We use a range of hardware depending on location, but our primary focus is on reliability and quality.
Mostly, our servers use Intel E3/E-2* series processors, depending on requirements. We do have some Ryzen based hosts - but only where ECC RAM is supported.
RAM and hard disk specs vary between host but we only use ECC RAM for our virtual machine hosts. The number of virtual machines per host is determined by specs of the server, but we will never oversell resources which are dedicated. We monitor our host servers load and will move clients/make changes as required where necessary.
We are more than happy to provide exact host specs for the server your virtual machine will be hosted on if required.