I have tested the AMD Radeon HD 7790 in my A1-X1000.
Test results:
- AmigaOS 4.1 doesn't boot
- Debian Sid works without 3D acceleration
- Lubuntu 14.04 boots and works without X11 (radeonsi driver doesn't load)
- Lubuntu 12.04.4 works without 3D acceleration
- Ubuntu 10.04.4 works without 3D acceleration
- SliTaz works with X11
- Fedora 17 works without 3D acceleration
- openSUSE 11.1 doesn't boot
- openSUSE 13.1 doesn't boot
The AMD Radeon HD 7790 is very quiet but it's not recommend to use this card with the A1-X1000 at this time.
Rgds,
Christian