Is my Tesla R2 500W PSU -12V rail failing?

I purchased a Tesla R2 500W PSU for my recent PC overhual (11 years overdue) and although my computer isn't giving me any serious issues, any software I run to keep an eye on things reports back to me that the -12V rail is actually sitting at -5.67V. Now I'll admit I don't know a lot about this sort of thing, but I believe that this reading is WAY out of tolerance for a PSU. Right? Even if it isn't causing me immediate issues, I would still like to be confident that my PSU is working 100%, in case I decide to make modifications in the future.

I don't own any multimeters so I haven't gotten around to taking a physical reading of said rail. Ideas or recommendations? Please note this issue exists with or without any overclocking and/or BIOs update.

My build is:
i5-6500
Hyper 212 EVO 120mm cooling fan
GIGABYTE GA-Z170-HD3P LGA 1151 Z170 ATX Motherboard
2 x 8GB DDR4 2400
GIGABYTE GeForce GT 740 2GB 128-Bit GDDR5 PCIe 3.0 x16 Video Card (OEM OC'd)
WD Blue 1TB SATA HDD 7200RPM
SAMSUNG 850 EVO 2.5" 250GB SATA SSD (Boot drive)
Tesla R2 500W PSU

<3
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  1. http://www.tomshardware.co.uk/forum/id-2547993/psu-tier-list.html

    You are risking an awful lot of $ worth of hardware on that power supply.
    Replace it immediately with a tier 2 or higher unit from this list.
    Aim for 550 watts for sensible graphics card upgrade options if you are a serious gamer.
  2. It was $40 and it's (supposedly) 80+ gold certified. I'm trying to be cheap while at the same time trying to achieve reasonable efficiency. Other than it being 50watts shy of being future-proof, why should I replace it entirely?

    I checked out your PSU tier list and many of the problems with the PSUs listed are extremely vague. The matching list of recommended PSUs is insanely limited. The list says this particular PSU has bad caps, thin wires, and no protection. I looked all this up and the caps are decent (Teapo brand is ok, the few CapXon caps are solid, not electrolytic, so those are fine), the wires are fine (no article even mentions the wires, pics reveal nothing unusual), and there most certainly is protection (some articles insist there is too much protection). Many articles even compliment the design and manufacturing of this PSU.

    So I ask, WHY replace this PSU? Some actual reasons would be great. None of this "X brand makes me feel Y" rubbish. Is it normal for the -12v rail to be sitting at -5.67v?
  3. Don't listen to the software, software readings can't be trusted. And gold certifications means absolutely nothing about a power supply's quality.
  4. I've contacted the manufacturer and explained everything, they offered to replace it. I'll record what each voltage reading is on this PSU and compare it all to the replacement. (I'll post the results if anybody is interested.)

    I tried looking up exactly what is using the -12v, and it's just one blue wire going to the motherboard, in the 24-pin connection. Testing that wire in particular, using a multimeter, doesn't sound fun. Does anybody have an idea exactly what is being powered by that wire? Is that wire even being used at all?
  5. Just an update, if anybody cares:

    The replacement PSU is showing the exact same values as before, indicating the software reading must be at fault. The manufacturer was quick in replacing it, however the replacement unit I received had minor scratches on it- clearly a messy refurb.

    I guess everything was fine after-all. Technology has come so far, yet can't do something as simple as a voltage reading. What a time to be alive.
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