The 5600G would be about $100 less, I think you mean the 5700G which is more comparable and right at that $50-60 mark. Unless you need the APU the 5800X stock is a better option. Higher clocks stock, PCIe 4.0, larger L3 cache. The 5700G can be an interesting option for overclocking though with the generally lower temperatures and better results I've seen with memory overclocking.
It's certainly an upgrade. It's really a question of what you're using the PC for and if you're going to get anything out of it. Anything CPU intensive where the extra cores will make a significant difference, it's worth it. If you're gaming, I probably wouldn't bother. Save the money for your next upgrade.
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