Given your father's requirements, why are you ordering a gaming GPU? Would not a Nvidia Quadro offer a better colour gamut? Full 10 bit colour, for instance. I would suggest you choose your GPU in concert with themonitors - there's no point getting a 10 bit GPU if the monitors aren't 10 bit.
And there's no point getting either if the software doesn't support it which sadly Lightroom doesn't yet do (I believe Photoshop does).
https://community.adobe.com/t5/ligh...for-use-of-a-wide-gamut-monitor/td-p/10306766
There is a comment early on in that link that says the banding issues that an 8-bit workflow can present tend not to be too noticeable in photography as there is naturally noise in a photo.
But overall the Cuda cores will be of more use than 10-bit colour at this point in time.