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TheGreyOne 10-27-2017 01:28 AM

Extreme (7+volt) voltage drops on +12v rail, bad GPU, PSU, Mobo or none of the above?
Hello folks; I was sent this way from Reddit, with the suggestion that you smart people might be able to help me troubleshoot my new PC somewhat. So... here's some backstory for you first:

I recently purchased myself a new machine, Ryzen 1700, X370 Taichi, G.Skill DDR [16gb rated @ 3200 CL14], Silverstone 1000w PSU and a Vega64.

Whenever it would spin up any intense gpu-usage situation I get some awesome (-ly bad) coil whine, and more recently I've been getting an increasing number of hard crashes.

I assumed it was a bad Vega, so I did the logical things; driver updates, driver downgrades, underclocked, stock clocked, etc... nothing. Eventually I retrieved my old R9 290 and swapped them out. It seemed better, but after a while it proved to be unsuccessful; the crashes & coil whine returned.

I was then suggested to use a tool called OCCT to 'test the power supply'; the outcome of that is a rather interesting discovery:

-- my +12v rail is seeing severe voltage drops of 7+ volts. My +5v rail was also seeing similar behaviour ("only" about 2.6 volts there though)

At this point I assumed, "nasty broken psu!" - disassembled my machine, swapped in my older one, and .... I'm back to crashing... no coil whine though! And, to top it all off, I am still seeing the +12v rail dropping to 5v whenever any real load is put on the machine.

I'm using HWiNFO64 to read all this data, but various other tools are pretty much giving me the same output [ie: whatever the motherboard tells them]. (In case it matters, I'm using Win10 x64 latest updates etc)

So... question now is; Are both my PSUs broken? Or is it both my GPUs? All four devices!?... Motherboard? ... something else ? -- I work from home, so down time without my machine is extremely not good, thus I'd like to find some sort of logic to what I should RMA if I'm forced to go that route. Or, if at all possible, some "go press X in bios and fix everything" suggestion (though obviously I'm not expecting that!)


awesomegamer919 10-27-2017 01:46 AM

What specific models of PSU are they?

TheGreyOne 10-27-2017 01:53 AM

New PSU: SilverStone Strider Platinum 1000W
Old PSU: ... I'll have to get back to you on that (it's a many year old 700w Cooler Master something-or-other...)

edit: RS-700-PCAA-E3 ( aka: CoolerMaster eXtreme Power Plus 700w )

-The_Mask- 10-27-2017 03:18 AM

Replacing your old PSU was a good choice. But why would you buy a 1000W PSU?

Anyhow it's not the power supply and you can't use software like OCCT for checking the power supply, just doesn't work.

Just test your CPU, memory and graphics card one by one with software first.

TheGreyOne 10-27-2017 03:27 AM

OCCT may not test the PSU directly, all it does it max out much of the CPU and GPU in "high power draw" usage. However; in this case it did reveal more details about the problems with my machine to me.

As for buying a 1000w psu, two reasons for that - I bought a Vega, and considered putting my 290 in the machine as well. Both cards are known to be 'thirsty'. If it ended up being excessive, then at worst I've wasted a little money?

-The_Mask- 10-27-2017 06:27 AM

Which details did it reveal then?

Wasting money/getting a worse PSU for the same price.

Orion 10-27-2017 09:19 AM

Just to be clear, your PSU doesn't actually drop from 12V to 5V and from 5V to 2.6V. It wouldn't even run if that were the case. The only thing OCCT told you is that its calculations (and/or your motherboard sensors) are ridiculously inaccurate.

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