saimond -
Did you get this resolved?
I have an EVGA GeForce GT 630 1GB.
For lack of a better description it looks like 'color flashing', and the card come back as 512GB.
It worked with the NVIDA Webdrivers under 10.10, and 10.12.6 works w/the default com.apple drivers, too.
If you found a...