Ram is focused mainly on as someone pointed out loading things into memory. Also, it’s about textures. If you have a bunch of 4k textures, you’re going to reach your streaming pool size limit. A lot of people say more ram isn’t always better. While yes, that is true in some cases. 64-124 Gb of ram doesn’t hurt. There are QUIXEL game dev’s who max out their ram. It’s more though in good practice to optimize your texture sizes. For me, foliage isn’t something someone is going to crouch down and stare at, so I lower my foliage texture sizes. Optimize your game to focus on things the player is going to pay the most attention to.
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