Wait? a 2060Super system consumes up to 333watts during stress (measured at wall socket, therefore, actually ~10% less than that.), WITH a 9900k CPU OC-d to all-core 5.0Ghz.
With a 2060, it will be less, with a 1200 it will be significantly less. 450w is fine. 450w is kind of plenty nowadays, and, you can still undervolt the card slightly (5-6%), which would also decrease temperatures and keep power consumption down by a few watts..