ofc, nothing happens if you don't have ram, same to anything inside a computer...
it doesn't matter if you have 2 Gb ram, 6, 8, or 16 Gb, if you're only playing Tibia and nothing else.. because more ram doesn't make your computer faster, it only make it can handle a bit more at same time...
so,, the part you mean "Ram is a big deal in a computer"... it's same to everything you find in a computer, try to run a computer without energy cable.. or without screen, or maybe without processor....