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Differences Between Seasonic FP+ and Prime?

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post #1 of 40 (permalink) Old 01-30-2019, 12:59 PM - Thread Starter
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Differences Between Seasonic FP+ and Prime?

I'm looking to replace my aging Corsair HX650 (80+ gold version) with the 650W Focus Plus or Prime Platinum.

Are there any noteworthy differences other than the warranty and efficiency rating?
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post #2 of 40 (permalink) Old 01-30-2019, 01:26 PM
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the Prime series (including their latest state of the art fanless 600W titanium) have a design flaw they have bad transient response (which in some cases can even trigger a protection shutdown)

conversely the Focus series has *relatively* good transient response (minor rails still problematic but nowhere near as bad as the 12V rail on the Prime series, also minor rails are minor importance)
the Focus still has - like the Prime - great voltage regulation & ripple suppression BUT unlike the Primes it suffers from dangerously high inrush current (at least on 220V) and - for some reason - dangerously high thresholds for overpower and/or overcurrent protection (bad design choice go figure)

overall Focus is still better cause transient response is important especially on the big 12V rail


ps. and if you wondering about Corsair: while modern high end Corsair don't have the above mentioned flaws of the Prime & Focus seasonics, they do have one YUGE flaw: they overheat so you better avoid those at least the RM & HX models

Last edited by pulverizor; 01-30-2019 at 01:36 PM.
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post #3 of 40 (permalink) Old 01-30-2019, 01:40 PM
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The Focus is the one with all the problems is it not? sure its the Prime and not the Foucs?
As for Corsair the newest RMx is not bad but i do agree that they are too focused on being quiet and they therefore get hot

The EVGA G3 has a noise problem when used in eco mode so pick your poison
https://www.overclock.net/forum/31-p...e-problem.html

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post #4 of 40 (permalink) Old 01-30-2019, 01:53 PM
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Focus has more minor problems but Prime has 1 yuge problem (bad transient response on 12V rail)

if it HAS to be Corsair then at least a RMi model cause it has a fan test button (and fan can be controlled by software) - and put it in a case where the PSU is at the bottom not top of case

EVGA makes comparable quality & performance PSU's it's basically the 3rd big competitor (though Antec made a comeback recently cause they had their PSU's manufactured by Seasonic)

but problem with EVGA is false publicity: they claim the PSU's are 100% japanese caps but sometimes that's a lie & there are non-japanese caps (even chinese ones) so till they fix that they should be boycotted
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post #5 of 40 (permalink) Old 01-30-2019, 01:56 PM - Thread Starter
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I've been running two Focus Plus units in other machines without any issue for several months now. Is the design really as problematic as it sounds?

It'll be another year before my HX650 runs out of warranty (Nov. 2020) so I guess I'll wait it out a while longer.
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post #6 of 40 (permalink) Old 01-30-2019, 02:00 PM
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Quote: Originally Posted by Shardnax View Post
I've been running two Focus Plus units in other machines without any issue for several months now. Is the design really as problematic as it sounds?
Quote: Originally Posted by pulverizor View Post
Focus has more minor problems but Prime has 1 yuge problem
(that said both are still good overall)
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post #7 of 40 (permalink) Old 01-30-2019, 02:07 PM
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Do you have a testing source for these claims?

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post #8 of 40 (permalink) Old 01-30-2019, 02:11 PM
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web reviews
eg. tom's hardware or jonnyguru
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post #9 of 40 (permalink) Old 01-30-2019, 02:26 PM
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The Foucs had problems with the Asus GTX 970 Strix and the Vega 56 and 64 cards thats all i have heard and seen
Have not seen or heard anything about the Prime so a source for that data would be nice

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post #10 of 40 (permalink) Old 01-30-2019, 02:40 PM
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tough luck jonnyguru website is down :/
one of the reviewers there had a good test for the prime ultra especially for transient response

this is the link check it out when site's back online

http://www.jonnyguru.com/modules.php...tory4&reid=544

you'll notice the nasty spike on the 12V tests (but at least there the PSU didn't shutdown)
and that's the best Prime of all time
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