Just curious KC, is it at work or do you use it for work at home? I did not think anyone used older machines for work or gaming anymore.
IMHO, buy the best graphics card for that era, it is a work P/C as you stated but since such a long time has elapsed since that P/C was top of the line, those cards should be dirt cheap nowadays.
I do things sensibly, if a car is more than 5 years old, I usually put aftermarket parts on it, but if it's less than 5 years old I use factory made parts only. Don't be spending a wad of cash just on an old system, especially if it's just for a game.
I wish my P/C had a video card installed when I went out and upgraded it recently, I'd give you the old one, but AMD is smart, they build M/boards with the graphics chip installed, I guess so you go out and buy another card later on, but I do not think it is a money scam, more like AMD knew graphics were going to be outpacing P/Cs, hence no need spending 400 bucks extra on a card that came with the P/C and one year later games and other apps come out that require more crunching power.