In a review by Expreview cited by TomsHardware comparing the GTX 1650 GDDR6 to the GDDR5 version:
The GTX 1650 Destroyer OC has a 1,485 MHz base clock and 1,665 MHz boost clock, while the GTX 1650 GDDR6 Destroyer OC has a 1,410 MHz base clock and 1,620 MHz boost clock. That's equivalent to a 5% reduction on the base clock and 2.7% on the boost clock.
The GTX 1650 GDDR6 delivered about 2-12.5% performance gains over the GDDR5 version, depending on the benchmark and game. Collectively, we're looking at an average performance increase of 6.4%, based on Expreview's results.