load since many power supplies have a hard time not going over voltage specs.
Short version: The power supply design is very good. *Every* sample was within within +/- 5% of the base voltage. There wasn't a single spike in over 17,000 measurements!
See "Other thoughts" for more detailed data.
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During the test, the power supply was cool to the touch and entirely silent the whole time. The fan never turned on because it wasn't needed.
During an informal test on my own system -- a 6-core DDR4 machine overclocked to 4.3GHz, the fan activated at load but was too quiet to hear from 3ft away. I can use this to replace my fanless Rosewill Silent Night without increasing system noise significantly.
Cons:
Being a fully modular power supply (even the 24 pin motherboard connector, odd as that seems), the fit inside some cases is a little tight,. The plastic connectors stick out more than 1/2" past the power supply. In a cramped space, assume at least 1" of room past the power supply is needed when you add cable bend.
As with many high-end power supplies, this one ships with a fancy velvet carrying case. How often do you carry your power supply around at a party? It seems a silly trend and I hope it adds no more than 2 cents to the unit's cost.
Overall Review:
+3.4v:
Standard Deviation: 0.024329617
Max Voltage: 3.44
Min Voltage: 3.3
+5v:
Standard Deviation: 0.029969411
Max Voltage: 5.24
Min Voltage: 5
-12v (note that ATX allows +/- 10%, but this unit was still within 5%):
Standard Deviation: 0.057962843
Max Voltage: -12.16
Min Voltage: -12.56
+12v:
Standard Deviation: 0.033915673
Max Voltage: 12.48
Min Voltage: 12.16
Difference from ground (FYI):
Standard Deviation: 0.018717451
Max Voltage: 0.112
Min Voltage: -0.088
Full data and oscilloscope screen captures available upon request.
I can run a full analysis in JMP, but as you can see the voltage is very stable across all voltages.
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- Charles B.
-
EggXpert
-
Owned For:
1 week to 1 month
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