I bought a new motherboard and it says it has USB 3.1 GEN 1 on the back panel. I did some research and apparently, USB 3.1 GEN 1 has the same power output as a USB 3.0 port which is 5V/1.8A. I thought of using it as a power source for 2 series of WS2812B LED strips for about 25~ LED's which should need 5V/1.5A overall.
So the main scheme would be like this, PC (USB 3.1 G1) > USB to DC > DC to Barrel > Strip (5V and GND pins)
Now, I'm not very experienced with electrics and power and don't want to fry a brand new motherboard/expensive led strip. Logically, I think this should be fine but again I'm not sure.