Performance, Value, Noise & Efficiency
The following graph shows the RM850x's total performance rating, comparing it to other units we have tested. To be more specific, the tested unit is shown as 100 percent, and every other unit's performance is shown relative to it.
Very good performance allows the RM850x to approach Corsair's higher-end HX850. The EVGA 850 G3 achieves a notably better score in this metric, but it loses big time when we compare noise output.
Performance Per Dollar
The following chart may be the most interesting to many of you because it depicts the unit's performance-per-dollar score. We looked up the current price of each PSU on popular online shops and used those prices and all relative performance numbers to calculate the index. If the specific unit wasn't available in the United States, we searched for it in popular European Union shops, converting the listed price to USD (without VAT). Note that all of the numbers in the following graph are normalized by the rated power of each PSU.
The white RM850x costs more because of its individually sleeved cables, and our performance-per-dollar calculation reflects this.
The graph below depicts the cooling fan's average noise over the PSU's operating range, with an ambient temperature between 30°C and 32°C (86°F to 89.6°F).
This is where the RM850x shows its strength. EVGA's 850 G3, its main competition, isn't available in all-white and is miles away when it comes to our noise measurements.
The following graph shows the PSU's average efficiency throughout its operating range, with an ambient temperature close to 30°C.
Efficiency-wise, this platform isn't among the best in its class (mostly because of lower efficiency levels under light loads).
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MORE:How We Test Power Supplies
The combes are also relatively poor quality and don't clip together brilliantly especially as there are multiples wires used in a couple of pins.
Is there a possibility to retest one of those Evga Supernova G2 units, like G2 750, in terms of the new hold-up time tests?
I read your Leadex Gold 550 review, where you find out the hold up time of that unit (and maybe the whole platform) is questionable and not really safe. So that made me think that the rest of the platform and also the Evga units are plagued by the same important mistake.
I own a G2 750 and after reading that review and some forum threads, I'm a bit worried now.
Hope you can help.
RMx have always been better than the G2 because they're quieter.
Thanks for the answer Aris,
Do you think that these units are safe though? G3 850 seems fine on your tests. Are there dramatic differences between G2 750/850 and G3 850 in terms of bulk caps etc...? You have a rough estimation maybe?
I looked into it before. The 650 G2 most likely has the problem where it drops the PWR_OK signal after the voltages go out of spec. The 550W should be fine. I'd assume the 750W is perfectly fine also. Not something to worry much about anyway.
Pretty sure those were some of the most unreliable units in history. RMA rates above 10% I believe.