I have a 1050 ti (which doesn't need an external power connector) and am currently using a thermaltake litepower 450
https://www.avadirect.com/Litepower-LTP-450NL2NK-450W-No-Modular-ATX-Power-Supply/Product/10544678
and i'm not sure if it has the external power connectors for a 1660 super. from a prebuilt and don't know much about which connectors go where.
https://www.avadirect.com/Litepower-LTP-450NL2NK-450W-No-Modular-ATX-Power-Supply/Product/10544678
and i'm not sure if it has the external power connectors for a 1660 super. from a prebuilt and don't know much about which connectors go where.