Hi Troy,
I am not aware of any user feedback regarding the usage of ramdisk, I also do not think we did any tests internally for that.
The hard drive has its biggest impact on step 3. DSM, Orthomosaic and Index. There are some improvements when passing from a standard hard drive to a SSD, so there might be improvements when using ramdisk. If you ever test it, please share your findings in the community.
Here is an article about processing speed that might help: https://support.pix4d.com/hc/en-us/articles/204191535
Regarding the hardware specs, I would recommend to read these two community posts on the subject:
- AMD Ryzen 7 computer for Pix4D
- Pix4D Computer hardware community benchmark