My system doesn't pass the Win 11 specs.
Secure Boot (I can change that)
TPM 2.0 not detected (don't think it's a problem)
CPU i5-4440 3.10ghz NOT SUPPORTED
Find an overview of Windows 11 specs and features from Microsoft. Learn about the device specifications, versions, and languages available for Windows 11
www.microsoft.com
This specification details the Intel processors that can be used with Windows 11 customer systems that include Windows products, including custom images.
docs.microsoft.com
This specification details the AMD processors that can be used with Windows 11 customer systems that include Windows products, including custom images.
docs.microsoft.com
All these guys are right. For intel, needs to be 8th gen or higher and a TPM 2.0 module or fTPM2.0.
For testing, I'm sure it'll be fine, but I would NEVER put a (Edit: Unsupported/underspecced/missing TPM2.0) client computer on Win11 without something signed saying they know that it could literally die tomorrow.
That said, there are a ton of ways already found to get Win11 on old hardware, and I can tell you 4th gen runs it just fine.
I will warn you; It isn't as "buttery smooth" as Microsoft makes it out to be. I have it on a laptop meant for it, and it is still weird, flaking, magical bugs, and the network stack is REALLY screwy if you need anything besides DHCP or simple static.
OH, and if you're on static and no gateway set (Or you set a gateway and it isn't present), you're not getting into the web panel of anything. Found this out trying to do some upkeep to some security system components and refrigeration monitoring systems. I literally have to pack a freaking pocket router with me since that's my field laptop just so I can connect to them.
And to top it off, we all know WHY. Look at Microsoft's Pluton CPU-embedded module... If they didn't enforce TPM2.0 or similar, I don't think their Pluton would fly. And there is still TONS of concerns around Pluton.