Overclocking the EVGA 760 on a 500w PSU

Steel_Nugget

Honorable
Dec 5, 2013
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The PSU is a OCZ 500w PSU
Other parts
I5 4440 stock cooler
8GB 1600mhz 4*2
3 120mm case fans
1 case light
1 1TB HDD

Just want to know how much room I have, the calculator says I have enough but I wanted to double check. Also I have another question, can a GPU manufacturer tell if you overclocked your GPU? Voltage, core clock, memory clock. I think they can only tell if you changed something in the BIOS. Do I have this right?
Thanks!