[SUCCESS] Got through to the High Sierra desktop! Just about to use MultiBeast. Thanks! for all of your help. Will be posting a full account but there's not much to tell just started again with the standard install on a different USB stick (Kingston SE9) that didn't work so (no entry sign after Apple logo) then adjusted with OsxAptioFix2Drv-free2000.efi, and it just worked. Yipeee!!! I have a question about the BIOS though do you change the settings back to what they were or do you leave everything the same. How does this affect the windows partition? Thanks again
Hey
@SnakeP, that's great to hear. I'm super glad you got it working! The BIOS... I have left it the same, no idea if it will affect Windows- but I doubt any of the settings would cause it not to boot. Anyway, congrats!
Speaking of BIOS, I have been plugging away trying to find the right settings to OC to 5ghz, and I finally landed on something I like. My head is spinning from all of the youtube videos and forum research trying to figure this out (my first OC).
(stock, no OC was 160.5fps / 2051cb)
(stock, no OC was 6489 / 35247)
It is stable with anything I throw at it, with the exception of Prime95 (mac version). Temps are below 88C during Cinebench, and it stays below 70C during Geekbench (as reported by HWMonitor, at least). The main OC settings are Vcore at 1.375V (I guess I didn't exactly win the "silicon lottery" as they say). I had to enter the RAM settings in manually with no XMP because I think the profile was doing some odd stuff in the background with this motherboard which was causing instability.
I will write up all of the BIOS settings that I changed, I tried many things and most things failed stability tests. The temps are a bit high. Geekbench is showing 5% faster single core performance and 17% faster multicore, which will be helpful given that I use this machine mainly for multicore rendering.