Need right (non-HP) Power Supply for HP Z420 workstation motherboard

Tom Skowyrski
Tom Skowyrski used Ask the Experts™
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I have Power Supply and Motherboard from HP Z420 workstation. I bought a case for it: Corsair 275R. The problem is that HP's PSU will not fit there at all and even if it did, the CPU cable would not reach the top of the motherboard where it is supposed to be plugged. So I have a new PSU: Corsair VS550. The problem is that ATX and CPU plugs are different on HP's power supply and Corsair's one. See attached pictures. Does it mean that HP is custom that I won't be able to get PSU for that motherboard or I can't use that specific Corsair I have and have to get something else? or am I missing something else?

Thx in advance
Corsair_ATX_plug.jpg
Corsair_CPU_plug.jpg
HP_ATX_plug.jpg
HP_CPU_plug.jpg
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Commented:
Very very custom PSU HP had made there. You're not missing anything.
I suggest you try to fit the PSU anyway in the case, even with glue (2 comp epoxy) if necessary, and extend the CPU plug with basic electricity cables, either crimped, or soldered (Assuming you like your case very much).
dbruntonQuid, Me Anxius Sum?  Illegitimi non carborundum.

Commented:
Short answer:

Not compatible.

Long answer:  See  https://h30434.www3.hp.com/t5/Business-PCs-Workstations-and-Point-of-Sale-Systems/HP-z420-motherboard-18-pin-layout/td-p/5835021

There is a link in there to an adapter which may or may NOT work.  Read the entire thread if you wish to go that way.

Also see this Amazon link  https://www.amazon.com/11-inch-24-Pin-18-Pin-Adapter-Workstation/dp/B071NL4VK2  if you want to buy American.

Author

Commented:
Would getting the extension for CPU 8 pin plug work?
https://www.amazon.co.uk/Akasa-AK-CBPW08-40BK-Flexa-ATX12V-Extension/dp/B004ZKXUS0/ref=sr_1_3?ie=UTF8&qid=1552295071&sr=8-3&keywords=cpu+8+pin+extension
I mean, I would have to cut to single individual pins/cables but this way I would have ready cables and no soldering or making up cables.

That fact that the adapter mentioned by you may or may not work is worrying. Also, I am planning to be leaving this pc on a lot of time and I'd rather go for safe solution, i.e. keep HP Power Supply.

I don't really mind the case but this is the second one I bought for it so don't really want to buy another one as I am sure Amazon will not take it as the box has been opened etc.

Another way, would be to follow you advice and stick power supply on top of the case - this way all cables would reach the connectors on the motherboard.
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Commented:
If it's stable on top of the case, and you don't mind the view, it's the best solution. The CPU 8 pin extend cable, is probably also not compatable, as your pictures already show, HP is not following the standards input (notice the squares, and the other "tunnel" like shape are in different places).

Author

Commented:
RE: "notice the squares, and the other "tunnel" like shape are in different places"
That is why i was thinking to cut it into 8 individual cables to match squares, and the other "tunnel" like shapes. That way, I could have PSU in the case. What do you think?

Commented:
You probably can't mix and match it like that, as HP made sure to make it as incompatible as possible.

Author

Commented:
Would you get that Chinese adapter yourself or would you stick PSU on top of the case? I would still have to cut a little bit out in the case to allow cables from the PSU to go in.

Commented:
My priority would be to use the original PSU, so that would leave my first suggestion or PSU on top of the case. Since you are not comfortable cutting the CPU plug and soldering 16 cables to extend it, that leaves only the PSU on top option.

Author

Commented:
Thank you. Going to screw it to the top of glue it there.

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