You usually can literally use both at the same time. As in dual monitors. Just like people would run one AGP card and one PCI vid card before it became the norm for video cards to have dual outputs.
Looking at Newegg, there indeed are, although your choices are mainly limited to ATi, specifically the HD3000 series for the newest chips. From nVidia you only have the 7 series, which, while still decent, is already 2 generations old.
Just to let people know, he could have problems as the standard computer power supply has changed over the years. A new graphics card will need a 400W power supply but older computers may only be 330W (or if it's really old, 240W). I had the same problem a while back.
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