The solution is to get a graphics card with more VRAM or use another algorythm. DAIN uses A LOT of VRAM. They recommend at least 10GB for 720p interpolating. If it's linear with number of pixels, 4GB should be enough for DVD 16:9 max (ie 853x480) and 2GB for ~ 610 * 343 resolution (if it's 16:9)