The last days I learned that the IBM PPC 970 is through its built in VMX absolutely code compatible to the G4 CPUs. So I was asking myselve why never any upgradecard with an G5 appeared for the G4s? Do you know about any special problems (aside the heat) of the G5s? some of the later G4 upgrades are datet 2006 or even 2007 if I am not wrong. A time when the G5 was already extensively in use. So why did non of the companies produce any G5 upgrades?
Even with clean 32 Bit usage, a 2,5 GHz 970 would be a great upgrade to an 1,4 GHz G4, ...
Any knowledge what might have been the issues for sonnettech, newer, fasc mac, powerlogix and others? I suspect that they avoided to use a G5 because they could never offer a true 64 Bit operation with such an upgrade. But as it is not needed for Mac OS 9 there would perhaps be a chance to create such a clean "built for Mac OS 9 upgradecard" these days?
Do you see any chance to produce such an upgrade today, and what would you expect, and what would it need to do for you, that you pay a lot for it these days?