Compatibility G5 Dual 2.7/powercore Pci/uad1 ? Options

[superlead]

HI,
i'd like to know if powercore pci 's (1st generation) coupled with an uad1 would work in a G5 dual 2.7 with some motu pci audio cards and logic pro 7.
i read i have to update the PCI424 to PCIX 424 for my 1296 and 2408mk3 but if i do upgrade to pcix, will the powercore pci's 1st generation and uad-1 work perfectly with LOCIC PRO 7.1 or 7.2 in the G5 dual 2.7 PCIX ?

also, will most of the plug ins and virtual instruments work with this setup ?

i read on TC's website that all PCI G5 are not working properly with more than 1 powercore pci card or with one coupled with an uad-1 , although they do work with multiple powercore PCI MK2 or firewire.
they also say that the G5 PCI X dual 2.7 is working with multiple powercore , whatever they are.