I'm trying to connect a new monitor with a Display Port input to an older computer whose graphics card has an HDMI output. I bought an adapter but it doesn't work. I know you can do it the other way around--DP output to HDMI input--but am I attempting the impossible? Or do I have a faulty adapter or HDMI cable? I believe the graphics card is Nvidia GeForce 9800 GT, although it looks different from the picture I see online. It has three outputs, DVI, VGA and HDMI, while the one in the picture has two DVI outputs and one HDMI output.
The monitor works fine with the DVI connection, but am I missing a performance difference that makes troubleshooting and/or buying a newer graphics card worthwhile?