I have a 4,1 MacPro flashed to 5,1 with a 3680 Xeon processor, a SATA III pci card with Samsung SSD and a Geforce 980 videocard. I am still running High Sierra on HFS+.
I have read that the 142 firmware breaks my processor. That there are problems to flash the firmware to 141 if a PCI card is installed. I have considered to replace my Geforce by a Sapphire Pulse Radeon 580.
a) Will Apple use the destructive firmware update 142 in the upcoming 10.14.5 or 10.14.6?
b) is my OWC tempo pci-card compatible with the firmware update 141?
c) is the Radeon 580 at least as fast as the Geforce 980?
d) will the number of kernel panics increase after the update? (now my Mac is rock solid)
e) will the Mojave installer convert my HFS+ SSD to APFS or should I reinstall High Sierra on APFS first?
f) will booting be slower with APFS in Mojave than HFS+ in High Sierra?
g) I have a non retina display (Apple 23 inch). Is this a problem for reading text?
h) Is it possible to install Mojave while upgrading my High Sierra disk?
(If I have to install it on an erased SSD I won't be able to use my Adobe CS 6 anymore)
TIA