PSU Voltage dropping randomly


Oct 11, 2012
Good Morning,

Pardon the newbish-ism of this post as I am new to this forum. I recently built the following system:

And after about a week of off and on play, I had a few hours to actually let the computer run up for several hours continuously. I noticed a couple of errors popping up for me by the Asus "Probe II" (voltage reader) saying that the 5V rail dropped down to 1.080 volts and the VCore dropping down to 0.0V and the 12V dropping down to 5ish. Is this a case of a faulty PSU or something different?

Thankfully these never happened at the same time and these would last for maybe half a second or so and my computer would not re-boot, as i've seen on many of these posts about under-volting of a PSU.

Thanks in advance for your help

P.S. If the above link does not work, below is the plain text version:

PCPartPicker part list:
Price breakdown by merchant:

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($215.99 @ NCIX US)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($27.98 @ NCIX US)
Motherboard: Asus P8Z77-V PRO ATX LGA1155 Motherboard ($189.99 @ NCIX US)
Memory: Corsair Vengeance 16GB (2 x 8GB) DDR3-1600 Memory ($80.99 @ Amazon)
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($89.99 @ NCIX US)
Video Card: MSI GeForce GTX 660 Ti 2GB Video Card ($297.55 @ Newegg)
Case: NZXT Switch 810 (Black) ATX Full Tower Case ($169.99 @ Amazon)
Power Supply: Thermaltake Smart M 750W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($99.99 @ Amazon)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($15.99 @ SuperBiiz)
Total: $1188.46
(Prices include shipping, taxes, and discounts when available.)



Jun 1, 2010
thermaltake doesnt have the best record for reliability... could just be a faulty PSU. get a multimeter and check it for yourself, as it could also be that it is just a false error!


Jun 28, 2007
If you observe this with a multimeter go out immediately and buy a lottery ticket. In all probability these voltage drops (if they are real) are occurring too fast to be seen with a meter. If I were you I would seek out other users of the utility for guidance. You could also replace the PSU with a known good one and see if the drop outs persist.

Similar threads