Is it possible to use an ac-dc converter to power a computer?

Question

Iron

There is a case for a streacom FC10 computer

and there is a 200 watt dc power supply for the Z2-ATX-200 motherboard, the

power supply needs 12 volts for input, although with a 12 volt power source it is more of a rectifier than a power supply, you also need 8 pins for the processor and 6 pins on the video card total about 400 watts.
Is it possible to use an ac-dc converter from 220 to 12 volts like this F05950 I
usually use this for led strips
I have doubts whether the adapter will output 12 volts at light load when the computer is idle? and are there any significant differences with a regular pc power supply?
At the expense of 3.3 5 volts, I don’t need them, since there will be nothing else besides the motherboard and video card. The hard drive is connected via an m.2 connector and is powered by the motherboard.
UPD
Case dimensions 435 x 319 x 100mm (W x D x H) i.e. a conventional power supply from 350 watts will not fit here.
The ac-dc converter has a knob for changing the voltage, for 12 volts it changes from 10 to 15 in 0.01 steps.
It seems that I figured out the output voltage on the site there is a value "current range" - the range, it is written that from 0 to 83 amperes. As I understand it, it works with the load range that is indicated in such a passport.
Space inside

with video card

Answer 1

What is the actual task? Power the motherboard in a super-duper cool silent case?
Then there can be no talk of any vidyuhi and 200 W of power for it - the case is low and closed, only integrated video is provided.
And powering the computer from the PSU for LEDs is somehow wrong. LEDs pofik ripple, and the computer will start to freeze or reboot at random times. Yes, there is a converter for 5V and 3.3V, and 12V go in transit. Glitches with a LED feeder are guaranteed.
Or spend money on a normal PSU recommended by the case manufacturer, or there is a 220V PSU of a different size - SFX or "Non-Standard" . Maybe something will fit?

Answer 2

Mean-well power supply manufacturer, power supplies are no different from a power supply unit for a PC. It's decided. The main thing is that there should be Power Factor Correction.

Answer 3

I use a 240W power supply for LED strips, for my streacom FC-8evo, no problems have been noticed for a year of operation.