That is it. No one has a tested card list and since HD2400 is hard to find and way too slow, most of SAM460 user like I, start with Radeon HD 4000
if you find HD2400 too slow and HD4000 then it is a bug in Radeon driver.
Newer gfx cards get better in 3D but since it is SAM460 it doesnt really matter.
@spirantho
You could file a report against yssing or just ignore it.