PowerPC 750FX is a G5 IIRC so it's more a Morphos thing 
Kamelito
You're thinking 970. 750FX is a G3 and was used in the AmigaONE XE/G3.
The figure of 400 MIPS matches the specification for the RAD750 which is a radiation hardened version of the G3 rated at 200Mhz. It is used in other NASA projects such the Curiosity rover and would seem the obvious choice for a space craft.
On topic.
Has this card been tested with the various clockport adapters and cards with clockports out there. Could be useful if all your Zorro slots are full but you have a Budha or original X-Surf.