>>> There are Tabor users with GCN1 cards: [...]

>> R7 265, huh? If that works, then an R9 270 or 270X ought to work.

> It would be so great if the R9 270X would work! Then I could be lazy
> and wouldn't have to swap cards :)

If you read what Jim replied to, you can see that by "work" he didn't mean "work with MorphOS on Cyrus/X5000" but "work in Tabor/A1222 (and Sam460)".