Yes, with regards to performance, AMD Radeon RX 7800 XT outperforms, Radeon RX 6500 XT by 298.9%.
The RX 7800 XT is more energy-efficient considering its peformance, consuming 263 watts to produce 3DMark score of 19839. By comparing its benchmark score to its power consumption, we get an efficiency score of 75.4. RX 6500 XT's efficiency score is 46.5, 62.3% lower, making RX 7800 XT the smarter choice in terms of power consumption.
When considering value for money, RX 7800 XT offers a better deal than, Radeon RX 6500 XT by 15.2%. Here is more in depth overview of the price and used prices of RX 7800 XT Price History and RX 6500 XT Price History