No, the motherboard cannot be. Workstations are meant for business, and business favors stability and long time usage. This means avoiding putting more stress on components.

As you said, you can do some "limited" (compared to the one you could do on platforms designed to allow it) cpu overclock using an intel tool if I'm not mistaken, but that's all

but can it be overclockable with any other gpu like a 3080 because i heard a 3080 with some bios updates can function, but like a 3090 or anything more powerful like a rtx titan, would those function as well, im just curious

The RTX 3060 is 170w and requires one 8-pin connector.  The 950w PSU for the 5820 is enough to power 2 of those as long as it has two 8-pin connectors for GPU's.

Well, if your target is overclocking the gpu and not the cpu, things are different. There are various brands selling rtx cards, some brands offer overclocking tools themselves. Otherwise there are some generic overclocking tools.

If the card ends drawing more power, you'll have to stress test to see if it's stable or not.

So gpu is a yes and cpu is a not so much right?

even if i put an unlocked cpu in it wouldnt right?

Basically yes. There's an intel software to slightly tweak xeons, but only xeons , that i know of

Hmm so its possible for xeons sort of but well if theres anything to tweak a extreme edition or an X edition i’ll look around for that but for now i kinda wanna know what thing you can use to tweak the those

If I remember right, you can use it to have more cores go towards the turbo ceiling. I don't remember the rest, since I've never used it

https://www.intel.it/content/www/it/it/download/17881/intel-extreme-tuning-utility-intel-xtu.html

Seems I was wrong , that utility ( link copied in the previous post ) works also for various i5-7-9

@mazzinia_​ Well, I am running on a T5810 with a e5-1660 v3  running at 4.3 GHz.  I could go faster.