> Cyrus was introduced [...] correcting X1000 [...] low CPU performance.

CPU performance comparison between QorIQ P3/P5 and PA6T, especially running under OS4, remains to be seen.

> Sadly its again two versions of Cyrus with CPU soldered instead of one board
> with changeable CPU.

It's 3 versions:
- X5000/40 with P5040
- X5000/20 with P5020
- X3500 with P3041

QorIQ chips come in BGA packages, so they must be soldered to the board. Only possibility to have them changeable would be by putting them on a CPU module such as COM Express.