Yeah, people (including the idiots over at RedHat) still go by that old saw of "twice your RAM", which stopped making sense when Unix virtual memory implementations moved from swapping to paging. Which is to say, like 25 years ago.

My personal rule of thumb is: "how much memory are you going to use at once? Double it (because you'll underestimate) and make sure your RAM plus swap equals that." (Or, in less frugal times, buy that much RAM.) Regardless, that means the more RAM you have, the less swap you need, and vice versa, which is the exact opposite of that old wives' tale.