2X SSAA without Buffered Rendering

[VIRGIN KLM]

There are other types of antialiasing though that could work without buffered rendering. Post processing is the cheap option but I remember reading about some other ones that aren't post processing and don't need importantly to be applied as SSAA or MSAA. The best thing you could do to simulate a 2x SSAA is to offer a menu for internal resolution and doubling the resolution of your screen, it should result into exactly the same result.