The 1650 is not a significant upgrade over the RX 560. It only has 896 CUDA cores, so it doesn't have any extra cores (not that you can compare directly, but it would need more to reach 100+% faster). I don't know if Topaz is faster on CUDA, it was CUDA originally so the 1650 might offer a more significant boost than expected, but in general a 1650 is only a bit faster than a RX 560.
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