A:AnswerThose two alone will take up around 315 watts of your PSU so if you're not adding too much else it should be ok. Depending on how old your PSU is it may not even have enough cables to power to RX 6800 so make sure to do your homework.
A:AnswerYes. That should be more than enough. Look up the updated CyberPunk 2077 system requirements, most of the hardware can be supported by a wide range of CPUs. The 3600x is a very good CPU.
A:AnswerIf you are asking about the reference models, then nothing, But if you are talking about the custom model it will look different, and might have faster clock speeds.