Can the voltage setting of an overclocked cpu effect fps in games?
No. The CPU is either stable or it isn't. It does not work slower with less voltage as is implied by the other poster. That is just a falsehood. Nor does more voltage make it faster. Just adding voltage does nothing but add heat without a corresponding clock speed increase.
You want the
lowest possible stable voltage for any overclock which also seems to not be what the other poster implied. Lower voltage = less heat. Also voltage is a measure of force. Higher voltage than is necessary will cause excessive electromiration and wear out your part faster.
You didn't post what your system is or what temps you are getting for me to say if they are in line with what you should be seeing. Post more info and I can help more.
I'm unselecting that best answer just because most of what he posted is incorrect. If you feel it is the best answer please reselect it and I'll leave it alone.