Apple M3 vs the masses

My computer is ~4 years old. It has become slower (seeming at least) and the fan is randomly (always) very to (sometimes) VERY noisy. It's an ASUS brand with the following.
Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz 2.21 GHz,
12GB of unknown RAM,
unknown (256GB I think) storage.

I'm considering the new iMac with the M3 chip, 24GB RAM and 512GB SSD.

I'm wondering how much added horsepower I can expect with double the RAM, SSD instead of spinning HD, and that M3 chip. No, I don't need it but...

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