What is your current CPU? If it's very old, you will not be able to fully utilize any upgraded GPU in Premiere Pro. In fact, even some much older generation GPUs that are still supported by Nvidia may be bottlenecked by such an old or weak CPU. That said, if you do go with an AMD GPU, then your system's performance will suffer on raw formats, and that the very latest AMD driver (both gaming and pro) has performance issues with GPU effects. Plus, the RX 7600 XT is actually a downgrade from your current RTX 3060 12 GB for Premiere Pro (though an upgrade for gaming) due to its much lower memory throughput (288 GB/s at 128 bits for the RX 7600 XT versus 360 GB/s at 192 bits for the RTX 3060 12 GB). And then there is the OpenCL API with its own performance issues. Worst of all, AMD has depreciated the OpenCL API itself in favor of something else that Adobe does not currently support for GPU acceleration, permanently restricting OpenCL to version 2.0 for its gaming GPUs or 2.1 for its professional GPUs. As such, the RX 7600 XT will only be a waste of money in your case, And if you have a newer-generation higher-end CPU, the RX 7600 XT will not perform well enough to justify its current street price. So much that the cheapest worthwhile AMD GPU upgrade from that RTX 3060 would be an RX 7800 XT, which is more expensive than the RX 7600 XT that you're considering.
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