My XPS 435/9000 with an (i7 quad core processor 920) desktop originally came with an Nvidia Geforce GT220 GDDR3 graphics card. I have been having video issues so I just purchased an (PNY) Nvidia Geforce GT740 DDR3, thinking this card would be an upgrade. (I have an HP Pavilion 27xi monitor).
Maybe I was expecting too much, but to me it seems like the quality of the picture with the new card is not as good as the original card??? I swear I was getting 2560 x 1440 resolution originally, but I can only get 1920 x 1080 now? It says that is the "native resolution".
Thoughts? I don't game on my computer... mostly office stuff and videos etc...
Both cards are capable of higher resolutions, but your monitor is only a 1080p monitor so that is the max resolution. Its possible some settings like cleartype were reset when you swapped graphics cards as well. I would try adjusting them to see if that helps, even go so far as to download the latest NVIDIA drivers.
2560 x 1440 Digital is fine for DVI or Display port
HOWEVER 1920 x 1080 is the maximum you can do on VGA analog.