I am building a miro-itx slimline pc for my mobile home that is powered by solar. I have selected a GPU with a rated TDP of 120 Watts and a CPU with a TDP of 53 Watts.I purchased a DC-DC buck converter ATX power supply the M4-ATX 250w rated for 12A continuous on the 12V rail. I made the incorrect assumption that the CPU was powered by an onboard buck converter working on the +3.3V rail( would make more sense? It's rated @ 25A), and thus the CPU load would count towards the maximum. After a little research it would appear the CPU buck converter draws from the 12V rail, pushing my power demands out of spec. I have thought of a few solutions and am curious as to their viability.
1.) Parallel another power supply onto the 12v Rail (Buck/Boost with Constant Current set to enough amps to bring the unit back into spec Constant Voltage mode set at higher voltage then my current 12V feedback locked DC-DC M4-ATX).
This would effectively make the Device constant current, and lock it to the regulated voltage.
2.) Parallel another M4-ATX onto the current one and hope that line regulation is sloppy enough to prevent short circuit-like feedback loop.
I would prefer #1 But I do not want any fried expensive electronics.
Thanks for reading through my word wall.