EVGA 850 B3 PSU Review

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orionfotl

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There's a typo in the Final Analysis: "Although we're glad the 850 B3 didn't blow up like the 450W model, this is our second (so fat) B3-series power supply to die on the bench."
So fat.

Shame on the PSU.
 

Realist9

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Part of what I got from this review and the associated charts is that my next psu will likely be a Corsair unit.
 

dstarr3

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It seems like the general wisdom is still "Don't buy a PSU unless it has a 7- to 10-year warranty." The best products from the best OEMs always come with those warranties lately.
 

Aris_Mp

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If you ask me the warranty isn't an indication from the moments it is 5 years long. On the other hand when a company avoids sending some specific PSUs for review, then the whole thing looks suspicious.
 

dstarr3

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I don't necessary mean that longer warranty = better product. I just mean that there are some OEMs that are better than the rest, and their best PSUs are the best on the market, and all those best PSUs happen to have 7- to 10-year warranties on them. So if you see that warranty on a PSU right now, you can reasonably assume that it is one of the best models from one of the best OEMs.
 

Olle P

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I don't totally agree with the "Pros" and "Cons":
* Six 8-pin PCIe-connectors are supposed to be capable of delivering up to 900W. This PSU can't handle that.
* The efficiency is as advertised. That's neither a "Con" nor a "Pro". (In fact I'm impressed with the efficiency at 20W load. Expected worse.)
* Sleeve bearing is what makes the fan relatively quiet, so it's not a "Con" per se. Had it been a ball bearing fan you'd written "High noise level" as a "Con" instead.
 

Aris_Mp

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Efficiency is a con in general. It is low

If the fan had DBB and an optimal fan profile then it wouldn't be a con. A sleeve bearing fan in a 100 buck PSU doesn't look good and those type of bearings are suited for horizontal installation so they should normally be avoided in PSUs.
 

al3xand3r

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Hi Aris, congratulations for the wonderful review and all of your work.
I've seen all of your reviews, but one thing I do not understand compared to other review sites and that's related to the advanced transient tests. For example, the be quiet! Pure Power 10 600W PSU, in Advanced Transient Test at +12V, 20% - 20ms has a voltage drop of 0.211V. At 50% load 20 ms is a voltage drop of 0.222 volts. Instead, at [H]ardOCP, the same PSU records a 0.520 volt voltage drop at 20% load - 10 ms and 0.540 volts at 50% load – 10ms. And that's a huge difference. And I do not think this difference is because of the reduced time from 20ms to 10ms because at 1ms wich is tougher the drops it's not as high. What is wrong with [H]ardOCP methodology?
Is it possible that a quality PSU like this to have a voltage drop in load so high (0.52 Volts)? And that's just an example. At all the PSU’s I've seen on both sites are differences like this. Same as when you were doing only 50ms or 200ms. Is there any explanation for these figures that do not coincide?
Thank you
 

Aris_Mp

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Hi! It depends on various factors: slew rate (the higher the toughest the transient tests but the ATX spec sets a limit there), the measuring equipment and the loader of course. Personally I use Chroma loads with integrated transient capability so any lab can reproduce my results. Finally, I avoid judging the methodology that other sites follow. Everyone tries to do the best he can given the budget and the equipment that he has.
 

Olle P

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No it isn't! It's well above the 80+ Bronze limits, as advertised.
How many 850+W <$100 PSUs have considerably better efficiency (solid above 90%)?

Back in the days when the peak efficiency was around 70% you could argue about generally low efficiency. Not anymore!
 
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