> why not use a proper PCI-E card for SATA instead of a PCI card?

I guess because OS4 (or is Sam460's firmware the culprit here?) doesn't support a SATA card in the PCIe x1 slot.

> Makes me wonder why a MorphOS port was even considered.

Initial development of MorphOS for Sam460 was started in 2011.

>> Radeon 9250 is difficult to find, even I would like to stick it
>> next to my Radeon 6870HD on X1000 just to see some 3D.

> Acube sells [...] new Sam 460 systems with Radeon 9250 PCI! [...]
> Maybe you can ask them if they can sell you just the GFX card [...]?

The Sam460ex uses different PCI version with different voltage (3.3 V) than the X1000 (5 V). So caution is due.