What are the symptoms of not enough power from your psu?

  justintime505 21:45 05 Nov 2014
Locked

I just upgraded my power supply and my graphics card and seem to be having some issues. The computer works fine during gaming but seems to run into some kind of issue while benchmarking. The computer does not turn off completely but the during the heavier benchmarks the monitor goes black and shuts off (the sound still plays though) I'm thinking this may have something to do with an insufficient power supply but I'm not sure. How would this problem manifest itself?

The rig:

GPU: Asus Geforce GTX 780ti DirectCU II OC

CPU: I7-4770 3.4ghz

Ram: 16gb

PSU: Corsair CX750

Have I underestimated my power needs? or do I possibly have a lemon

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