Well, I'll be more than happy to test all four as soon as I get (or flash) a proper Radeon. I'm sure I've got at least two working ones (tested in PC), but they don't seem to work with my PCIe G5 @2,3 GHz. I guess it's flashing time (luckily nobody will tell me flashing is not supported, since nothing here is officialy supported anyway).

Of course I'll report back when/if I'm successful.