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Inrush current questions

  • Thread starter Thread starter Deleted member 205776
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Final attempt at getting a half decent PSU to replace my CX 650:

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What's the inrush current on this PSU like? The last PSU I tried, a Fractal Design ION+ 860P, tripped my circuit breaker after I plugged it into my 1500VA/900W Cyberpower UPS and turned on the PSU. Not sure why that was, I'm assuming inrush current?

Won't have any problems running this 750W PSU on this 1500VA/900W UPS correct? The exact UPS is CP1500EPFCLCD.

How flexible is the main ATX cable?
 
what is the ATX main cable? the 24 Pin you mean?

the cables for that model are pretty flat & flexible. i have several with the same wiring.
24pin cables are beefy & dont fex well. what i have been doing for decades is i pre-crimp the 24pin, so it has a 90Degree bend in it, to better accommodate installation.

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jboydgolfer said:
what is the ATX main cable? the 24 Pin you mean?
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Yeah, that. Having problems routing cables in this 500DX case. Bit too cramped. But this PSU is the exact same size as my CX 650 so I'm hoping it's a bit better in that regard.
 
Alexa said:
Yeah, that. Having problems routing cables in this 500DX case. Bit too cramped. But this PSU is the exact same size as my CX 650 so I'm hoping it's a bit better in that regard.
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ive found the Focus+ line to be better than the CX line, in every regard. im sure you will too, im also sure you wont go back to a cx once youve opened the Focus+

i personally dont use UPS units. i dont have a need, as i dont do work that cant be lost or easily replaced.
what is the reason you run a UPS?
 
jboydgolfer said:
ive found the Focus+ line to be better than the CX line, in every regard. im sure you will too, im also sure you wont go back to a cx once youve opened the Focus+
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It's not a Focus+, it's a Prime PX-750, the newer model https://seasonic.com/prime-px

Whether I go back or not depends if the cables are good enough to route around in my case.

jboydgolfer said:
i personally dont use UPS units. i dont have a need, as i dont do work that cant be lost or easily replaced.
what is the reason you run a UPS?
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To provide clean power to my PC and stabilized voltage (has AVR), and the ability to safely shut down my PC. The UPS also reduced coil whine noticeably, not sure how.
 
They arn't nice enough to always provide numbers for inrush current, in that case take a look at similar supplies in the same range and make a educated guess unless someone has actually tested that specific model, which I didn't find any of directly, but here is a few around that area

Seasonic Connect 750W Power Supply Review

The Seasonic Connect is a highly interesting project since it allows for much less trouble during cable management and on the same time offers high-performance levels.
www.tomshardware.com www.tomshardware.com
Apparently, 27 amps at 115v is considered rather low in terms of inrush current, heck if I know the difference. for 230v it was 85 amps.
 
I'd only trust values for my specific model, but 85A is the same or lower than my CX 650 anyway.
 
Alexa said:
It's not a Focus+, it's a Prime PX-750, the newer model
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same cables as focus+ platinum
if the CX cables worked, the seasonic ones will no doubt also work. the CX has fat braided cables, that are non modular. the seasonic has flat, modular cables
the 24pin is the only similar cable, & theyre pretty much the same on all PSU platforms, unless you can find some aftermarket alternative, or extension.
the rest of the Seasonic cables are thin, heres one from a platinum/titanium compared to a standard credit card
unnamed (1).jpg
Alexa said:
To provide clean power to my PC and stabilized voltage (has AVR), and the ability to safely shut down my PC. The UPS also reduced coil whine noticeably, not sure how.
Click to expand...
i guess i just havent encountered any of these effects
 
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Get some 90 degree adapters to help with cables, saves bending the wires everywhere and looks neat.
 
That's kind of bizarre if a single PSU can trigger circuit breakers. A kettle uses far more power than any computer, around 1500 watts or more I believe. Maybe the circuit powering the computer was only designed to handle a few light bulbs and basic appliances.
 
PooPipeBoy said:
That's kind of bizarre if a single PSU can trigger circuit breakers. A kettle uses far more power than any computer, around 1500 watts or more I believe. Maybe the circuit powering the computer was only designed to handle a few light bulbs and basic appliances.
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I'm not even sure if that's what happened, on my test bench, the UPS could handle the Ion+ 860P just fine. But when I connected it to my PC, plugged it into the UPS where my monitors are also plugged in, and switched the PSU on from the back, the power to my room went out and the UPS kicked in.
 
New PSU arrived. Cabling is nice, managed to install it in my case. Will post pictures later.

Important thing is -- no noise. Well there is noise but I really have to listen in order to hear it.

Everything works, no shutdown after I connected it to my UPS and tested it:

jLpjJdk.png


And the PSU was indeed as big as my CX 650. The packaging was smaller than I thought.

Time to fire up a game and see what happens.

EDIT: Okay well it sounds slightly like a tea kettle up close when I'm gaming but I'll live with it. No noises at all otherwise.
 
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Well I found out why I can't find any reviews of the PX-750:

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PX-750 is basically a Prime Ultra Platinum 750W, which has fantastic reviews (unit is the Titanium but it should be basically the same):

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Apologies for constantly updating this thread, but I feel like I'm making monumental progress considering my past months of dealing with bad PSUs.

I just figured out where the "teapot" noise I mentioned came from. The GPU. It's not high pitched, loud, or annoying, but it's there. I pointed the roll at the empty PCIe slots in the back, it was clearly audible, both the whine and the whistle.

I then pointed it to the PSU, nothing, save for some electromagnetic noises I heard when I was testing it outside the case which are very very quiet and inaudible unless you do as I did.

Incredible. This PSU never ceases to amaze me. Makes me wonder what the hell was wrong with that soda acid Ion+, even the replacement made the same noises.
 
Coil whine is a somewhat normal feature of GPUs. My 1660S does that too (but only when its under a specific load level).
 
all my graphics card just make wooshing noises with their fans
ive only ever heard coil wine out of dying psus
 
Selaya said:
Coil whine is a somewhat normal feature of GPUs. My 1660S does that too (but only when its under a specific load level).
Click to expand...
I know, I was expecting it to be from the PSU and I'm glad it's not. GPU coil whine I can live with
 
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