Some thoughts about this configuration:
- I assume you are aware of the fact that the free ESXi edition only supports up to 32GB memory!? If you have more physical memory in your host you need at least the Essentials Edition.
- the SSD for the OS is not required, because the Hypervisor runs in memory once loaded
- do you have a supported hardware RAID controller (if possible with battery/flash backed write-back cache)
André