Quote - Macs have hardware gamma correction so they have no need for software gamma correction. NVidia cards have a "sort of" gamma correction because the card doesn't actually sync gamma with the monitor. 

No.  All modern video cards require Gamma Correction, because the monitor response is nonlinear.  

The purpose of gamma correction in Poser is to make lighting behave linearaly, as it does in the real world.  That is, if the the light intensity is doubled, what you see in the render output is doubled.  However the monitor response to the input signal is not a linear function, but a power function; the exponent for most monitors about 2.3.  That exponent is Gamma...

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