Your PC has BIOS that only goes up to v7.16 and to run a graphics card beyond the Nvidia GT(X) 6xx series, your PC needs to have a BIOS with a revision of 8.xx or higher.
So, you will need to install an older Nvidia GTX 6xx card for it to work.
You can look at this video where someone got a similar card to work in the Cupertino motherboard, but I don't think this procedure works for your model, and I think every time you fire up the PC, you have to go through this ritual.
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