I'm still using old hardware for rendering, I cannot render using my graphic card. I only have 4Gb of system ram. Right now blender say it just use about 4Gb while rendering, but in the task manager it is just 2Gb in use and 12Gb to 17Gb commited (blender is the only apps running).
How do I know how much system ram and video ram do I need to render similar scene, for guidance to buy newer hardwares and graphic card in the future?