No, the publisher uses a non-graphical session of Creo and therefore will not use or leverage a graphics card at all. I have our CAD worker running on a Windows 7 VM with a mere 12 MB assigned to the virtual graphics card and it's working great.
Make sure you get a node locked license for your worker (either the free visualization license or some other license). This will allow you to run as many simultaneous Creo sessions as you want, as long as you give the worker sufficient resources. I'm running 15 sessions of Creo concurrently on one VM with one license and it's working great! There are some caveats to getting this working correctly though, so let me know if you need the details.