Radeon Pro Vega II Duo is much more powerful than a Radeon VII but that is only for applications that support multi GPU set-ups which Geekbench does not. This is why it performs slower than a Radeon VII because only one of the two Vega20 GPUs is used for benchmarking. Also, the GPU and VRAM clocks of the Pro Vega II cards are much lower due to the semi passive cooling.