To overclock the Gigabyte 1660 SUPER, I used MSI Afterburner. My best result came with +105MHz to the GPU core and +725MHz to the memory. Pushing the memory to +750MHz caused artifacting, and at +800MHz I saw system hard lock ups, so +725 was our best result.
Average clock speed under load
This overclock pushed our average frequency under load up to exactly 2070MHz, or another 123MHz versus stock behaviour.
Games
Across our 3DMark and games testing, this extra frequency resulted in 6-7% improved performance versus stock. This is decent but again, as we have seen from other Turing cards, nothing to get too excited about.