What are the system hardware requirements for KAWPOW?
I found the following link:
https://cryptomining-blog.com/tag/kawpow-mining/
And then there are such things as "anti-mining" locks:
https://www.tomshardware.com/news/rtx-3060-still-profitable-mining
This GPU?
https://www.amazon.com/ZOTAC-GeForce-128-bit-Graphics-ZT-T16520F-10L/dp/B0881YZJ45
Recommended power supply is 350 watts.
However, even new it may be that the Antec PSU 450 watts is not enough to support peak system power demands. Especially if mining and/or overclocking.
As a result, the limit could be some throttling back to protect system components.
PSU quality (design, assembly, components) and how the 450 watt capability was actually determined/established both matter.
Use the following link to do some power calculations and do your own manual wattage total as well.
Best Power Supplies of 2021 - Top PSUs for Gaming PCs | Tom's Hardware
Overall, my thought is that your system may not be meet the full requirements for mining. Profitably or not.