I never used Sierra myself but I seems that 10.12 Sierra works with web drivers, just like 10.11 El Capitan. Check https://www.tonymacx86.com/nvidia-drivers/ for a list of the web driver kext so you can see if your web drivers are up to date with your OS (sub)version. And wait for any OS update until there is a web driver for it, else your card it won't work.
My advise is to keep the old 2600 XT handy for such cases.
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