You needn't go beyond 768 MB or possibly 1.5 GB with the page file. Microsoft says: "For best performance, do not set the initial size to less than the minimum recommended size under Total paging file size for all drives. The recommended size is equivalent to 1.5 times the RAM on your computer. It is good practice to leave the paging file at its recommended size. However, you may increase its size if you frequently use programs that use much memory." Then, neither the amount of RAM nor the speed of the CPU affect the quality of the render. RAM doesn't play any role in rendering except making it possible for you to open bigger files and/or to edit in them smoother. CPU speed is the only thing that affects the speed of rendering. Not quality, speed. The end result will always be the same, cause the processor will always calculate the same things. With a faster processor you'll "only" arrive to that result sooner.

-- erlik