How to calculate server for VDI?

Question

AutoCAD

From heavy software - autocad for working with two-dimensional graphics: master plans, diagrams, etc.
10 designers + 5-10 office machines with Word, Excel, yes 1st
If with the calculation of the disk subsystem, memory, and graphics it is more or less clear to me, then I have big doubts about the CPU.
According to the information that I found - for such a virtual machine park with such software, 2x E5xxx xeons with 4 cores / 8 threads will be quite enough. This makes me surprised and distrustful - will they really be enough for a dozen acads?
Further. Is it possible for a VDI organization to manage only with free software (minus licenses for windows), in particular for thin clients, which are ordinary PCs? Or will it be a decision and the category "you can use it, but it does not deliver pleasure"?

Answer 1

What's the budget?
It is necessary to formulate two desktop templates:
- standard (2 vCPU, 4 Gb RAM, 10 IOPS), consolidation ratio 1:8
- graphic. (4 vCPU, 8 or 16 Gb RAM, 20 IOPS, 1+ Gb VideoRAM), consolidation ratio 1:4
and select hardware and software considering:
- CPU: 2.7+ GHz per 1 physical core
- N+ availability mode 1
- 20% stock
Pro software:
- VMware Horizon
- Citrix XenDesktop
- MS VDI (NVIDIA vGPU issues)
- OpenSource...
Thin Clients:
- Dell Wyse
- HP
- TONK
- old PC with bootable flash drive running software: Thinstation or Stratodesk No Touch Desktop
- an old PC with Win and installed VDI Client (if you purchased Software Assurance or an enterprise Agreement, then you do not need to buy a MS VDA subscription).
Users will use a roaming profile, there are options for this: MS Roaming Profile, VMware Persona Management, Citrix Profile Manager. profiles will lie on a highly accessible network share and be backed up.