I am a bit confused what exactly is decided by chosen output setting in DosBox. The thing is that only one i can make work correctly on my laptop (Intel video card) is DDraw. In Direct3d dosbox is adding tiny "letterbox" black stripes on th top and bottom of the scren (really small, about 2 mm height) although my screen vertical resolution is 768 and matches one set in dosbox. In any OpenGL mode the screen size is ok but i get horrible screan tearing. Is it caused by my Intel HD gpu and I am forced to use DDraw mode ony? Do I loose anything visually by using this mode or should the games look more or less the same as in other modes?

Thanks in advance for any suggestions.