Evening, here is what I've just been told by the computer manufacture via their forums.
RX 550 2GB has 896 Shader Processing Units and isn't a 400-watt gpu...but typically no, you should not buy a gaming card with a 300-watt power supply Hope this helps.
Also, just so you know, the system includes an AMD ryzen5 prossesor, which uses 65watts plus the Radeon RX 550 which uses 50watts on a 300watt "power gaming" pc.
They lso tell me and I realize that they would not be in business if they create a or have not tested this computer thoroughly. I just find it hard to understand why AMD suggests a 400watt power supply for the RX 550 when the computer manufacture uses a 300watt power supply.
I'd really like to hear from an official AMD rep on this. So why list a video card with a "recommendation" of 400watts yet the computer manufacture uses a 300watt power supply instead.
Last bit of info here, yesterday evening, another Computer rep sent me more information is reference to my question. This tech rep says that because the mother board has been designed via the TDP process it can handle the RX 550 graphics card without an additional power outlet or power connector. If this all makes my sense.