5V Rail Issues

fuzed

fuzed

fuzed

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Joined
16 Jul 2004
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145
I've got an old gigabyte ODIN PSU, and its worked great for years, but has been packed away for about a year or two now, I've just put together a new build and used the PSU - the setup is:

Gigabyte ODIN 850W PSU
AMD Ryzen 3700X
Gigabyte Arous Elite X570
32gb ram Corsair
MSI Vega 56 Airboost OC
1TB ssd (Samsung)
4TB hdd (wd red)
1.5TB hdd (seagate)

The issue I had was that any external USB hard drives would connect then disconnect, then connect and kept ongoing to the point where they wouldn't stay connected.

I initially thought I had a bad motherboard, so the MSI B450 Gaming Pro AC went back (a great board) and was working fine apart from this issue.

I have exactly the same issue with the Gigabyte board.

I've noticed the Bios and software CPUZ and similar apps telling me that the 5V rail is around 4.4Volts.

Is this the issue, and if so whats recommended as a replacement PSU to run that setup - I have a budget of around £100, less is better as the mrs will beat me as I've already spent loads on this build!!!!
 
I'm looking at the Seasonic Prime Snow Silent 650W 80+ Platinum PSU/Power Supply, which is £99 from another supplier at the moment, unless there is something better for less?
 
the Snow is out of stock at the moment, but the black version is in stock - will probably go with that one - unless there are any other suggestions at that price point, and will a 650W psu be enough for that setup? I won't be overclocking, I'll only be undervolting the Vega 56.
 
650w is more than enough for that build. One suggestion I would make though is to power the Vega from two seperate pci-e leads and not the pair of daisy chained pci-e connectors on a single lead. Several people have had stability problems powering Vega gpu's from a single lead which has been fixed by changing to two seperate leads.
 
Thanks, I'll do that, I'm hoping to have a nice stable setup once done. Next job is to get the card undervolted correctly.

pastymuncher said:
650w is more than enough for that build. One suggestion I would make though is to power the Vega from two seperate pci-e leads and not the pair of daisy chained pci-e connectors on a single lead. Several people have had stability problems powering Vega gpu's from a single lead which has been fixed by changing to two seperate leads.
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