Thank you very much for your suggestions. I upgraded to :
Ryzen 5 5600X - 6 core, 12 thread
32GB DDR4
Asus Prime B550M-K motherboard
Samsung 980 2TB M.2 SSD
Radeon HD5450 2GB
Upgraded power supply to handle the chip power plug
The AMD 5600X doesn't work with the onboard gfx chips (even with
the latest bios update) so I went ahead and upgraded to the HD5450,
which works very well, driving two displays.
I don't game so this was a pretty cheap investment into a serious
upgrade to my ~10 year old box. :^)
Plus the new Asus motherboard boots UEFI very nicely (turns out
the old Gigabyte did not, even though it claimed to do so).
Now all of the drives I built to boot UEFI a couple of years ago
now can boot, though my UEFI raid drives get pushed to the front
somehow and I haven't determined how to specify the SSD. I have to
boot -a and select the correct dk. None of the "NAME=" stuff seems
to work and even specifying the boot dev listed (and specified to
be the boot drive) works. I can only specify which one (other than
RAID0) using the boot -a method.
Anyway, thanks very much for your help and I really liike the new
hardware.