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I upgraded my GFX from GeForce GTX 560 to GTX 770. The system booted fine, drivers were installed, but after a while it rebooted. Just before the reboot, I also noticed my second (mechanical) HDD was no longer being recognized.

This looks to me like I don't have enough power, so I dug into the specs:

  • According to EVGA, I need 600W PSU with 42A on the +12V rail.
  • According to Chieftec, I have 4*18=72A on the +12V rail.

What seems to be the problem given the above? My guess is the PSU is broken and doesn't output enough power.

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You likely do have a power issue and will likely need a larger PSU:

Ohm's Law: V * A = W

  • Voltage x Amperage = Wattage
  • EVGA states a minimum of 42A on the 12V rail (504W) must be available
  • Cheiftec PSU is a 650W max PSU, leaving only 146W for the MB and all components
    • Cheiftec displays the maximum current that can be on any of it's power circuits at one time, not that that current is available across all circuits all the time.
    • Total output power cannot exceed 650W across all circuits:
      • 1x 3.3V Max (30A): 99W
      • 1x 5V Max (28A): 140W
      • 4x 12V Max (18A/per): 216W/per
      • 1x -12V Current (800mA): 9.6W
      • 1x 5V Standby (3A): 15W
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    After replacing the PSU the reboots are no more. Thanks for your helpful answer, from now on in addition to pure specs I'm going to take power balance into account.
    – Karol Jędrzejczyk
    Commented Jan 19, 2020 at 14:50

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