Yes, with regards to performance, AMD Radeon RX 7800 XT outperforms, Radeon RX Vega 56 by 192.8% in 3Dmark benchmark.
The RX 7800 XT is more energy-efficient considering its performance, having power consumption of 263 watts and a 3DMark score of 19839. By comparing its benchmark score to its power consumption, we get an efficiency score of 75. RX Vega 56's efficiency score is 32 .So RX 7800 XT leads by 134.4%, making it the smarter choice in terms of power consumption.
When considering value for money, RX 7800 XT offers a better deal than, Radeon RX Vega 56 by 290.0%.