Sadly for these and my never crunched a work unit 4830, the current F@h minimum AMD/ATI GPU entry level is the 5000 series.
While the GPU2 client download page still lists 2xxx through 5xxx, a note on the V7 WinGuide page - http://folding.stanford.edu/English/WinGuide#ntoc4
- tells the sad story, "The end of support for ATI/AMD 4xxx series and below was announced in March 2011, and scheduled to end in September 2011. The last of the Fahcore_11 (GPU2) work units actually lasted until June 2012, more than a year after the original announcement."
There are currently a few charity Fahcore_11 work units to help nVidia GPU folders with G80-G92 low memory cards transition to a Fermi or Kepler card, however these work units could vanish at any time.