Is DX12 faster on DX11-level hardware?

I have a DX11-level GPU but I have Windows 10 with DX12 installed. The question is: since DX12 provides lower-level programming interface, is it more efficient even on older hardware or there’s no difference? Has anyone tested this?

DX11 hardware runs DX12, that was one of the benefits. There’s no guarantee of performance improvement in what you’re doing though.