its still worth getting a new computer anyway. sure you can render it stems, but with a more powerful pc, you wouldn't have to render stems, and you would still be able to edit it, and you have to go back and make new stem if you wanted to change something. Rendering to stems is a temporary fix, but its not permanent, and its not idea. Save like 600 dollars and you will be able to build a decent pc for music production, it makes a world of difference.