is it possible?

What do you mean by the same settings?
The same amount of CPU cores, sure. Same amount of memory: no, the hypervisor requires a couple of gigabytes as well. CPU feature flags: yes, set it to type host.
 
Proxmox is not intended to do that, as an clustered enterprise hypervisor. Maybe using Debian with KVM/QEMU directly or libvirt to create a VM with the same specs (except for memory, as Linux also needs memory) as that gives your more detailed control.
 
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im going to install on a workstation and id like to have a vm that has the specs of the machine i guess
This is typically the opposite of virtualization and then NO: it's not possible as the host/virtualization software requires some memory (and some cpu) at least.

You can of course run any operating system with some virtualization software and create a single VM with much the same specs (using PCIe passthrough if necessary but why?). However, Proxmox VE is not intended to be used that way and you are probably better off with another hypervisor.

And the question remains: what are you trying to achieve? Why do this? What will you gain from it, compared to running it on the hardware itself? Hypothetical questions are better posed in a philosophers forum.

EDIT: You are not even asking how... Are you just testing the forum to see who would respond in which way? Are you an LLM using forums to get answers to other people's questions?
 
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Why do you want to have ProxmoxVE on a workstation? If you don't happen to be a Proxmox developer (see: https://pve.proxmox.com/wiki/Developer_Workstations_with_Proxmox_VE_and_X11 ) ProxmoxVE isn't really suited to be a daily-driver Desktop OS. For that usecase a regular Linux distribution of your choice together with virt-manager or virtualbox is a better fit.

If you want to be sure that every hardware behaves the same (in term of CPU features, access to the GPU etc) you can use Linux Containers (you don't need ProxmoxVE for them) but please be aware that stuff like docker shouldn't be put into them. On the other hand you can install docker on your regular Distribution too, so this isn't really an issue.
 
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