No, in terms of performance, Nvidia GeForce GTX 980 Ti is slower than AMD Radeon RX Vega 56. AMD Radeon RX Vega 56 outperformes Nvidia GeForce GTX 980 Ti by 17.0% in 3Dmark benchmark.
When it comes to power efficiency, GTX 980 Ti falls behind with an efficiency score that is 23, lower than that of RX Vega 56 32. Consuming 210 watts, RX Vega 56 has 39.1% better power consumption to performance ratio. The efficiency score is calculated by comparing the benchmark score with power consumption
GTX 980 Ti price to performance rating is lower than RX Vega 56's. RX Vega 56 offers 42.9% better value fo money.