You will be just fine then.
And a dvi to vga adapter won't change your performance, as the only thing it does is to change the connector.
dvi-d is dual link dvi, and is used for high resolution dispalys, as they require more bandwidth to be able to have such a large picture, at an high refresh rate (a 1080p monitor will require dvi-d to run at 120hz).
dvi-i is analog dvi and uses the same signal as vga, so you can use an adaptor to change the connector to vga. The first dvi port on the graphics card is often the one you should use and it is often labelled on them.