Thanks Calamity.
I'm not sure to follow you though. Do you mean that I can use only one of the outputs after I installed the CRT emudrivers and reboot? So then I don't have to worry? I can try directly with the VGA and if it's not the good one, nothing will happen so then I'll have to use the DVI and an adapter, no?
With my 4350 I was using the VGA directly. And in fact I forgot but recently I swapped a 4670 inside my mamebox so the one with the problem is a 4670 (Sapphire branded like the new one I ordered but a different model) and I used this one with VGA and at the end with HDMI too (on LCD only of course).