I thought ram helped in rendering times? I'm always hearing best cpu and as much ram as you can get was the way to go. Generally speaking. Which program used may have differences I suppose.
RAM only matters for
encoding (what many suites call "rendering" or "exporting") if you don't have enough of it and start swapping. Simple encoding does not take much memory at all, just enough to hold the current context. The bulk of the video file is being read in and written out to disk.
RAM is super important for
editing machines because most editing suites use a ton of memory. Encoding is certainly a part of editing, but it seems like that's not what the OP is having trouble with.