I just did this a few weeks back to an old 5,1 I had lying around.

https://www.amazon.com/gp/product/B07FN3YZ8P/ref=ppx_yo_dt_b_asin_title_o05_s01?ie=UTF8&psc=1

with

https://www.amazon.com/gp/product/B07BN217QG/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1

Boot raw from a "Install Mojave" USB stick. I'm using a Radeon HD 7950 though so that may make things different.

Here is the disk speed :: https://i.imgur.com/KjPVdFO.png