Rule of thumb for audio is still GHz before cores.
The 1.8GHz machine is a lower powered laptop aimed at social media use. Kind of early 2000's spec there. Definitely the quad 2.8 vs that. However, if budget is a concern, you can find 2.2 - 3.6GHz quad core i7 machines from up to 7 years ago on the used market. Sometimes the price is less than half vs a new lower powered machine. Pretty easy math there.
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