Faulty PSU help

So whenever I start Crysis, or attempt to change the settings in certain games, my newly built PC will crash and restart, with a Kernal-Power critical error in the Event Viewer. In other games, I will hear a high-pitched whining noise I have pinpointed from the PSU. It will change pitch and frequency depending on what I'm doing in the game. I'm fairly certain that the PSU shouldn't be making any such noise, and therefore the crashes are a result of a faulty PSU. However, I'd like to be sure that case isn't that the PSU is fine and there's another faulty component which is drawing power improperly causing the issue (i.e. the GPU, as this only happens in games). Thoughts? Should I RMA the PSU or is it possibly something else?
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More about faulty psu
  1. What kind of PSU is it?
  2. Also, what are the specs for this system? Especially need to know what make/model of GPU, PSU, CPU, motherboard are being used. Also, is anything overclocked (CPU, GPU, memory)?
  3. Here are the full specs. Nothing is overclocked yet.

    PCPartPicker part list / Price breakdown by merchant / Benchmarks

    CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor (Purchased For $239.90)
    Motherboard: Gigabyte GA-Z87X-UD4H ATX LGA1150 Motherboard (Purchased For $189.99)
    Memory: G.Skill Ripjaws Series 8GB (2 x 4GB) DDR3-1333 Memory (Purchased For $66.99)
    Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (Purchased For $69.99)
    Video Card: Gigabyte Radeon HD 7950 3GB Video Card (Purchased For $254.99)
    Wireless Network Adapter: TP-Link TL-WN851ND 802.11b/g/n PCI Wi-Fi Adapter (Purchased For $23.99)
    Case: Cooler Master CM 690 II (Black) ATX Mid Tower Case (Purchased For $89.99)
    Power Supply: EVGA SuperNOVA NEX750B BRONZE 750W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply (Purchased For $79.99)
    Optical Drive: Lite-On iHAS124-04 DVD/CD Writer (Purchased For $17.99)
    Other: XIGMATEK eXTREME SILENT Series XSF-F1252 120mm (Purchased For $12.99)
    Other: NZXT Sentry-2 5.25" Touch Screen Fan Controller (Purchased For $24.99)
  4. Best answer
    Tough one, that PSU should be fine. Could you test your system with another PSU?
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