crashing? i’d recommend you update to 5.3. it’s got a way more stable vram manager.
as for doing math: according to documentation a full blown 8kx8k terrain takes roughly a gigabyte of memory. out of my budget but it manages it. i dare to try brush something in the chunks. this geo is dense. i lagged in another demo project already.
a water plane should be cheap af. the only other factors you may have to deal with is shadow maps or vsm lod management. and ofc your foliage assets. you should run some memory diagnostic. figure out what’s blowing it up.
having tried it… 24 gigs should be enough for a humble and optimized terrain setup.