Cant use a 5900x AMD from Dell in another Motheboard?

BTW I entered my service tag and express service code, but it ended up like above....

Dell uses tray CPUs instead of retailed CPUs in their systems builds, the only different are customed coolers and backplate.  While Dell restrict some CPU performances in firmware BIOS lock, I do not think Dell actually locked their CPUs from working on retail boards.  

Thats what I thought. However, I tried 2 motherboards (MSI B550 Tomahawk and Asus Pro-Art B550) with various bios versions, ofcourse including the latest, with ram on the compatible list of those MB's and the red processor error light comes on immediatly. Tried to eliminate possible other component errors causing the red light by removing those components. No luck. To me it seems that the Dell 5900x is the only factor.....

Ow, if I reassemble the Dell, the 5900x lives again...

All the CPU's are the same between retail and OEM. I moved a 3700X over to a retail board without any issues.

If it does not work on a retail board, there will be a reason for it but the CPU being "OEM" will not be it.

@Vanadiel​  Sure there is no difference between tray and packaged CPU's.

But thats not what I think. I think the CPU may locked to Dell motherboards, which is possible to do. (It doesn't mean every Dell supplied CPU is) Like Lenovo.

https://www.startpage.com/do/dsearch?q=lenovo+locked+cpu&cat=web&language=english

Dell does it for Epyc CPU's, Lenovo does it for regular Ryzen as well.

https://www.servethehome.com/lenovo-vendor-locking-ryzen-cpus-with-amd-psb-the-video/

And this shows "it at work" if you replace the original (PSB enabled!) with a new one:

https://www.overclock.net/threads/can-a-prebuilt-amd-pc-be-processor-mobo-locked.1809469/

Your 3700X maybe has no blown fuses, so it works in any mobo, and I dont know if that CPU even has the possibilty to do so.

This is what you get if you install a "fresh" CPU on a Lenovo:

I don't know if there is something like that in an R10, but I have tried so many times now to get my 5900x working in two B550 motherboards with a few bios versiond for each, that this seems the only option left; my 5900x is locked to Dell mobo's. It doesn't mean every 5900x is locked, it also doesn't mean that there is something else wrong I haven't found out yet, but....

Oh, and why may have Dell done this? I bought the R10 duing the "extreme" chip shortage period, and maybe Dell wanted to discourage scrapers etc. Maybe they did it for a while, or maybe they didn't at all. 

Try to find this out from Dell with a expired warranty and the first liners at support (at a cost) :(

I just want to know, so I can finish my "new" system without more costly trail and error purchases...

Not regular Ryzen, they lock the Ryzen Pro CPU's and the Epyc/thread ripper ones. They are locked to the UEFI environment and cannot be used without secure boot feature because of that.

To my knowledge PSB technology is not available on AM4 CPU's outside the Pro/Thread ripper.

It would be highly controversial to do so, as that would create a massive amount of E-waste under the guise of "security".

I see. Anyways, I didn't get the Dell CPU to work on other mobo's, whatever I tried. I read others were able to, but not me. Tired of trying and spending money. So I put the Dell back together again, and back to the vacuum cleaner. I have some parts I can use with other builds in the future. Also bought 64GB of ram for the new build, didn't think it would work in the Dell, but it did. CORSAIR CMK64GX4M2D3600C18 Ver 5.42 2x 32GB. XMP profile 1.

Thanks for listening Vanadiel.