PSU with 9, 4-pin molex connectors?

Habakkuk · 22 Apr 2018 at 23:36

I'm looking for a power supply with the usual 20+4 motherboard connector and 9, 4-pin Molex connectors - which probably means at least semi-modular.

I don't need or want any other connectors.

I've been daisy-chaining extenders atm, and I've been dealing with power issues and restarts - I'm looking in the 650W range, no lower than 500W.

Habakkuk · 23 Apr 2018 at 11:38

Upgrading a 3D printer - it uses a standard ATX power supply, but adding a camera/reworking the power regulators/RGB lighting has overtaxed it's built-down-to-a-pricepoint PSU.

Habakkuk · 23 Apr 2018 at 11:39

I cannot overemphasise how bad this 8 year old power supply is.

Habakkuk · 23 Apr 2018 at 11:50

This no-name brand is light enough to balance on one finger.

I've hooked up a power supply tester and

There's no +12V2 line, so that will always show L.L

The -12V line keep jumping between ~10.8 and ~13.6 volts and hitting H.H.

Habakkuk · 23 Apr 2018 at 13:20

Oh geez I made the mistake of looking inside - I didn't know they actually got crusty.

It's the one the printer came with - replacing as part of a retrofit.

Habakkuk · 23 Apr 2018 at 17:22

Looking at the Corsair line - they all have 25A on the +5V - this crusty PSU claims 30A on +5V.

Infact, the only Corsair PSU I can find more than 25A on that line is the AX1200 with 30A also.

Increasing the wattage/cost of the PSU seems to only increase the +12V lines.

(assuming the crusty one is not straight-up lying about capabilities)

Habakkuk · 23 Apr 2018 at 18:43

Thankfully not - the 5V is just used for logic.

The 12V supply powers the stepper motors/heated bed/extruder heater - even the RGB lights are 12V.

Looking at this I should be able to get away with 500W if it's actually 500W and not just a sticker - even the CX500M has 38A on the 12V rail.

That's nearly double the 22A it's currently working with.

Habakkuk · 23 Apr 2018 at 22:54

I'll open it up after I've replaced it & check the replacement works

I'm looking forward to checking the soldering & the capacitor's voltage ratings.

Habakkuk · 24 Apr 2018 at 14:58

Nice read - there were a few PSU's there missing over voltage/current protection - I expect this one to miss the OVP with it hitting +13.6V and not shutting down.

If a capacitor has failed, it'd explain the widely varying +12V ouput - unless it's a particularly bad design from the start (all bets are off)