Your PC meets the minimum hardware requirements and is eligible for a free upgrade when deploying the new Windows. https://docs.microsoft.com/fr-fr/windows-hardware/design/minimum/supported/windows-11-supported-amd-....

Think carefully, before taking the risk, see the experiences of other users, see if it can be interesting, or if you can wait to have a new computer later, 100% compatible! Some indications can be changed, and some may not be useful to you, I can not always adapt the answer!]

Where to buy

There is something new, still a little confused, but it seems, that the requirements are still changed

Motherboard, this is the component that connects all the different parts of your computer. Often it has some integrated components like a sound card, enabling your computer to play sound, or a network card, to connect your computer to the network. https://blogs.windows.com/windows-insider/2021/06/28/update-on-windows-11-minimum-system-requirement... I read that it would be more or less possible to add a module, but nothing concrete, nothing found for the moment look at the bottom, where the TPM version is shown. If we see version 2.0, our computer should be compatible with Windows 11 in this section.

Memory (RAM), this is very fast memory in which temporary data is stored before being processed by the processor.